Abstract and Figures

An updated checklist of the vascular plants of Annobón Island (Equatorial Guinea) is presented. Two hundred and ninety-five taxa of Angiosperms in 211 genera and 68 families and 51 species of Pteridophytes in 31 genera and 18 families are listed from Annobón. The most represented families are Leguminosae (38 taxa), Gramineae (29 taxa) and Orchidaceae (28 taxa). In addition bibliographic references have been collated and checked. Thirty-eight species are included based on records from the literature where their distribution ranges suggest they should occur on Annobón. Fifty-four introduced species that have become naturalized are listed. Twenty-four taxa are recorded for the first time, three of which were not previously known for Equatorial Guinea. Peperomia blanda is recorded as a new for West Tropical Africa. At present 23 taxa are known to be endemic to Annobón or to Annobón and the islands of São Tomé or/ and Príncipe. The percentage of endemic species is 7.8. The small area of Annobón and the strict application of conservation criteria indicated that every endemic of the island should be considered as threatened under IUCN guidelines. Species conservation assessments were undertaken for 23 taxa using IUCN criteria; 19 of these represent the first assessments for these species. The catalogue includes accepted names, synonyms and voucher specimens.
Content may be subject to copyright.
Accepted by Alex Monro: 31 Mar. 2013; published: 6 Jun. 2014
1
PHYTOTAXA
ISSN 1179-3155 (print edition)
ISSN
1179-3163
(online edition)
Copyright © 2014 Magnolia Press
Phytotaxa 171 (1): 001–078
www.mapress.com
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phytotaxa
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Monograph
http://dx.doi.org/10.11646/phytotaxa.171.1.1
PHYTOTAXA
Checklist of the Vascular Plants of Annobón
(Equatorial Guinea)
M. VELAYOS
1*
, P. BARBERÁ
1
, F.J. CABEZAS
1
, M. DE LA ESTRELLA
2
, M. FERO
3
& C. AEDO
1
1.
Real Jardín Botánico (CSIC), Plaza de Murillo 2, 28014 Madrid, Spain.
2
Facultad de Biología, Universidad de Córdoba, Celestino Mutis, Campus de Rabanales, 14071, Córdoba, Spain.
3
Universidad Nacional de Guinea Ecuatorial, Av. de Hassan II s.n., Malabo, Equatorial Guinea.
*author for correspondence: velayos@rjb.csic.es
Magnolia Press
Auckland, New Zealand
171
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Phytotaxa 171 (1) © 2014 Magnolia Press
Ve l ay o s et al.
Checklist of the Vascular Plants of Annobón (Equatorial Guinea)
(Phytotaxa 171)
78 pp.; 30 cm.
6 June 2014
ISBN 978-1-77557-415-6 (paperback)
ISBN 978-1-77557-416-3 (Online edition)
F
IRST
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UBLISHED I
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2014 B
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ISSN 1179-3155 (Print edition)
ISSN 1179-3163 (Online edition)
Phytotaxa 171 (1) © 2014 Magnolia Press
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CHECKLIST OF THE VASCULAR PLANTS OF ANNOBÓN
Contents
I. Abstract....................................................................................................................................................................................... 3
II. Introduction. .............................................................................................................................................................................. 3
III. Material and Methods. ............................................................................................................................................................. 9
IV. List of Vascular Plants............................................................................................................................................................ 10
A. Pteridophytes........................................................................................................................................................................... 10
B. Magnoliids............................................................................................................................................................................... 16
C. Monocots................................................................................................................................................................................. 17
D. Eudicots................................................................................................................................................................................... 25
E. Cultivated species.................................................................................................................................................................... 52
F. Doubtful or erroneus records. .................................................................................................................................................. 53
V. Floristic Analysis..................................................................................................................................................................... 53
VI. Acknowledgments ................................................................................................................................................................. 55
VII. References ............................................................................................................................................................................ 55
Index of scientific names ............................................................................................................................................................. 63
Appendix 1................................................................................................................................................................................... 75
Appendix 2................................................................................................................................................................................... 76
Appendix 3................................................................................................................................................................................... 77
I. Abstract
An updated checklist of the vascular plants of Annobón Island (Equatorial Guinea) is presented. Two hundred and
ninety-five taxa of Angiosperms in 211 genera and 68 families and 51 species of Pteridophytes in 31 genera and 18
families are listed from Annobón. The most represented families are Leguminosae (38 taxa), Gramineae (29 taxa) and
Orchidaceae (28 taxa). In addition bibliographic references have been collated and checked. Thirty-eight species are
included based on records from the literature where their distribution ranges suggest they should occur on Annobón.
Fifty-four introduced species that have become naturalized are listed. Twenty-four taxa are recorded for the first time,
three of which were not previously known for Equatorial Guinea. Peperomia blanda is recorded as a new for West
Tropical Africa. At present 23 taxa are known to be endemic to Annobón or to Annobón and the islands of São Tomé or/
and Príncipe. The percentage of endemic species is 7.8. The small area of Annobón and the strict application of
conservation criteria indicated that every endemic of the island should be considered as threatened under IUCN
guidelines. Species conservation assessments were undertaken for 23 taxa using IUCN criteria; 19 of these represent the
first assessments for these species. The catalogue includes accepted names, synonyms and voucher specimens.
Key words: biodiversity, Gulf of Guinea Islands, floristics, IUCN category
II. Introduction
Annobón is a small island of 17 km
2
situated near the Equator in the Gulf of Guinea. It is part of a volcanic
mountain range which includes Bioko, São Tomé and Príncipe. Of the four islands of the Gulf of Guinea, Annobón
is the smallest and farthest from the mainland (360 km from Gabon, and 190 km from São Tomé). Exell (1973:
327) referred to Annobón as an “almost oceanic island”. In contrast, he called São Tomé and Príncipe “maritime
islands” indicating that they did not meet the characteristics attributed to oceanic islands.
The island is composed of basaltic rocks. A map (Figure 1) shows three main elements: a) the crater occupied
by the lake A Pot (at 150 m the sea level) with several adventitious cones that reach even the 400 m crater in the SE
of Punta Manjob, b) Santa Mina Mountains up to 613 m, and c) a corridor from NE to SW which links the bays of
San Pedro and Santa Cruz, on the course of the river Anganchi (De Castro & De la Calle 1985: 67). In Annobón,
soils are of the same volcanic origin as those of Bioko but with lower silica and higher proportions of
ferromagnesian element making the soils ultrabasic (De Castro & De la Calle 1985: 67, Fa 1991: 22). Given its
small size there is no major river flow. Small permanent streams on the island are arranged radially from the higher
areas to the coast (Figures 1, 2). Lake A Pot occupies a volcanic crater of 700 m in diameter and about 150 m
elevation (Figure 3) (De Castro & De la Calle 1985: 17, Fa 1991: 22). Most of the coast is cliffs. No potential areas
for mangrove and few for dunes can be found. Annobón has a climate with an average temperature of 26.1° C with
VELAYOS ET AL.
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little annual variation and two distinct seasons caused by rainfall variation. No data are available about total
rainfall. The wet season runs from November to May. The drought is a period of intense monsoon dry season (De
Castro & de la Calle 1985: 69, Fa 1991: 22).
FIGURE 1. Map of Annobón Island. Numbers on the map correspond to the main collection localities, which are indicated in
Appendix 1.
The first and only permanent town on the island is San Antonio de Palé or Ambo, with about 5000 inhabitants.
It is located in the north, in the most fertile plain of the island. The remaining villages (Santa Cruz or Aual in the
west, San Pedro or Anganchi in the east and Mábana in the south) are temporarily occupied in the dry season or
holiday months (June to late August–September). Communication between Palé and the villages is made by
winding paths along the island or by canoe (cayucos), built with trunks of Ceiba pentandra (Linnaeus 1753: 511)
Gaertner (1971: 244).
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CHECKLIST OF THE VASCULAR PLANTS OF ANNOBÓN
FIGURE 2. West coast of Annobón Island, between arroyo Jada and Santa Cruz (Aual).
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FIGURE 3. Crater lake of Annobón Island, seen from south slope of pico do Fogo.
FIGURE 4. Asplenium annobonensis Mildbr. ex Viane (based on Ve l a y os e t a l . 11604, MA). Endemic to Annobón.
Phytotaxa 171 (1) © 2014 Magnolia Press
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CHECKLIST OF THE VASCULAR PLANTS OF ANNOBÓN
Annobón has suffered and currently continues to suffer high anthropic influence. The expansion of the airport and
seaport in the north of the island around Palé, has increased communication with the rest of Equatorial Guinea. The
construction of this infrastructure has resulted in great environmental impact, including several quarries. The main
farms for the subsistence of the inhabitants of the island were located in this territory. Nowadays there are “fincas”
everywhere on the island, even in steeply sloping locations. These are mainly for the production of yuca [Manihot
esculenta (Crantz 1766: 167)], banana, malanga [Xanthosoma violaceum (Schott 1853: 370)]. Some of the fincas have
been abandoned and the crops like cacao [Theobroma cacao (Linnaeus 1753: 782)] have become naturalized. This
type of agriculture together with artisanal fishing represent the food base of the population of the island.
The oldest collections in the island are probably those of Andrew B. Curror who, at some time between 1839
and 1843 was in Annobón collecting at least two species, Begonia annobonensis (Candolle 1859: 127) and
Vernonia amygdalina (Delile 1826: 41). His collections are now at K (Exell 1944). Between 1861 and 1864,
Richard Burton, the British Consul in Bioko collected on the island and his collections are also at K. Francisco
Newton stayed on the island from November 1892 to January 1893. His collections are at LISU and were studied
by Sobrinho (1953). Probably the largest collection from Annobón was by Johannes Gottfried Willhelm Mildbraed
under the auspices of the Deutsche Afrika-Expedition-Zentral 1910–1911 in 1911. Mildbraed's collections were
mainly kept at B but were destroyed during World War II. There are, however, duplicates at HBG, K and BM.
Mildbraed's results were first published by himself (1922: 146–164) and later collected in Catalogue of the vascular
plants of São Tomé (with Príncipe and Annobón) (Exell 1944). Exell collected in Annobón in 1933 resulting in ca
forty specimens which are currently at BM.
Thomas Christopher Wrigley and Fenella Ann Melville worked on the Cambridge Expedition to Fernando Po
and Annobón in July and August 1959 together with Julio Álvarez, a Spanish zoologist. They collected 316 numbers
which are at K, with duplicates at BM, BR, MPU, MA. This collection was identified and published by Exell (1963).
Bernard Descoings collected 233 numbers in 1964 that are deposited at MPU. Manuel Fidalgo do Carvalho collected
113 numbers between September and October 1987 that are at MA.In October 2000 a multidisciplinary expedition of
researchers from Equatorial Guinea, Great Britain and Spain worked in Annobón. Botanical collections were made
by Crisantos Obama and Angus Gascoigne and are housed at LISC. Further references on collectors of Annobón
Island can be found in Velayos & Aedo (2001: 26–49) and Figueredo et al. (2009: 213).
FIGURE 5. Discoclaoxylon pubescens (Pax & K. Hoffm.) Exell (based on Velayos et al. 11648, MA). Endemic to Annobón.
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FIGURE 6. Turraea glomeruliflora Harms (based on Velayos et al. 11664, MA). Endemic to Annobón.
FIGURE 7. Cassipourea annobonensis Mildbr. (based on Fero et al. 228, MA). Endemic to Annobón.
Phytotaxa 171 (1) © 2014 Magnolia Press
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CHECKLIST OF THE VASCULAR PLANTS OF ANNOBÓN
In 2010 and 2011 a group of botanists of Real Jardín Botánico Madrid and Universidad Nacional de Guinea
Ecuatorial, collected the island exhaustively. The expedition composed Carlos Aedo, Patricia Barberá, Francisco
Cabezas, Manuel de la Estrella, Maximiliano Fero and Mauricio Velayos. They collected 337 specimens deposited
at MA.
The aim of this study is to update and to complete the catalogue of the plants of Annobón based on vouchers in
the reference-herbaria for the Flora of Equatorial Guinea, together with those plants collected as part of more recent
expeditions. Additionally we would like to contribute to assesing the conservation status of the endemic species
(Figures 4–7) from Annobón.
III. Material and methods
The checklist is primarily based on herbarium specimens. We studied 737 specimens collected in Annobón from
BM, BRLU, HBG, K, LISC, LISU and MA, including most of the historic collections. For comparative purposes
specimes from São Tomé & Príncipe and other territories of Equatorial Guinea kept in those herbaria were also
considered.
Bibliographic references for all groups were also checked. Most of them against the project Flora de Guinea
Ecuatorial (Aedo et al. 1999) bibliography.
The checklist is arranged in four natural groups: Pteridophytes, Magnoliids, Monocotyledons and
Eudicotyledons. Within each group, families, genera and species are arranged alphabetically. Family classification
follows Christenhusz et al. (2011) for Pteridophytes and APGIII (Reveal & Chase 2011) for angiosperms. When a
discrepance with the classification of Flora de Guinea Ecuatorial (Velayos et al. 2008) is found it is indicated in
brackets. Authors of plants names are abbreviated according to Brummit & Powell (1992), and to the updated
version of “Authors of plant names” available at http://www.ipni.org/ipni/query_author.html.
Under each accepted name a list of all the studied specimens is included. Previous bibliographic records from
the most relevant literature are also included. When the taxon was recorded under a synonym, this name is
mentioned after each report, as follows: Mildbraed [1922: 160, sub Gleichenia linearis (Burm.f.) C.B. Clarke].
Cultivated species as well as doubtful and erroneous records are listed at the end of the catalogue. They are not
included in the floristic analyses carried out.
A map (Figure 1) and a list with collection localities of Annobón with geographic coordinates is included in
Appendix 1.
The conservation status of threatened species is assessed using the IUCN criteria (IUCN, 2012). Annobón area is
quite small (17 km
2
), therefore all endemics should be considered directly as threatened species under status
Vulnerable according criterion D (VU D2). If strict application is made of the IUCN assessments, those endemic
taxa not collected recently should be classed as Critically Endangered and tagged as Possibly Extinct, but we rather
prefer a precautionary approach to the criteria A and B, in order to describe more accurately the level of threat with
the quality and number of data we currently have. Since direct observation revealed the irreversible effect of human
influence in the island by the great increase of infrastructures as the construction of a new seaport or the extension
of the existing airport, we consider criteria A2 as the best descriptor of the real situation. Under A2 we apply the
last collection date, recorded from herbarium specimens studied, as indicator of percentage of population
reduction. Criterion B has been used as descriptor of global distribution of the species and to precise of the species
observed situation.
In sum, we consider to be: i) Critically Endangered those strict Annobón endemics (Appendix 2) that meet
both following criteria: A2 (The taxon has not been collected in the last 50 years, so we assume that population size
has been reducted more of 80 % over the last 10 years or three generations); B2 (Area of occupancy estimated to be
less than 10 km
2
); ii) Endangered those strict Annobón endemics that meet both following criteria: A2 (The taxon
has been recently collected but due to their fragile habitata and small populations we assume a size reduction of ≥
50% over the last 10 years or three generations); B2 (Area of occupancy estimated to be less than 500 km
2
); and iii)
Vulnerable those endemics species shared with São Tomé and Príncipe that meet the following criterion: D2
(Population with a very restricted area of occupancy (typically less than 20 km
2
).
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IV. List of vascular plants
A. Pteridophytes
ASPLENIACEAE
Asplenium africanum Desv.
EQUATORIAL GUINEA. Annobón: margens da lagon, Newton s.n. (LISU 165590); lago A Pot, margens do
lago, Carvalho 3073 (MA 734545); alrededores del hotel de Annobón, Velayos et al. 11503 (MA 828511);
borde del lago A Pot, Velayos et al. 11551 (MA 831216); subida al pico Quioveo, Velayos et al. 11633 (MA
843650), 11636 (MA 843653); subida a Santa Mina desde San Pedro, Velayos et al. 11683 (MA 843698);
Crater Lake, Wrigley 202 (K).
Previously recorded by Mildbraed (1922: 159, sub var. subintegrum C.Chr.), Alston (1944: 74, sub A. currori
Hook.), Sobrinho (1953: 178) and Velayos et al. (2001: 149).
Asplenium anisophyllum Kunze
EQUATORIAL GUINEA. Annobón: from Anganchi to Macizo Santa Mina, Gascoinge 66 (MA 727195);
southwest side of lago A Pot, Gascoinge 79 (MA 727194).
Previously recorded by Velayos et al. (2008: 27).
Asplenium annobonense Mildbr. ex Viane
EQUATORIAL GUINEA. Annobón: cumbre das Alturas de Mol, Carvalho 3100 (MA 734549); subida al pico
Lago desde el lago A Pot, Velayos et al. 11601 (MA 831091), 11604 (MA 831088); subida a Santa Mina desde
San Pedro, Velayos et al. 11680 (MA 843695).
Previously recorded by Mildbraed (1922: 159) and Alston (1944: 78, sub A. geppii Carruth.).
Endemic to Annobón.
IUCN category: EN A2ac; B2ab (here proposed).
Asplenium nigritianum Hook.
EQUATORIAL GUINEA. Annobón: macizo Santa Ana, Gascoigne 64 (LISC); pico Lago, Gascoigne 82
(LISC); subida al pico Quioveo, Velayos et al. 11653 (MA 843669); subida a Santa Mina desde San Pedro,
Velayos et al. 11686 (MA 843625); W of Crater lake, Wrigley 38 (K).
Previously recorded by Mildbraed (1922: 159), Alston (1944: 79), Moran & Smith (2001: 312) and
Velayos et al. (2001: 152).
Endemic to the islands of Guinea Gulf.
IUCN category: VU D2 (here proposed).
Asplenium sandersonii Hook.
EQUATORIAL GUINEA. Annobón: pico Lago, Gascoigne 76 (LISC, MA 727201); subida al pico Lago desde
el lago A Pot, Velayos et al. 11618 (MA 831074); W of crater lake, Wrigley & Melville 36 (K).
Previously recorded by Mildbraed (1922: 159), Alston (1944: 80) and Velayos et al. (2001: 152).
Asplenium variabile Hook.
Previously recorded by Figueiredo et al. (2009: 215). The presence of this species in Annobón seems plausible
since it is present in nearest areas.
ATHYRIACEAE
Callipteris prolifera (Lam.) Bory [DRYOPTERIDACEAE in Fl. Guinea]
EQUATORIAL GUINEA. Annobón: collado de Cus, Aedo et al. 18073 (MA 831291); Palé, nas margens do río
Jada, Carvalho 3131 (MA 734547); from Anganchi to Santa Mina, Gascoinge 62 (MA 727200).
Previously recorded by Alston (1944: 74, sub Diplazium proliferum (Lam.) Kaulf.).
BLECHNACEAE
Blechnum attenuatum (Sw.) Mett.
EQUATORIAL GUINEA. Annobón: Santa Mina-Gipfel, Mildbraed 6694 (HBG).
Previously recorded by Mildbraed (1922: 159), Alston (1944: 80) and Figueiredo et al. (2009: 215).
Phytotaxa 171 (1) © 2014 Magnolia Press
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CHECKLIST OF THE VASCULAR PLANTS OF ANNOBÓN
CYATHEACEAE
Cyathea manniana Hook.
Most of the records of this species are based on the specimen Mildbraed 6693 [Mildbraed (1922: 159), Alston
(1944: 60), Guinea (1946: 222), Peris (1961: 41), Hernández Pacheco (1943) and Heras et al. (2002: 120)]. This
specimen was supposed to be filed at B (now destroyed). We have failed to find a duplicate at HBG.
Figueiredo et al. (2009: 214, sub Alsophila manniana (Hook.) R.M.Tryon) reference other specimens (Wrigley 226
(BM) and Descoings 12958 (MPU)) collected in 1959 and 1964 respectively. The three specimens were collected
in the same locality: Santa Mina Peak. During our trip of 2011 we have searched carefully in the same area, and
have not been able to find it.
DAVALLIACEAE
Davallia chaerophylloides (Poir.) Steud.
EQUATORIAL GUINEA. Annobón: pr. Anganchi, Aedo et al. 18062 (MA 831279); base del pico do Fogo,
Fero et al. 227 (MA 800959); from Anganchi (San Pedro) to Cus, Gascoigne 60 (MA 735454).
Previously recorded by Alston (1944: 72), Velayos et al. (2008: 41, sub D. denticulata (Burm.f.) Mett. ex Kuhn.)
and Figueiredo et al. (2009: 215).
DRYOPTERIDACEAE
Dryopteris aurantiaca J.P.Roux
EQUATORIAL GUINEA. Annobón: pico del Centro, Wrigley & Melville 215 (K).
Previously recorded by Velayos et al. (2008: 53).
GLEICHENIACEAE
Dicranopteris linearis (Burm.f.) Underw.
EQUATORIAL GUINEA. Annobón: cumbre del pico do Fogo, Carvalho 3086 (MA 556035); base del pico do
Fogo, Fero et al. 225 (MA 800961); cumbre do pico Santa Estephania, Newton s.n. (LISU 165584).
Previously recorded by Mildbraed (1922: 160, sub Gleichenia linearis (Burm.f.) C.B.Clarke), Alston (1944: 93,
1956: 8, sub G. linearis), Sobrinho (1953: 178, sub G. linearis), Fernández-Casas (1992: 37) and Velayos et al.
(2001: 160).
HYMENOPHYLLACEAE
Hymenophyllum hirsutum (L.) Sw.
EQUATORIAL GUINEA. Annobón: Santa Mina–Gipfel, Mildbraed 6701a, 6702 (HBG); subida a Santa Mina
desde San Pedro, Velayos et al. 11687 (MA 843628).
Previously recorded by Mildbraed (1922: 159, sub H. ciliatum Sw.), Alston (1944: 59, sub H. ciliatum var.
boryanum (Willd.) Mett. ex Kuhn), Guinea (1946: 221, sub H. ciliatum) and Figueiredo et al. (2009: 215).
Hymenophyllum kuhnii C.Chr.
EQUATORIAL GUINEA. Annobón: Quioveo, Mildbraed 6530 (HBG); Santa Mina, Mildbraed 6701 (BM).
Previously recorded by Mildbraed (1922: 159, sub H. polyanthos auct.), Alston (1944: 60, sub H. mildbraedii
(Brause ex Brause & Hieron.) Alston), Guinea (1946: 222; 1968: 134, sub H. mildbraedii), Moran & Smith (2001:
323) and Velayos et al. (2001: 162, sub H. mildbraedii).
Trichomanes africanum Christ
Alston (1944: 57) recorded this species based on Mildbraed 6556. Mildbraed (1922: 159) recorded T. pyxidiferum
auct. based on the same specimen, probably a misidentification. It was not found any material to support this
record. However the presence of this species in Annobón seems plausible since it is present in nearest areas.
Trichomanes clarenceanum Ballard
EQUATORIAL GUINEA. Annobón: subida a Santa Mina desde San Pedro, Velayos et al. 11687bis (MA
844975).
New record for Annobón. It seems to be the southernmost record of this species.
Trichomanes crispiforme Alston
Previously recorded by Mildbraed (1922: 159, sub T. crispum L.: no material was found to support this record),
Alston (1944: 57) and Moran & Smith (2001: 334, sub T. crenatum Bosch). However the presence of this species
in Annobón seems plausible since it is present in nearest areas.
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Trichomanes liberiense Copel.
EQUATORIAL GUINEA. Annobón: Kratersee, Elaeis-Wald, Mildbraed 6775 (HBG); subida al pico Lago
desde el lago A Pot, Velayos et al. 11628 (MA 828573); subida al pico Quioveo, Velayos et al. 11645 (MA
843662); cresta del pico Lago, Velayos et al. 11667 (MA 843683); subida a Santa Mina desde San Pedro,
Velayos et al. 11684 (MA 843626); sendero entre Aual y Mábana, Velayos et al. 11691 (MA 843632), 11692
(MA 843633).
The specimen Midlbraed 6775 (HBG) was recorded as T. motleyi Bosch (Mildbraed 1922: 159), and as T. erosum
Willd. by Alston (1944: 58). However, it has an orbicular lamina with black trichomes on the margin which fit with
T. liberiense.
New record for Annobón.
Trichomanes melanotrichum Schltdl.
Figueiredo et al. (2009: 215) recorded this species based on Descoings 12879b (MPU). The record of Mildbraed
(1922: 159), sub T. pyxidiferum auct., is probably T. africanum (see comments to this species). However the
presence of this species in Annobón seems plausible since it is present in nearest areas.
Trichomanes mettenii C.Chr.
EQUATORIAL GUINEA. Annobón: valle de Anganchi, Aedo et al. 18066 (MA 831284), 18071 (MA 831289);
Nordkrater, Weg zum Quioveo, Mildbraed 6546 (HBG); camino de Palé a Santa Cruz (Awal), junto al arroyo Jada,
Fero et al. 254 (MA 800853); subida al pico Lago desde el lago A Pot, Velayos et al. 11626 (MA 828575); subida
al pico Quioveo, Velayos et al. 11647 (MA 843663); cresta del pico Lago, Velayos et al. 11668 (MA 843684); San
Pedro, Velayos et al. 11679 (MA 843694); subida a Santa Mina desde San Pedro, Velayos et al. 11682 (MA
843697); sendero entre Aual y Mábana, Velayos et al. 11693 (MA 843634), 11695 (MA 843636), 11696 (MA
843637); sendero entre Palé y Aual, cruce del río Jada, M. Velayos et al. 11700 (MA 843641), 11701 (MA
843642).
Previously recorded by Mildbraed (1922: 159), Alston (1944: 59) and Figueiredo et al. (2009: 215, sub
Crepidomanes mettenii (C.Chr.) Ebihara & Dubuisson).
Trichomanes rigidum Sw.
Previously recorded by Mildbraed (1922: 159, sub var. annobonense Brause); Moran & Smith (2001: 336, sub var.
annobonense Brause) and Alston (1944: 58, sub T. cupressoides Desv.) It was not found any material to support
these records. However the presence of this species in Annobón seems plausible since it is present in nearest areas.
LYCOPODIACEAE
Huperzia ophioglossoides (Lam.) Rothm.
Mildbraed (1922: 160) recorded Lycopodium adolfi-friderici Herter based on the specimen Mildbraed 6560a.
Alston (1944: 96) suggested that it should be considered as H. ophioglossoides. The specimen was lost at B
herbarium and no dupla has been found. Additionally, no material of this species has been located during our field
trips. However, the presence of this species in Annobón seems plausible since it is present in Bioko and nearest
areas.
Lycopodiella cernua (L.) Pic.Serm.
EQUATORIAL GUINEA. Annobón: cumbre del pico do Fogo, Carvalho 3085 (MA 556082).
Previously recorded by Fernández-Casas (1992: 38), Fernández-Casas & Morales (1995: 234) and
Velayos et al. (2001: 167).
MARATTIACEAE
Marattia fraxinea J.Sm.
EQUATORIAL GUINEA. Annobón: pico Quiveo, Gascoinge 89 (MA 727198); subida al pico Quioveo,
Velayos et al. 11652 (MA 843668).
Previously recorded by Mildbraed (1922: 160) and Alston (1944: 94).
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CHECKLIST OF THE VASCULAR PLANTS OF ANNOBÓN
NEPHROLEPIDACEAE
Nephrolepis biserrata (Sw.) Schott
EQUATORIAL GUINEA. Annobón: Palé, entre el río Luba da Queque y el arroyo Jada, Carvalho 3129 (MA
512296); alrededores del hotel de Annobón, Velayos et al. 11504 (MA 828512); subida al pico Lago desde el
lago A Pot, Velayos et al. 11580 (MA 828144); subida al pico Quioveo, Velayos et al. 11649 (MA 843665).
Previously recorded by Mildbraed (1922: 159), Alston (1944: 71), Fernández-Casas (1992: 39) and
Velayos et al. (2001: 168).
Nephrolepis undulata (Afzel. ex Sw.) J.Sm.
EQUATORIAL GUINEA. Annobón: subida al pico Lago desde el lago A Pot, Velayos et al. 11583 (MA
828141).
Previously recorded by Figueiredo et al. (2009: 215).
OLEANDRACEAE
Oleandra annetii Tardieu
EQUATORIAL GUINEA. Annobón: south side of lago A Pot, Gascoinge 78 (MA 727196).
Previously recorded by Figueiredo et al. (2009: 215).
Oleandra distenta Kunze
EQUATORIAL GUINEA. Annobón: pico del Centro, Melville 216 (BM).
Previously recorded by Alston (1944: 69, based on Mildbraed 6579, it was not found any material, at
HBG, to support this record) and Figueiredo et al. (2009: 215).
OPHIOGLOSSACEAE
Ophioglossum reticulatum L.
EQUATORIAL GUINEA. Annobón: San Antonio de Palé, subida al pico do Fogo desde la cantera, Fero et al.
220 (MA 800966); base do pico S. Estephania, Newton s.n. (LISU 165583).
Previously recorded by Sobrinho (1953: 178), Exell (1956: 9) and Figueiredo et al. (2009: 215).
POLYPODIACEAE
Lepisorus excavatus (Bory ex Willd.) Ching
EQUATORIAL GUINEA. Annobón: pico Quiveo, Gascoinge 91 (MA 727197); top of pico Surcado, Wrigley
227 (K).
Previously recorded by Mildbraed (1922: 160, sub Polypodium preussi Hieron.), Alston (1944: 89, sub P. preussii)
and Velayos et al. (2001: 171).
Loxogramme abyssinica (Baker) M.G.Price
EQUATORIAL GUINEA. Annobón: NW slopes of pico Quiveo, Gascoinge 92 (MA 727199); subida al pico
Lago desde el lago A Pot, Velayos et al. 11627 (MA 828574).
Previously recorded by Mildbraed (1922: 160, sub Polypodium loxogramme Mett.) and Alston (1944: 90, sub L.
lanceolata (Sw.) C.Presl).
During several years L. lanceolata was formally used to name the African Loxogramme of this group. According to
Moran & Smith (2001: 326), L. lanceolata is confined to Mauritius and Reunion, the rest of the range of the species
should be named as L. abyssinica.
Microsorum punctatum (L.) Copel.
EQUATORIAL GUINEA. Annobón: borde del lago A Pot, Velayos et al. 11570 (MA 828153); subida al pico
Quioveo, Velayos et al. 11632 (MA 843649), 11637 (MA 843654).
Previously recorded by Mildbraed (1922: 160, sub Polypodium punctatum (L.) Sw.), Alston (1944: 88, sub
Polypodium irioides Poir.) and Figueiredo et al. (2009: 215).
Polypodium lanceolatum L.
EQUATORIAL GUINEA. Annobón: cerca del lago A Pot, Velayos et al. 11539 (MA 828461); cumbre del pico
Quioveo, Velayos et al. 11659 (MA 843675).
New record for Annobón.
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Polypodium lycopodioides L.
EQUATORIAL GUINEA. Annobón: margens do lagon, Newton s.n. (LISU 165585); Palé–San Pedro,
márgenes del río Quepuchin, Carvalho 3091 (MA 556034); subida al pico Lago desde el lago A Pot, Velayos et
al. 11590 (MA 828134).
Previously recorded by Mildbraed (1922: 160), Alston (1944: 88), Sobrinho (1953: 178) and Velayos et al.
(2001: 172).
Xiphopteris serrulata (Sw.) Kaulf. [GRAMMITIDACEAE in Fl. Guinea]
EQUATORIAL GUINEA. Annobón: Santa Mina-Gipfel, Mildbraed 6703 (HBG).
Previously recorded by Mildbraed (1922: 160, sub Polypodium serrulatum (Sw.) Mett.) and Alston (1944: 88, sub
Polypodium duale auct.).
PSILOTACEAE
Psilotum nudum (L.) P.Beauv.
EQUATORIAL GUINEA. Annobón: laderas del pico do Fogo, Carvalho 3083 (MA 543122); roquedos al E del
pico do Fogo, Velayos et al. 11661 (MA 843677).
Previously recorded by Fernández-Casas (1992: 40), Fernández-Casas & Morales (1995: 234) and
Velayos et al. (2001: 172).
PTERIDACEAE
Adiantum mettenii Kuhn
EQUATORIAL GUINEA. Annobón: margens da lagon, Newton s.n. (LISU 165589).
Previously recorded by Sobrinho (1953: 178, sub A. soboliferum Wall.). In Velayos et al. (2008: 98), A. mettenni
was mentioned on Annobón based on literature. Now it has been possible to study Newton’s specimen and to
confirm this record.
Adiantum philippense L.
EQUATORIAL GUINEA. Annobón: valle de Anganchi, Aedo et al. 18067 (MA 831285); camino de Palé a
Santa Cruz (Awal), Fero et al. 265 (MA 800844).
New record for Annobón.
Pellaea doniana J.Sm. ex Hook.
EQUATORIAL GUINEA. Annobón: área do rio Ajob (Jobo), Carvalho 3135 (MA 734548); N da isla, Newton
s.n. (LISU 165588); alrededores del hotel de Annobón, Velayos et al. 11502 (MA 828510); borde del lago A
Pot, Velayos et al. 11561 (MA 831226).
Previously recorded by Mildbraed (1922: 159), Alston (1944: 82) and Sobrinho (1953: 178).
Pityrogramma calomelanos (L.) Link
EQUATORIAL GUINEA. Annobón: Palé, alrededores de Dyo Dyo, camino de San Pedro, Carvalho 3115
(MA 543121); base del pico do Fogo, Fero et al. 224 (MA 800962).
Previously recorded by Fernández-Casas (1992: 40), Fernández-Casas & Morales (1995: 234) and
Velayos et al. (2001: 174).
Pteris linearis Poir.
EQUATORIAL GUINEA. Annobón: subida al pico Lago desde el lago A Pot, Velayos et al. 11620 (MA
831072).
Previously recorded by Figueiredo et al. (2009: 215).
Pteris togoensis Hieron.
Previously recorded by Alston (1944: 84, sub Pt. quadriaurita auct.) and Figueiredo et al. (2009: 216). We have
not been able to examine any material of this species. However the presence in Annobón seems plausible since it is
present in nearest areas.
Vittaria guineensis Desv. [VITTARIACEAE in Fl. Guinea]
EQUATORIAL GUINEA. Annobón: S of crater lake, Melville 153 (K); Nordkrater, Westrant, Mildbraed 6565
(HBG).
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CHECKLIST OF THE VASCULAR PLANTS OF ANNOBÓN
Previously recorded by Mildbraed (1922: 159, sub V. owariensis Fée), Alston (1944: 87, sub V. owariensis) and
Velayos et al. (2001: 181). All these records are based on Mildbraed 6565. The specimen at B was probably
destroyed, and the dupla at HBG has no spores since its sporangies are not well developed. This specimen has some
petioles with a brown base and some other blackish and long leaves (30–37 cm long, 0.5–0.7 cm wide). These
features suggest that it should be identified as V. guineensis.
Vittaria owariensis Fée [VITTARIACEAE in Fl. Guinea]
Recorded by Figueiredo et al. (2009: 216) on the base of two collections at MPU by Descoings. The presence of
this species in Annobón seems plausible since it is present in nearest areas.
TECTARIACEAE
Arthropteris orientalis (J.F.Gmel.) Posth. [OLEANDRACEAE in Fl. Guinea]
EQUATORIAL GUINEA. Annobón: Palé–alturas de Mol, margens do rio Bobo, Carvalho 3096 (MA 734550);
borde del lago A Pot, Velayos et al. 11557 (MA 831222).
Previously recorded by Mildbraed (1922: 159, sub Dryopteris orientalis (J.F.Gmel.) C.Chr.) and Alston (1944: 70).
Tectaria camerooniana (Hook.) Alston [DRYOPTERIDACEAE in Fl. Guinea]
EQUATORIAL GUINEA. Annobón: alrededores del hotel de Annobón, Velayos et al. 11505 (MA 828513);
borde del lago A Pot, Velayos et al. 11546 (MA 831211); subida al pico Quioveo, Velayos et al. 11639 (MA
843656); subida a Santa Mina desde San Pedro, Velayos et al. 11689 (MA 843630); entre Palé y Aual, cruce del
río Jada, Velayos et al. 11698 (MA 843639).
Previously recorded by Figueiredo et al. (2009: 216).
Tectaria fernandensis (Baker) C.Chr. [DRYOPTERIDACEAE in Fl. Guinea]
EQUATORIAL GUINEA. Annobón: southwest side of lago A Pot, Gascoigne 83 (LISC, MA 727193,
735456).
Previously recorded by Mildbraed (1922: 159) and Alston (1944: 68). Gascoigne 83 at MA is poor material that
does not show any bud. A photograph, filed at MA, of the type is not more informative. Othewise, the specimens
studied fits very well with T. fernandensis.
THELYPTERIDACEAE
Christella dentata (Forssk.) Brownsey & Jermy
EQUATORIAL GUINEA. Annobón: camino de Palé a Santa Cruz (Awal), riachuelo en las proximidades de
punta Palanjana, Fero et al. 264 (MA 800845); Ambo, Melville 144 (K); subida al pico Lago desde el lago A
Pot, Velayos et al. 11619 (MA 831073).
Previously recorded by Velayos et al. (2001: 179).
Cyclosorus striatus (Schumach.) Ching
EQUATORIAL GUINEA. Annobón: borde del lago A Pot, Velayos et al. 11566 (MA 828157).
Previously recorded by Figueiredo et al. (2009: 215).
Pneumatopteris oppositifolia (Hook.) Holttum
EQUATORIAL GUINEA. Annobón: towards pico Surcado from San Pedro, Wrigley 231 (K).
Previously recorded by Velayos et al. (2001: 180).
Pneumatopteris venulosa (Hook. ex Kuntze) Holttum
Previously recorded by Mildbraed (1922: 159, sub Dryopteris elata (Mett. ex Kuhn) C.Chr.), Alston (1944: 66, sub
Dryopteris venulosa Hook. ex Kuntze) and Guinea (1946: 223, sub Nephrodium venulosum Hook.).
Figueiredo et al. (2009: 215) recorded this species too, based on Wrigley 231 (BM). It has not been possible to
reexamine Kew’s duplicate to clarify if this collection is heterogeneous or if the identification by Velayos et al.
(2008: 113) was a misinterpretation.
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B. MAGNOLIIDS
ANNONACEAE
Annona muricata L.
EQUATORIAL GUINEA. Annobón: alrededores del hotel de Annobón, Velayos et al. 11496 (MA 828502);
sendero entre Palé y Aual, Velayos et al. 11697 (MA 843638).
Previously recorded by Exell (1963: 96, 1973: 336).
Naturalized.
Annona reticulata L.
EQUATORIAL GUINEA. Annobón: camino de Palé a Santa Cruz (Awal), Fero et al. 251 (MA 800856);
camino del lago A Pot, cerca del lago, Velayos et al. 11574 (MA 828150).
Previously recorded by Exell (1963: 96, 1973: 336).
Naturalized.
Annona squamosa L.
EQUATORIAL GUINEA. Annobón: quebrada del río A Bobo, al SE de Palé, Aedo et al. 18045 (MA 831262);
alrededores del hotel de Annobón, Velayos et al. 11500 (MA 828508).
Previously recorded by Mildbraed (1922: 161), Exell (1944: 101, 1973: 336) and Cufodontis (1954: 117).
Naturalized.
Uvaria ovata (Dunal) A.DC. subsp. ovata
EQUATORIAL GUINEA. Annobón: Santa Cruz, Newton s.n. (LISU).
According to Keay (1952: 544), the subsp. ovata can be distinguished from subsp. afzeliana (DC.) Keay for its
oblong-lanceolate leaves, rounded to cordate at the base and the midrib beneath densely clothed with long simple
or fascicled hairs. The specimen from Annobón has very dense fascicled hairs on the midrib beneath that
correspond to subsp. ovata. This taxa was only known in West tropical Africa, until it was recorded in São Tomé
by Paiva (1979: 7–8) based on the collection from Espírito-Santo.
New record for Annobón and Equatorial Guinea.
LAURACEAE
Persea americana Mill.
EQUATORIAL GUINEA. Annobón: SW of Crater Lake, Melville 239 (MA 209749); subida al Quepuchin
desde la ermita de San Juan, Velayos et al. 11669 (MA 843685).
Previously recorded by Exell (1963: 110, 1973: 337).
Naturalized.
PIPERACEAE
Peperomia blanda (Jacq.) Kunth
EQUATORIAL GUINEA. Annobón: camino de Palé a Santa Cruz (Awal), junto al arroyo Jada, Fero et al. 255
(MA 800852); borde del lago A Pot, Velayos et al. 11549 (MA 831214).
Immelman (2000: 29) pointed out that P. blanda is the most common Peperomia species in Central and South
America, but less frequent in Africa. There is no record from West Africa. According to Diniz (1997: 30–32), the
variety found in East Africa is var. leptostachya (Hook.f. & Arn.) Düll, which is distinguishable from the typical by
its leaves and stems densely pubescent to ± glabrous. The specimens from Annobón could belong to var.
leptostachya, as they have stems and leaves pubescent.
New record for Annobón and Equatorial Guinea.
Peperomia kamerunana C.DC.
EQUATORIAL GUINEA. Annobón: borde del lago A Pot, Velayos et al. 11548 (MA 831213).
New record for Annobón.
IUCN category: EN B2ab (iii)
Peperomia pellucida (L.) Kunth
EQUATORIAL GUINEA. Annobón: pr. Anganchi, Aedo et al. 18063 (MA 831280); borde del lago A Pot,
Fero et al. 238 (MA 800868).
New record for Annobón.
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CHECKLIST OF THE VASCULAR PLANTS OF ANNOBÓN
Peperomia vulcanica Baker & C.H.Wright
EQUATORIAL GUINEA. Annobón: subida al pico Quioveo, Velayos et al. 11658 (MA 843674); pico
Surcado, Wrigley & Melville 70 (MA 294800).
Previously recorded by Mildbraed (1922: 160–161, sub P. annobonensis Mildbr., 1937: 699, sub P. annobonensis),
Exell (1944: 276, sub P. annobonensis, 1963: 110, sub P. hygrophila Engl., 1973: 338, sub P. hygrophila), Guinea
(1946: 271, sub P. annobonensis, 1968: 134), Düll (1973: 103, sub P. annobonensis) and Fero et al. (2003: 48).
Piper umbellatum L.
EQUATORIAL GUINEA. Annobón: subida al pico Lago desde el lago A Pot, Velayos et al. 11613 (MA
831079); subida al pico Quioveo, Velayos et al. 11656 (MA 843672); S of Crater Lake, Wrigley & Melville 147
(MA 294974).
Previously recorded by Mildbraed (1922: 160, sub Heckeria subpeltata (Willd.) Kunth), Exell (1944: 276, 1973:
339) and Fero et al. (2003: 48, sub Pothomorphe umbellata (L.) Miq.).
C. MONOCOTS
AMARYLLIDACEAE
Hymenocallis littoralis (Jacq.) Salisb.
Previously recorded by Exell (1963: 115, 1973: 392). Both records are supported by the specimen Melville 234,
supposedly kept at K herbarium. We have failed locating the mentioned specimens.
Originally from tropical America this species has been introduced all over tropical regions in Africa, and
its presence in Annobón is likely.
ARECACEAE [PALMAE in Fl. Guinea]
Cocos nucifera L.
EQUATORIAL GUINEA. Annobón: Palé, junto al hotel de Annobón, Aedo et al. 18092 (MA 831310).
Previously recorded by Mildbraed (1922: 160) and Exell (1944: 352).
Elaeis guineensis Jacq.
EQUATORIAL GUINEA. Annobón: pr. Anganchi, Aedo et al. 18065 (MA 831283).
Previously recorded by Mildbraed (1922: 160) and Exell (1944: 351).
ASPARAGACEAE [AGAVACEAE in Fl. Guinea]
Cordyline fruticosa (L.) A.Chev.
EQUATORIAL GUINEA. Annobón: borde del lago A Pot, Fero et al. 239 (MA 800867); Santa Cruz and near
Quioveo, Wrigley & Melville 48 (K, MA 258597).
Previously recorded by Exell (1963: 116, 1973: 392).
According to Exell (1963: 116) is a native of SE Asia and it has been introduced into tropical Africa and
America.
BROMELIACEAE
Ananas comosus (L.) Merr.
EQUATORIAL GUINEA. Annobón: camino del lago A Pot, cerca del lago, Velayos et al. 11576 (MA
828148); near Crater Lake, W side, Wrigley & Melville 291 (BM, K, MA 219279).
Previously recorded by Exell (1944: 342, 1973: 389).
CANNACEAE
Canna indica L.
EQUATORIAL GUINEA. Annobón: borde del lago A Pot, Velayos et al. 11558 (MA 831223).
Previously recorded by Exell (1944: 341, 1973: 390) and Cufodontis (1972: 1596, sub C. bidentata Bertol.).
Introduced and naturalized.
COMMELINACEAE
Commelina benghalensis L.
EQUATORIAL GUINEA. Annobón: pr. Anganchi, Aedo et al. 18058 (MA 831275); San Pedro, Wrigley &
Melville 228 (K, MA 223075).
Previously recorded by Exell (1963: 116, 1973: 388), Faden (1996: 87) and Cabezas et al. (2009: 110).
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Commelina diffusa Burm.f.
EQUATORIAL GUINEA. Annobón: camino del lago A Pot, cerca del lago, Velayos et al. 11573 (MA
828563); borde del lago A Pot, Velayos et al. 11555 (MA 831220); N shore of the Crater Lake, Wrigley &
Melville 77 (K, MA 223081).
Previously recorded by Exell (1944: 350, 1973: 388) and Cabezas et al. (2009: 111, sub C. diffusa subsp. montana
J.K.Morton).
Two subspecies can be distinguished in C. diffusa: subsp. diffusa and subsp. montana. The second can be clearly
identified by its smooth seeds (vs. verrucous in the type-subspecies). Most of the materials from Annobón have
verrucous seeds except the specimen Melville 77, which has smooth seeds. Since the plant is still inmature, more
material is required to confirm the presence of both subspecies in the island, and therefore, we prefer to include all
the specimens from the Island under the specific range.
Palisota pedicellata K.Schum.
EQUATORIAL GUINEA. Annobón: Santa Mina, Mildbraed 6695 (HBG); subida a Santa Mina desde la aldea
de San Pedro, Velayos et al. 11685 (MA 843627); Sulcada, Wrigley & Melville 271 (BM 826251).
Previously recorded by Mildbraed (1922: 160, sub P. laxiflora var. annobonensis Mildbr.), Exell (1944: 349, 1968:
134, 1973: 388) and Cabezas et al. (2009: 115).
Endemic for Annobón and São Tomé.
IUCN category: VU D2 (here proposed).
Pollia condensata C.B.Clarke
EQUATORIAL GUINEA. Annobón: subida al pico Lago desde el lago A Pot, Velayos et al. 11603 (MA
831089).
New record for Annobón.
COSTACEAE
Costus giganteus Welw. ex Ridl.
EQUATORIAL GUINEA. Annobón: valle de Anganchi, Aedo et al. 18069 (MA 831287); Palé, entre o rio
Luba da Que e o rio Arroyo Jada, Carvalho 3132 (MA 701991); subida al pico Lago desde el lago A Pot,
Velayos et al. 11616 (MA 831076); higher parts of the island, Wrigley & Melville 270 (K).
Previously reported by Mildbraed (1922: 160), Exell (1944: 340, 1968: 134, 1973: 389) and Heras et al.
(2002: 119).
CYPERACEAE
Abildgaardia ovata (Burm.f.) Kral
EQUATORIAL GUINEA. Annobón: [no locality], Newton s.n. (LISU 165609).
Previously recorded by Sobrinho (1953: 188, sub A. monostachya (L.) Vahl), Exell (1956: 50, sub A. monostachya,
1973: 399, sub Fimbristylis ovata (Burm.f.) Kern) and Cabezas et al. (2004: 4).
Cyperus cuspidatus Kunth
EQUATORIAL GUINEA. Annobón: just south of Aberdeen, Wrigley & Melville 148 (K).
Previously recorded by Exell (1973: 398) and Cabezas et al. (2004: 7).
Cyperus cyperoides (L.) Kuntze
EQUATORIAL GUINEA. Annobón: quebrada del río A Bobo, al SE de Palé, Aedo et al. 18049 (MA 831266);
lago A Pot, margen derecha, Carvalho 3121 (MA 558517); [no locality], Newton s.n. (LISU 165606);
alrededores del hotel de Annobón, Velayos et al. 11477 (MA 828483); cerca del lago A Pot, Velayos et al.
11538 (MA 828462); N shore of Crater Lake, Wrigley & Melville 81 (MA 189625).
Previously recorded by Mildbraed (1922: 160, sub C. umbellatus Rottb.), Exell (1944: 362, sub C. sublimis (C.B.
Clarke) Dandy, 1956: 50, sub C. sublimis, 1973: 399, sub Mariscus alternifolius Vahl), Sobrinho (1953: 188, sub
C. sublimis), Cebolla-Lozano & Rivas-Ponce (1995a: 35, sub M. alternifolius) and Cabezas et al. (2004: 7).
Cyperus distans L.f.
EQUATORIAL GUINEA. Annobón: pr. Anganchi, Aedo et al. 18061 (MA 831278); San Pedro, Newton s.n.
(LISU 165604); Crater Lake, Wrigley & Melville 181 (K, MA 189504).
Previously recorded by Sobrinho (1953: 188), Exell (1956: 50, 1973: 398, sub Mariscus longibracteatus Cherm.)
and Cabezas et al. (2004: 8).
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CHECKLIST OF THE VASCULAR PLANTS OF ANNOBÓN
The specimen Wrigley & Melville 181 preserved in MA, was misinterpreted in Cabezas et al. (2004: 10) as C.
tenuis Sw. The study of a duplicate of the same collection kept at K and the re-examination of MA voucher
indicates it has to be named C. distans, therefore C. tenuis should be excluded from the Annobón’s catalogue.
Cyperus dubius Rottb.
EQUATORIAL GUINEA. Annobón: quebrada del río A Bobo, al SE de Palé, Aedo et al. 18044 (MA 831261);
camino de Palé a Santa Cruz (Awal), junto al arroyo Jada, Fero et al. 261 (MA 800848); sul da ilha, Newton s.n.
(LISU 165603).
Previously recorded by Sobrinho (1953: 188), Exell (1956: 50; 1973: 398– 399) and Cabezas et al. (2004: 8).
Cyperus ligularis L.
EQUATORIAL GUINEA. Annobón: sea coast near Ambo, Wrigley & Melville 62 (MA 189638).
Previously recorded by Mildbraed (1922: 160, sub C. rufus Kunth, 1937: 698), Exell (1944: 359, 1973: 399) and
Cabezas et al. (2004: 9).
Cyperus sphacelatus Rottb.
EQUATORIAL GUINEA. Annobón: punta Sambobo, Aedo et al. 18054 (MA 831271); [no locality], Newton
s.n. (LISU 165605); borde del lago A Pot, Velayos et al. 11545 (MA 831210); base of pico do Fogo, Wrigley &
Melville 183 (K).
Previously recorded by Mildbraed (1922: 160), Exell (1944: 361, 1956: 50), Sobrinho (1953: 188) and
Cabezas et al. (2004: 10).
Cyperus tenuiculmis Boeckeler
EQUATORIAL GUINEA. Annobón: pr. Anganchi, Aedo et al. 18060 (MA 831277); márgenes del lago A Pot,
Carvalho 3076 (MA 558501).
Previously recorded by Cebolla-Lozano & Rivas-Ponce (1995a: 31) and Cabezas et al. (2004: 10).
Cyperus rotundus L.
EQUATORIAL GUINEA. Annobón: alrededores del hotel de Annobón, Velayos et al. 11474 (MA 828480).
New record for Annobón. This species was previously known from African mainland but not from Gulf of
Guinea Islands.
Fimbristylis dichotoma (L.) Vahl
EQUATORIAL GUINEA. Annobón: nas margens da lagôa, Newton s.n. (LISU 165608); Tortuga Isle, of NE
coast, Wrigley & Melville 204 (K, MA 189492).
Previously recorded by Mildbraed (1937: 698), Sobrinho (1953: 188), Exell (1956: 50, 1973: 399) and
Cabezas et al. (2004: 11).
Scleria lagoensis Boeckeler
EQUATORIAL GUINEA. Annobón: sul da ilha, Newton s.n. (LISU 165607).
Previously recorded by Sobrinho (1953: 188), Exell (1956: 50, 1973: 400) and Cabezas et al. (2004: 20).
DIOSCOREACEAE
Dioscorea alata L.
Previously recorded by Exell (1963: 115).
According to Nkounkou (1993: 48) and Wilkin (2001: 375) is a pantropical species by introduction, of
Indochinese origin, so its presence in Annobón is quit likely.
Dioscorea cayennensis Lam.
EQUATORIAL GUINEA. Annobón: ensenada de Pala Batelu, Aedo et al. 18087 (MA 831305); Ambo, S of
Governor house, Wrigley & Melville 2 (K, MA 192265).
Previously recorded by Exell (1963: 115) and Nkounkou (1993: 56).
Very close to D. praehensilis auct. According to Nkounkou (1993: 48) and Wilkin (2001: 375), D. cayennensis has
thicker male inflorescences with 2(3) spikes and axes with more lax male flowers. The Annobón specimens have
inflorescences with 1–2 spikes.
Cultivated and naturalized in the island.
Dioscorea dumetorum (Kunth) Pax
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EQUATORIAL GUINEA. Annobón: S of Ambo towards pico do Fogo, Wrigley & Melville 111 (K); N of
Santa Cruz, Wrigley & Melville 253 (K).
Previously recorded from Exell (1963: 115).
GRAMINEAE
Anthephora cristata (Döll) De Wild. & T.Durand
EQUATORIAL GUINEA. Annobón: ensenada de Pala Batelu, Aedo et al. 18085 (MA 831303).
Previously recorded by Exell (1963: 117).
Aristida adscensionis L.
EQUATORIAL GUINEA. Annobón: Palé, alrededores de Dyo Dyo, camino de San Pedro, Carvalho 3112
(MA 558450); Ambo, W beach, Melville 160 (MA 183844); norte da ilha, Newton s.n. (LISU 165600).
Previously recorded by Sobrinho (1953: 189), Exell (1956: 52) and Cebolla-Lozano & Rivas-Ponce
(1995b: 19).
Bambusa vulgaris Wendl. ex Nees
EQUATORIAL GUINEA. Annobón: borde del lago A Pot, Fero et al. 233 (MA 800873).
Previously recorded by Exell (1963: 117).
Coix lacryma-jobi L.
EQUATORIAL GUINEA. Annobón: Ambo, Wrigley 21 (MA 187587).
Previously recorded by Exell (1963: 118).
Cymbopogon citratus (DC.) Stapf
Previously recorded by Exell (1963: 118).
Its presence in Annobón seems plausible since it is naturalized in the rest of Equatorial Guinea
Cynodon dactylon (L.) Pers.
EQUATORIAL GUINEA. Annobón: alrededores del hotel de Annobón, Velayos et al. 11515 (MA 828523).
New record for Annobón.
Digitaria horizontalis Willd.
EQUATORIAL GUINEA. Annobón: San Pedro, márgenes del río Anganchi, Carvalho 3093 (MA 558443);
NW corner of island, Melville 119 (MA 183855); perto povoação, Newton s.n. (LISU 165595); subida desde la
cantera hacia el lago A Pot, Velayos et al. 11533 (MA 828467).
Previously recorded by Sobrinho (1953: 189), Exel (1956: 52) and Cebolla- Lozano & Rivas-Ponce
(1995b: 20).
Eleusine indica (L.) Gaertn.
EQUATORIAL GUINEA. Annobón: Crater Lake, Melville 294 (MA 183859); alrededores del hotel de
Annobón, Velayos et al. 11476 (MA 828482).
Previously recorded by Exell (1944: 366) and Phillips (1972: 257).
Eriochloa fatmensis (Hochst. & Steud.) Clayton
EQUATORIAL GUINEA. Annobón: perto da aldea principal, Newton s.n. (LISU 165594).
Previously recorded by Sobrinho (1953: 189, sub E. nubica (Steud.) Hack. & Stapf ex Thell.) and Exell
(1956: 52, sub E. nubica).
Heteropogon contortus (L.) P.Beauv. ex Roem. & Schult.
EQUATORIAL GUINEA. Annobón: Palé, Carvalho 3054 (MA 558448); towards pico do Fogo and Crater
Lake, S of Ambo, Melville 104 (MA 183866).
Previously recorded by Mildbraed (1922: 160, sub Andropogon contortus L.), Exell (1944: 381) and Cebolla-
Lozano & Rivas-Ponce (1995b: 20).
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CHECKLIST OF THE VASCULAR PLANTS OF ANNOBÓN
Hyparrhenia rufa (Nees) Stapf
EQUATORIAL GUINEA. Annobón: entre Palé y pico do Fogo, a medio camino, Carvalho 3082 (MA
558447); NW corner of island, Melville 118 (MA 183865); [no locality], Newton s.n. (LISU 165591); subida al
pico do Fogo desde la cantera, Velayos et al. 11660 (MA 843676).
Previously recorded by Sobrinho (1953: 189), Exell (1956: 52), Clayton (1969: 65, sub H. rufa var. rufa) and
Cebolla-Lozano & Rivas-Ponce (1995b: 20).
Melinis minutiflora P.Beauv.
EQUATORIAL GUINEA. Annobón: cumbre del pico do Fogo, Carvalho 3084 (MA 558451); between San
Juan and San Pedro, Wrigley 73 (MA 183872).
Previously recorded by Mildbraed (1922: 160), Exell (1944: 378) and Cebolla Lozano & Rivas Ponce
(1995b: 21).
Melinis reynaudioides (C.E.Hubb.) G.Zizka
Previously recorded by Mildbraed (1922: 160, 1937: 697, sub Rhynchelytrum reynaudioides C.E.Hubb., Exell
(1944: 377, sub R. reynaudioides), Guinea (1946: 232, sub R. reynaudioides) and Brenan (1979: 464, sub R.
reynaudioides).
Endemic to Annobón. IUCN category CR A2ac; B2ab (here proposed).
Oplismenus burmannii (Retz.) P.Beauv.
EQUATORIAL GUINEA. Annobón: lago A Pot, margen derecha, Carvalho 3155 (K, MA 558444); de Palé a
Santa Cruz (Awal), Fero et al. 263 (MA 800846); S. João, Newton s.n. (LISU 165596).
Previously recorded by Sobrinho (1953: 189) and Cebolla-Lozano & Rivas-Ponce (1995b: 21).
Oplismenus hirtellus (L.) P.Beauv.
EQUATORIAL GUINEA. Annobón: path to Quioveo (pico del Centro), just above N end of Crater Lake,
Wrigley & Melville 163 (K).
Previously recorded by Exell (1963: 117).
Panicum brevifolium L.
EQUATORIAL GUINEA. Annobón: pico do Fogo, SW side, Melville 187 (MA 183881).
Previously recorded by Exell (1963: 117).
Panicum maximum Jacq.
EQUATORIAL GUINEA. Annobón: alrededores de Palé, Carvalho 3125 (MA 558449); Ambo, near our
houses, Melville 145 (MA 183882); alrededores del hotel de Annobón, Velayos et al. 11479 (MA 828485).
Previously recorded by Exell (1944: 370) and Cebolla-Lozano & Rivas-Ponce (1995b: 21).
Paspalum conjugatum P.J.Bergius
EQUATORIAL GUINEA. Annobón: borde del lago A Pot, Fero et al. 232 (MA 800874); Ambo, Wrigley 28
(MA 183879).
Previously recorded by Exell (1963: 117).
Paspalum scrobiculatum L.
EQUATORIAL GUINEA. Annobón: márgenes del lago A Pot, Carvalho 3075 (MA 558452); NW of island,
Melville 122 (MA 183880).
Previously recorded by Exell (1963: 117, sub P. commersonii Lam., 1973: 402, sub P. orbiculare G.Forst.) and
Cebolla-Lozano & Rivas-Ponce (1995b: 22).
Paspalum vaginatum Sw.
EQUATORIAL GUINEA. Annobón: Palé, junto al cementerio, Aedo et al. 18078 (MA 831296); N da ilha,
Newton s.n. (LISU 165593).
Previously recorded by Mildbraed (1922: 160, sub P. distichum L.), Exell (1944: 376, 1956: 52) and Sobrinho
(1953: 189).
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Pennisetum laxior (Clayton) Clayton
Previously recorded by Exell (1963: 118; 1973: 400, sub Beckeropsis laxior Clayton).
Its presence in Annobón is plausible since it grows in São Tomé.
Pennisetum polystachion (L.) Schult.
EQUATORIAL GUINEA. Annobón: Ambo, by our houses, Melville 139 (MA 183883).
Previously recorded by Exell (1963: 118).
Rottboellia cochinchinensis (Lour.) Clayton
EQUATORIAL GUINEA. Annobón: lago A Pot, margen derecha, Carvalho 3151 (MA 558446).
Previously recorded by Exell (1944: 381, sub R. exaltata L.f.) and Cebolla-Lozano & Rivas-Ponce (1995b: 22).
Schizachyrium brevifolium (Sw.) Nees ex Büse
Previously recorded by Exell (1963: 118, 1973: 402).
Likely to be present in Annobón, since it grows in the nearby Bioko Island.
Setaria barbata (Lam.) Kunth
EQUATORIAL GUINEA. Annobón: lago, nas margems, Newton s.n. (LISU 165597); subida al pico Lago
desde el lago A Pot, Velayos et al. 11605 (MA 831087); Ambo, Wrigley 15 (MA 183893).
Previously recorded by Exell (1944: 372, 1956: 51) and Sobrinho (1953: 189).
Setaria longiseta P.Beauv.
EQUATORIAL GUINEA. Annobón: San Pedro, márgenes del río Anganchi, Carvalho 3094 (MA 558445).
Previously recorded by Exell (1956: 51). The reference in Cebolla-Lozano & Rivas-Ponce (1995b: 22) is a
misinterpretation of S. mildbraedii Mez.
Setaria mildbraedii Mez
EQUATORIAL GUINEA. Annobón: Straudfelsen im Norden, Mildbraed 6716 (HBG 517929); nas margens da
lagoã, Newton s.n. (LISU 165598).
Previously recorded by Mildbraed (1922: 160, 1937: 697) and Exell (1944: 373).
Endemic to Annobón. IUCN category: CR A2ac; B2ab (here proposed).
Sorghum arundinaceum (Desv.) Stapf
EQUATORIAL GUINEA. Annobón: N e S da ilha, Newton s.n. (LISU 165592).
Previously recorded by Sobrinho (1953: 189) and Exell (1956: 52).
Sporobolus indicus (L.) R.Br.
EQUATORIAL GUINEA. Annobón: alrededores de Palé, Carvalho 3126 (MA 558453); alrededores del hotel
de Annobón, Velayos et al. 11475 (MA 828481).
Previously recorded by Cebolla-Lozano & Rivas-Ponce (1995b: 22, sub var. pyramidalis (P.Beauv.) Veldkamp).
Sporobolus tenuissimus (Mart. ex Schrank) Kuntze
EQUATORIAL GUINEA. Annobón: Mábana, Aedo et al. 18089 (MA 831307).
New record for Annobón.
Sporobolus virginicus (L.) Kunth
EQUATORIAL GUINEA. Annobón: ensenada de Pala Batelu, Aedo et al. 18081 (MA 831299); Isla Tortuga,
Newton s.n. (LISU 165601).
Previously recorded by Sobrinho (1953: 189) and Exell (1956: 51).
Stenotaphrum secundatum (Walter) Kuntze
EQUATORIAL GUINEA. Annobón: NW of island, Melville 130 (MA 186114).
Previously recorded Mildbraed (1922: 160, sub S. glabrum Trin.) and Exell (1944: 374).
ORCHIDACEAE
Aerangis megaphylla Summerh.
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CHECKLIST OF THE VASCULAR PLANTS OF ANNOBÓN
EQUATORIAL GUINEA. Annobón: ridge W of Crater Lake, Wrigley & Melville 34 (MA 293913).
Previously recorded by Mildbraed (1922: 160, sub A. phalaenopsis Schltr., 1937: 698), Exell (1944: 334, 1973:
393, sub A. phalaenopsis), Guinea (1946: 270, sub A. phalaenopsis, 1968: 134) and Stewart (1979: 252).
Stewart (1979: 252) pointed out that A. megaphylla is quite similar to A. stelligera Summerh., but differs from the
smaller flowers. Differences with other related species are also addressed in this paper. Stewart´s (1979: 252)
description does not include description of the fruit. The Annobón´s specimen at MA has fruits with 106 mm long
6.4 mm wide.
Endemic to Annobón.
IUCN category: CR A2ac; B2ab (here proposed).
Bolusiella talbotii (Rendle) Summerh.
EQUATORIAL GUINEA. Annobón: subida al pico Quioveo, Velayos et al. 11635 (MA 843652); ridge W of
Crater Lake, Wrigley & Melville 33 (MA 293919).
Previously recorded by Exell (1963: 115, 1973: 394), Huttchinson & Dalziel (1968: 264), Sanford (1971:
292), Stévart & de Oliveira (2000: 111) and Szlachetko (2008: 275).
The specimens from Annobón preserved in MA matched with the description by Szlachentko (2008: 270)
of B. talbotii because of their not-grooved leaves, spaced sterile bracts, short inflorescence and acute leaves, but
they diverge in leaves width, ranging from 4 to 6 mm.
Bulbophyllum cocoinum Lindl.
EQUATORIAL GUINEA. Annobón: Nordkrater, Mildbraed 6497 (HBG).
Previously recorded by Mildbraed (1922: 160, sub B. aurantiacum sensu Mildbr., 1937: 698), Exell (1944: 325),
Summerhayes (1968: 234) and Sanford (1971: 292).
Bulbophyllum imbricatum Lindl.
EQUATORIAL GUINEA. Annobón: W of Crater Lake, Wrigley & Melville 200 (MA 293924).
Vermuelen (1987: 97, 103, 170) suggest that Melville 200 is a mixed collection of B. maximum and B.
imbricatum. The MA specimen is unequivocally B. imbricatum. Surprisingly Stévart & de Oliveira (2000: 120)
overlooked the B. imbricatum record from Annobón.
Bulbophyllum intertextum Lindl.
Stévart & de Oliveira (2000: 120) recorded from Annobón this species but without precise locality or
herbarium specimen. However, its presence in Annobón is very plausible since it grows in the rest of the
country and in the rest of islands of the Gulf of Guinea.
Bulbophyllum maximum (Lindl.) Rchb.f.
EQUATORIAL GUINEA. Annobón: ridge W of Crater Lake, Wrigley & Melville 31 (MA 293923).
Previously recorded by Sanford (1971: 292, sub B. oxypterum (Lindl.) Rchb.f.), Cufodontis (1972: 1619), Exell
(1973: 394, sub B. oxypterum), Stévart & de Oliveira (2000: 123) and Szlachetko (2008: 151).
Bulbophyllum velutinum (Lindl.) Rchb.f.
EQUATORIAL GUINEA. Annobón: subida al pico Lago desde el lago A Pot, Velayos et al. 11592 (MA
828564); cresta del pico Lago, Velayos et al. 11666 (MA 843682); ridge W of Crater Lake, Wrigley & Melville
31 (MA 293923).
Previously recorded by Exell (1963: 115, 1973: 394, sub B. melanorrhachis (Rchb.f.) Rchb.f.), Summerhayes
(1968: 241, sub B. melanorrhachis), Sanford (1971: 292), Vermeulen (1987: 127, sub B. falcatum var. velutinum
(Lindl.) J.J.Verm.), Stévart & de Oliveira (2000: 119, sub B. falcatum var. velutinum) and Szlachetko (2008: 166).
Calanthe sylvatica (Thouars) Lindl.
EQUATORIAL GUINEA. Annobón: top of pico del Centro, Wrigley & Melville 161 (MA 293929).
Previously recorded by Mildbraed (1922: 160, sub C. corymbosa Lindl.), Exell (1944: 325, sub C. corymbosa),
Summerhayes (1968: 226, sub C. corymbosa), Sanford (1971: 292, sub C. corymbosa) and Stévart & de Oliveira
(2000: 130).
Wrigley & Melville annotated in the label: “Corolla pink purple, labellum of a much darker blue”. This information
suggests that the specimen from Annobón should be ascribed to var. sylvatica (Stévart 2000: 130).
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Corymborkis corymbis Thouars
Previously recorded by Exell (1963: 114; 1973: 395, sub C. corymbosa (Ridl.) Kuntze) and Stévart & de Oliveira
(2000: 134).
Its presence in Annobón is likely since it grows in most of the islands of the Gulf of Guinea.
Cyrtorchis acuminata (Rolfe) Schltr.
Previously recorded by Mildbraed (1922: 160, sub C. chailluana (Hook.f.) Schltr.), Exell (1944: 335), Guinea
(1968: 134) and Summerhayes (1960: 151).
All the references to this taxon are based on the specimen Mildbraed 6590, examined by Exell at B (now
destroyed). We have failed to find a duplicate at HBG. According to Summerhayes (1960: 151) C. acuminata is a
poorly known species close to C. arcuata (Lindl.) Schltr. It seems that it can be separated by its very broad leaves
and the broad indurated part of the viscidium.
Endemic to Príncipe and Annobón. IUCN category: VU D2 (here proposed).
Cyrtorchis arcuata (Lindl.) Schltr.
EQUATORIAL GUINEA. Annobón: Palé, entre o rio Luba da Que e o arroyo Jada, Carvalho 3130 (MA
716277).
Previously recorded by Stévart & de Oliveira (2000: 141).
This specimen has a spur 47–49 mm long which fits with var. variabilis (Summ.) Geerinck, a taxon widespread
through Tropical Africa (Szlachentko 2008: 278).
Diaphananthe bidens (Sw. ex Pers.) Schltr.
Previously recorded by Szlachentko (2008: 345) without a precise locality.
Its presence in Annobón is likely since it grows in nearby Cameroon and Gabon.
Diaphananthe pellucida (Lindl.) Schltr.
Previously recorded by Mildbraed (1922: 160), Exell (1944: 333), Summerhayes (1968: 261), Sanford (1971:
292), Stévart & de Oliveira (2000: 148) and Szlachetko (2008: 347).
Probably, all the references to this taxon are based on the specimen Mildbraed 6498, examined by Exell at
B (now destroyed). We have failed to find a duplicate at HBG. However, its presence in Annobón is quite likely
since it grows in nearby Cameroon and Gabon.
Disperis reichenbachiana Rchb.f.
EQUATORIAL GUINEA. Annobón: subida al pico Lago desde el lago A Pot, Velayos et al. 11606 (MA
831086).
New record for Annobón (cf. Kurzweil & Manning 2005: 173). Also present in São Tomé but not
previously recorded in Equatorial Guinea.
Epipogium roseum (D.Don) Lindl.
Previously recorded by Exell (1963: 114, 1973: 395), Summerhayes (1968: 207) and Sanford (1971: 293).
Its presence in Annobón is likely as it grows in Cameroon.
Homocolleticon monteiroae (Rchb.f.) Szlach. & Olszewski
Previously recorded by Szlachentko (2008: 290).
Its presence in Annobón is likely since it grows in nearby Cameroon and Gabon.
Liparis nervosa (Thunb.) Lindl.
EQUATORIAL GUINEA. Annobón: cerca del lago A Pot, Velayos et al. 11540 (MA 828460).
Previously recorded by Exell (1944: 322, sub L. guineensis Lindl., 1973: 396), Summerhayes (1968: 214, sub L.
guineensis), Stévart & de Oliveira (2000: 165) and Szlachetko (2008: 124).
Liparis rosseelii Stévart
EQUATORIAL GUINEA. Annobón: subida al pico Lago desde el lago A Pot, Velayos et al. 11596 (MA
828568).
New record for Annobón.
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CHECKLIST OF THE VASCULAR PLANTS OF ANNOBÓN
According to Stévart & Geerinck (2000: 141), L. rosseelii is endemic to São Tomé. The Annobón
specimens have more and bigger leaves.
Liparis welwitschii Rchb.f.
Previously recorded by Exell (1963: 114; 1973: 396).
Its presence in Annobón is likely as it grows in Cameroon.
Nervilia adolphi Schltr.
EQUATORIAL GUINEA. Annobón: subida al pico Lago desde el lago A Pot, Velayos et al. 11602 (MA
831090).
According to Pettersson (1991: 52), the Annobón specimen belongs to the var. adolphi, having the leaf uniformly
green on upper surface. This variety is recorded from Equatorial Guinea by Szlachentko et al. (2004: 97) and
Szlachentko (2008: 101).
New record from Annobón.
Platylepis glandulosa (Lindl.) Rchb.f.
EQUATORIAL GUINEA. Annobón: S of Santa Cruz, also Crater Lake NE side, Wrigley & Melville 184 (MA
294029).
Previously recorded by Exell (1963: 114), Summerhayes (1968: 208), Sanford (1971: 293) and Stévart &
de Oliveira (2000: 178).
Polystachya affinis Lindl.
Previously recorded by Szlachentko (2008: 175) and Exell (1973: 397) without a precise locality. The only
accurate reference is based on Geerinck (1980: 100) [Mont Cacina, Melville 176 (K)]. We do not know any
locality with this name in Annobón. Although Melville 176 was probably collected in Annobón, the same as
Melville 175 and 177.
Polystachya albescens Ridl. subsp. albescens
EQUATORIAL GUINEA. Annobón: ridge W of Crater Lake, Wrigley & Melville 32 (MA 294050).
Uncertain identification due to the poor dry specimen.
Previously recorded by Mildbraed (1922: 160, sub P. epidendroides Schtlr., 1937: 698, sub P. imbricata Rolfe),
Exell (1944: 323, sub P. imbricata), Guinea (1946: 265, sub P. epidendroides), Summerhayes (1968: 221), Sanford
(1971: 293) and Stévart & de Oliveira (2000: 183).
Polystachya ridleyi Rolfe
EQUATORIAL GUINEA. Annobón: S of Crater Lake, Wrigley & Melville 154 (MA 294055).
Recorded by Exell (1963: 115) and Stévart & de Oliveira (2000: 193).
Endemic to Annobón and São Tomé. Uncertain identification due to the poor dry specimen. IUCN
category: VU D2 (here proposed).
Polystachya tessellata Lindl.
EQUATORIAL GUINEA. Annobón: subida al pico Lago desde el lago A Pot, Velayos et al. 11588 (MA
828136).
Previously recorded by Exell (1944: 325), Stévart & de Oliveira (2000: 195) and Szlachetko (2008: 204).
Annobón´s specimen seems to be P. tessellata. Nevertheless, floriferous specimens are needed to assure
the identification.
Zeuxine elongata Rolfe
EQUATORIAL GUINEA. Annobón: S of Crater Lake, Wrigley & Melville 148 (MA 294084).
Previously recorded by Mildbraed (1922: 160), Exell (1944: 320), Summerhayes (1968: 208), Sanford
(1971: 293), Stévart & de Oliveira (2000: 209) and Szlachetko (2008: 86).
D. EUDICOTS
ACANTHACEAE
Asystasia gangetica (L.) T.Anderson
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EQUATORIAL GUINEA. Annobón: pr. Anganchi, Aedo et al. 18056 (MA 831273).
New record for Annobón.
Dicliptera verticillata C.Chr.
EQUATORIAL GUINEA. Annobón: subida al pico Quioveo, Velayos et al. 11638 (MA 843655), 11650 (MA
843666).
Previously recorded by Exell (1963: 108, 1973: 385).
Elytraria marginata Vahl
EQUATORIAL GUINEA. Annobón: valle de Anganchi, Aedo et al. 18072 (MA 831290); subida al pico
Quioveo, Velayos et al. 11641 (MA 843658).
According to Daniel & Figueiredo (2009: 654), it is a very common species in the islands of the Gulf of Guinea
but, not collected in Annobón, till now. The plant that we have collected is caulescent, with short internodes
finished in a rosette of leaves. It differs with E. maritima J.K.Morton in its erect look.
Phaulopsis micrantha (Benth.) C.B.Clarke
EQUATORIAL GUINEA. Annobón: NW of island, Wrigley & Melville 120 (MA 215090).
Previously recorded by Exell (1963: 108) and Manktelow (1996: 158).
The specimen at MA is a dupla of those that identified Manktelow (1996: 157). It matches very well with
key features indicated by this author.
AMARANTHACEAE
Achyranthes aspera L.
EQUATORIAL GUINEA. Annobón: Crater Lake, Wrigley & Melville 192 (MA 192437).
Previously recorded by Exell (1963: 109, 1973: 341).
According with Townsend (1985: 101), the specimen in MA should be var. aspera because it has broadly eliptic
and apiculated leaves and flowers of 4–5 mm long. The other varieties have narrower leaves, with the apex longly
acuminated.
Alternanthera littoralis P.Beauv.
EQUATORIAL GUINEA. Annobón: Palé, junto al hotel de Annobón, Aedo et al. 18090 (MA 831308); playa
Paliá, Velayos et al. 11705 (MA 843646); [no locality], Wrigley & Melville s.n. (MA 215379).
Previously recorded by Mildbraed (1922: 161, sub A. maritima (Mart.) A.St.-Hil.), Exell (1944: 272, sub
Telanthera maritima (Mart.) Moq., 1963: 109, sub A. maritima, 1973: 341, sub A. maritima) and Pedersen (1990:
71, sub var. littoralis). According to Pedersen (1990: 70–71), the specimens in MA should be var. littoralis, due to
its hairy perianth. The same author studied the specimen of Wrigley, and identifies it as var. littoralis. Most likely,
the records of A. maritima, actually correspond with A. littoralis.
Alternanthera sessilis (L.) DC.
EQUATORIAL GUINEA. Annobón: lago A Pot, margen derecha, Carvalho 3153 (MA 512301); E of Ambo,
Wrigley & Melville 205 (MA 215377); near Bird Island, NW coast, Wrigley & Melville 283 (MA 215377).
Previously recorded by Mildbraed (1922: 161), Exell (1944: 272, 1963: 109, 1973: 341) and Fernández-
Casas (1992: 51).
Amaranthus dubius Mart. ex Thell.
EQUATORIAL GUINEA. Annobón: alrededores del hotel de Annobón, Velayos et al. 11478 (MA 828484);
borde del lago A Pot, Velayos et al. 11630 (MA 843647), 11631 (MA 843648).
The records of A. hybridus subps. incurvatus (Gren. & Godr.) Brenan from Bioko (Fernández-Casas 1992: 51) are
A. dubius.
New record for Annobón and the rest of the country, although it is known to grow in Cameroon (Cavaco 1974: 18).
Amaranthus spinosus L.
EQUATORIAL GUINEA. Annobón: San Pedro, Wrigley & Melville 173 (MA 192324).
Previously recorded by Exell (1963: 109, 1973: 341).
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CHECKLIST OF THE VASCULAR PLANTS OF ANNOBÓN
Amaranthus viridis L.
Previously recorded by Exell (1963: 109, 1973: 341). Very plausible as it is known to grow in Bioko and in
other islands of the Guinea Gulf.
Celosia trigyna L.
EQUATORIAL GUINEA. Annobón: Palé, alrededores del aeropuerto, Carvalho 3139 (MA 512003); San
Antonio de Palé, subida al pico do Fogo desde la cantera, Fero et al. 215 (MA 800971); alrededores del hotel de
Annobón, Velayos et al. 11483 (MA 828489); near Ambo, Wrigley & Melville 45 (MA 215371); between
Ambo and pico do Fogo, Wrigley & Melville 8 (MA 215371).
Previously recorded by Mildbraed (1922: 161), Exell (1944: 270, 1973: 342), Townsend (1975: 28) and
Fernández-Casas (1992: 51). The specimens of Wrigley at MA are duplicates of those identified by Townsend
(1975: 28).
Cyathula prostrata (L.) Blume
EQUATORIAL GUINEA. Annobón: borde del lago A Pot, Velayos et al. 11556 (MA 831221); pico Mina
(monte Santa Mina), Wrigley & Melville 174 (MA 215403).
Previously recorded by Exell (1963: 109, 1973: 342).
Pupalia lappacea (L.) A.Juss.
EQUATORIAL GUINEA. Annobón: pr. Anganchi, Aedo et al. 18059 (MA 831276); Pale, arrededores desta
povoacáo, Carvalho 3059 (MA 716276); [no locality], Newton s.n. (LISU 165617); alrededores del hotel de
Annobón, Velayos et al. 11493 (MA 828499); between Ambo and pico de Fogo, Wrigley & Melville 7 (MA
215378).
Previously recorded by Mildbraed (1922: 161), Exell (1944: 271, 1956: 39, 1973: 342) and Sobrinho (1953: 186).
According to Townsend (1979: 135), the specimens at MA are var. velutina (Moq.) Hook.f. because their 8–12
setae, hairy tepals, and velutinous leaves.
ANACARDIACEAE
Lannea welwitschii (Hiern) Engl.
EQUATORIAL GUINEA. Annobón: Palé, alrededores de Dyo Dyo, camino de San Pedro, Carvalho 3116
(MA 555858); Palé–monte Santiago, Carvalho 3156 (MA 716240); camino de Palé a Santa Cruz (Awal), Fero
et al. 248 (MA 800859); subida desde la cantera hacia el lago A Pot, Velayos et al. 11531 (MA 828469).
Previously recorded by Mildbraed (1922: 162), Exell (1944: 145, 1973: 367), Cufodontis (1958a: 470) and Balle
(1964: 30).
According to Kokwaro (1986: 26), the specimens at MA should be var. welwitschii due to its large and glabrous
leaflets.
Mangifera indica L.
EQUATORIAL GUINEA. Annobón: alrededores de Palé, Carvalho 3127 (MA 555857); alrededores del hotel
de Annobón, Velayos et al. 11501 (MA 828509); [no locality], Wrigley 61 (MA 215536).
Previously recorded by Exell (1963: 98, 1973: 367) and Fernández-Casas (1994: 38).
Widely cultivated and naturalized.
Pseudospondias microcarpa (A.Rich.) Engl.
EQUATORIAL GUINEA. Annobón: Palé, lago A Pot, margem direita do lago, Carvalho 3122 (MA 837011);
W shore of Crater Lake, Wrigley 224 (MA 215529).
Previously recorded by Mildbraed (1922: 162) and Exell (1944: 146, 1973: 367).
The specimen at MA (Wrigley 224), according to Fernandes (1973: 14) should be P. microcarpa, with smaller
fruits than P. longifolia Engl. The specimens at MA fits into var. microcarpa for its 4–5 pairs of glabrous leaflets
(Keay 1958a: 729).
Spondias mombin L.
EQUATORIAL GUINEA. Annobón: quebrada del río A Bobo, al SE de Palé, Aedo et al. 18048 (MA 831265);
ensenada de Pala Batelu, Aedo et al. 18083 (MA 831301); entre Palé y San Pedro, en el cruce del río Hahú,
Carvalho 3088 (MA 555859); alrededores del hotel de Annobón, Velayos et al. 11512 (MA 828520); round
Ambo, Wrigley 280 (MA 215488).
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Previously recorded by Mildbraed (1922: 162), Exell (1944: 147, 1973: 368), Keay (1958a: 728) and
Fernández-Casas (1994: 38).
In Fernández-Casas (1994: 38) the reference to this taxon, based on Carvalho 3116, is simply a misidentification of
Lannea welwitschii (Hiern) Engl. S. mombin is easily recognized by the intramarginal nervature, unbranches hairs
and 9 stamens (L. welwitschii has stellated hairs and 8 stamens).
APOCYNACEAE
Allamanda cathartica L.
EQUATORIAL GUINEA. Annobón: Ambo, near the mission, Wrigley & Melville 220 (MA 215694).
Previously recorded by Exell (1963: 104, 1973: 371). Naturalized.
Asclepias curassavica L. [ASCLEPIADACEAE in Fl. Guinea]
EQUATORIAL GUINEA. Annobón: márgenes del lago A Pot, Carvalho 3072 (MA 555860); subida al
Quepuchin desde la ermita de San Juan, Velayos et al. 11673 (MA 843688); Ambo, SW of Church, Wrigley &
Melville 102 (MA 185535).
Previously recorded by Exell (1963: 104, 1973: 372), Fernández-Casas (1994: 41) and Fernández-Casas &
Morales (1995: 235).
Cultivated and naturalized.
Catharanthus roseus (L.) G.Don
EQUATORIAL GUINEA. Annobón: Ambo, Wrigley & Melville 58 (MA 215666).
Previously recorded by Exell (1963: 104, 1973: 371).
Cultivated and naturalized.
Rauvolfia vomitoria Afzel.
EQUATORIAL GUINEA. Annobón: collado de Cus, Aedo et al. 18076 (MA 831294); Palé, entre el río Luba
da Queque y el arroyo Jada, Carvalho 3128 (MA 555660); camino de Palé a Santa Cruz (Awal), Fero et al. 249
(MA 800858); alrededores del hotel de Annobón, Velayos et al. 11506 (MA 828514); borde del lago A Pot,
Velayos et al. 11552 (MA 831217); sendero entre Palé y Aual, Velayos et al. 11703 (MA 843644); Ambo, by
our houses, Wrigley & Melville 140 (MA 215893); ridge W of Crater Lake, Wrigley & Melville 51 (MA
215892).
Previously recorded by Mildbraed (1922: 163), Exell (1944: 239, 1956: 34, 1973: 371), Sobrinho (1953: 185),
Balle (1964: 30), Leeuwenberg (1975: 3) and Dilst & Leeuwenberg (1991: 66).
Dilst & Leeuwenberg (1991) recorded in São Tomé R. mannii Stapf and R. caffra Sonder. They differ from R.
vomitoria in not having indument on the twigs of the inflorescences.
ARALIACEAE
Schefflera mannii (Hook.f.) Harms
EQUATORIAL GUINEA. Annobón: subida al pico Lago desde el lago A Pot, Velayos et al. 11617 (MA
831075); pico del Centro, Wrigley & Melville 236 (MA 215954).
Previously recorded by Mildbraed (1922: 163), Exell (1944: 194, 1973: 368), Guinea (1946: 341), Keay
(1958b: 751) and Bamps (1974: 133).
ASTERACEAE [COMPOSITAE in Fl. Guinea]
Adenostemma perrottetii DC.
EQUATORIAL GUINEA. Annobón: S of Crater Lake, near higher point of crater, Wrigley & Melville 210
(MA 220174).
Previously recorded by Exell (1963: 103, 1973: 378).
Ageratum conyzoides L. subsp. conyzoides
EQUATORIAL GUINEA. Annobón: [no locality], Newton s.n. (LISU 165744); borde del lago A Pot, Velayos
et al. 11565 (MA 828158); Ambo, Wrigley & Melville 24 (MA 221918).
Previously recorded by Exell (1956: 26, 1973: 378) and Sobrinho (1953: 184).
According to Johnson (1971: 26) should be the subsp. conyzoides because its pappus scales of ca. 2 mm
long, apically tapering to a scabrous seta.
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CHECKLIST OF THE VASCULAR PLANTS OF ANNOBÓN
Bidens pilosa L.
EQUATORIAL GUINEA. Annobón: [no locality], Newton s.n. (LISU 165745); subida desde la cantera hacia el
lago A Pot, Velayos et al. 11534 (MA 828466); borde del lago A Pot, Velayos et al. 11564 (MA 828159); N
shore of Crater Lake, Wrigley & Melville 79 (MA 185475).
Previously recorded by Sobrinho (1953: 184) and Exell (1956: 31, 1973: 378).
Eclipta prostrata (L.) L.
EQUATORIAL GUINEA. Annobón: lago A Pot, margen derecha, Carvalho 3154 (MA 587265); Crater Lake,
Wrigley & Melville 180 (MA 185673).
Previously recorded by Mildbraed (1922: 164, sub E. alba (L.) Hassk.), Exell (1944: 226, 1973: 379) and
Fernández-Casas (1996: 135).
Eleutheranthera ruderalis (Sw.) Sch.Bip.
EQUATORIAL GUINEA. Annobón: alrededores del hotel de Annobón, Velayos et al. 11488 (MA 828494);
near Capelle St. Juan, Wrigley & Melville 257 (MA 235767).
Previoulsy recorded by Exell (1963: 103, 1973: 379).
Naturalized.
Emilia praetermissa Milne-Redh.
EQUATORIAL GUINEA. Annobón: San Antonio de Palé, subida al pico do Fogo desde la cantera, Fero et al.
221 (MA 800965); entre el hotel de Annobón y Palé, Velayos et al. 11516 (MA 828524); subida al pico Lago
desde el lago A Pot, Velayos et al. 11587 (MA 828137); cresta del pico Lago, Velayos et al. 11665 (MA
843681).
New record for Annobón. It is widespread throughout tropical Africa (cf. Lisowski (1990: 88), Jeffrey
(1999: 209)).
Mikania chenopodiifolia Willd.
EQUATORIAL GUINEA. Annobón: lago A Pot, margen derecha, Carvalho 3123 (MA 587267); camino de
San Pedro, cerca del puerto nuevo, Velayos et al. 11676 (MA 843691); near Ambo, Wrigley & Melville 27 (MA
244049).
Previously recorded by Exell (1973: 379, sub M. cordata var. cordata), Holmes (1982: 223) and Fernández-Casas
(1996: 138, sub M. cordata).
According to Holmes (1982: 221, 228), M. cordata (Burm.f.) B.L.Rob. is restricted to Asia, therefore African
records should be called M. chenopodiifolia. We agree with Holmes’ identification of Annobón’s plants, based on
Wrigley’s collection. Nevertheless, the specimens we have studied diverge from typical forms in having external
bracts 3–4 mm long, acuminate, some very abruptly. This suggests that the delimitation of species is still unclear in
this group.
Solanecio biafrae (Oliv. & Hiern) C.Jeffrey
EQUATORIAL GUINEA. Annobón: lago A Pot, margen derecha, Carvalho 3148 (MA 587301).
Previously recorded by Exell (1973: 378, sub Crassocephalum biafrae (Oliv. & Hiern) S.Moore) and Fernández-
Casas (1996: 140).
According to Jeffrey (1986: 922) the specimens of Annobón should be placed under the genus Solanecio (style
apex truncated, without appendix), leaving the genus Crassocephalum Moench. (style apex appendiculated) for the
more eastern species (Madagascar, Mascarene Islands and Yemen).
Synedrella nodiflora (L.) Gaertn.
EQUATORIAL GUINEA. Annobón: subida al Quepuchin desde la ermita de San Juan, Velayos et al. 11671 (MA
843686).
Previously recorded by (Exell 1963: 103, 1973: 380).
Vernonia amygdalina Delile
EQUATORIAL GUINEA. Annobón: Palé, alrededores del faro, Carvalho 3065 (MA 587268); subida desde la
cantera hacia el lago A Pot, Velayos et al. 11530 (MA 828470); between Ambo and pico do Fogo, Wrigley &
Melville 6 (MA 246238).
Previously recorded by Mildbraed (1922: 164), Exell (1944: 221, 1973: 380), Cufodontis (1954: 1066),
Adams (1963: 279) and Fernández-Casas (1996: 141).
Very close to V. colorata (Willd.) Drake, from which it differs by its hairy achenes (Isawumi 1995: 91).
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BASELLACEAE
Basella alba L.
EQUATORIAL GUINEA. Annobón: San Pedro and Ambo, Wrigley & Melville 67 (MA 216641).
Previously recorded by Exell (1963: 110, 1973: 342).
Cultivated, eventually naturalized.
BEGONIACEAE
Begonia ampla Hook.f.
EQUATORIAL GUINEA. Annobón: collado de Cus, Aedo et al. 18074 (MA 831292); cumbre del monte
Santiago, Carvalho 3158 (MA 512300); subida al pico Lago desde el lago A Pot, Velayos et al. 11612 (MA
831080); ridge W of Crater Lake, Wrigley & Melville 29 (MA 216731).
Previously recorded by Mildbraed (1922: 163), Exell (1944: 187, 1973: 345), Keay (1954a: 219) and
Fernández-Casas (1992: 72–73).
Begonia annobonensis A.DC.
EQUATORIAL GUINEA. Annobón: Palé, alrededores del faro, Carvalho 3064 (MA 512010); Palé, alturas de
Mol, márgenes del río A Bobo, Carvalho 3097 (MA 512007); camino de Palé a Santa Cruz (Awal), en las
proximidades de punta Palanjana, Fero et al. 266 (MA 800877); roquedos al E del pico do Fogo, Velayos et al.
11662 (MA 843678); subida al Quepuchin desde la ermita de San Juan, Velayos et al. 11674 (MA 843689); S of
Ambo, towards pico do Fogo, Wrigley & Melville 112 (MA 216734); NW of island, Wrigley & Melville 14
(MA 216733).
Previously recorded by Mildbraed (1922: 163), Exell (1944: 187, 1973: 345), Guinea (1946: 334), Keay
(1954a: 220), Fernández-Casas (1992: 73) and Doorenbos et al. (1998: 191).
Despite its specific epithet, it is not endemic to Annobón, growing also in Príncipe, São Tomé and the
coast of Cameroon (Doorembos et al. 1998: 191).
CACTACEAE
Rhipsalis baccifera subsp. mauritiana (DC.) Barthlott
EQUATORIAL GUINEA. Annobón: cumbre del monte Santiago, Carvalho 3159 (MA 512299); southwest
side of lago A Pot, Gascoinge 80 (MA 727192); subida al pico Lago desde el lago A Pot, Velayos et al. 11589
(MA 828135); subida al pico Quioveo, Velayos et al. 11634 (MA 843651); ridge W of Crater Lake, Wrigley &
Melville 54 (MA 219596).
Previously recorded by Mildbraed (1922: 163, sub R. cassytha Gaertn.), Exell (1944: 192, sub R. cassytha, 1973:
346) and Fernández-Casas (1992: 73).
According to Barthlott (1987: 1995), it seems to be subsp. mauritiana (DC.) Barthlott for its white fruit (not red as
in subsp. erythrocarpa (K.Schum.) Barthlott, from mountains of Kenia and Tanzania.
CAMPANULACEAE
Wahlenbergia perrottetii (A.DC.) Thulin
EQUATORIAL GUINEA. Annobón: pico de Fogo, Wrigley & Melville 90 (MA 212854).
Previously recorded by Exell (1973: 380, sub Cephalostigma perrottetii A.DC.) and Thulin (1975: 201).
CAPPARACEAE
Cleome rutidosperma DC.
EQUATORIAL GUINEA. Annobón: Palé, Carvalho 3058 (MA 512011); [no locality], Newton s.n. (LISU
165619); alrededores del hotel de Annobón, Velayos et al. 11486 (MA 828492); NW of island, Wrigley &
Melville 129 (MA 200579).
Previously recorded by Mildbraed (1922: 161, sub C. ciliata Schumach. & Thonn.), Exell (1944: 106, sub C.
ciliata, 1956: 10, sub C. ciliata, 1963: 96, 1973: 339), Sobrinho (1953: 179, sub C. ciliata) and Fernández-Casas
(1992: 56).
CARICACEAE
Carica papaya L.
EQUATORIAL GUINEA. Annobón: Crater Lake, Wrigley & Melville 182 (MA 220948).
Previously recorded by Exell (1963: 100, 1973: 346).
Cultivated, eventually naturalized.
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CHECKLIST OF THE VASCULAR PLANTS OF ANNOBÓN
CELASTRACEAE
Maytenus annobonensis (Loes. & Mildbr.) Exell
EQUATORIAL GUINEA. Annobón: ridge W of Crater Lake, Wrigley 56 (MA 220892).
Previously recorded by Exell (1944: 139, sub Gymnosporia annobonensis Loes. & Mildbr., 1963: 97, 1973: 364),
Guinea (1946: 315, sub G. annobonensis, 1968: 134).
The type (Mildbraed 6541) was probably destroyed in B. So the single specimen known from this species is
Wrigley 56. The duplicate at MA is a steril specimen.
Endemic to Annobón.
IUCN category: CR A2ac; B2ab (here proposed).
COMBRETACEAE
Terminalia catappa L.
EQUATORIAL GUINEA. Annobón: ensenada de Pala Batelu, Aedo et al. 18079 (MA 831297).
Previously recorded by Exell (1963: 100, 1973: 348).
Naturalized.
CONNARACEAE
Agelaea pentagyna (Lam.) Baill.
EQUATORIAL GUINEA. Annobón: Ambo, Melville 232 (MA 222191); Quioveo, Mildbraed 6606, 6680
(HBG); [no locality], Mildbraed 6679 (HBG).
Previously recorded by Mildbraed (1922: 161, sub A. annobonensis G.Schellenb., A. ovalis G.Schellenb., 1937:
699–700, sub A. annobonensis, A. ovalis), Exell (1944: 147–148, sub A. annobonensis, A. ovalis, 1963: 98, sub A.
ovalis, 1973: 368, sub A. annobonensis, A. ovalis), Guinea (1946: 288, sub A. annobonensis, A. ovalis, 1968: 134,
sub A. ovalis), Brenan (1979: 464, sub A. annobonensis), Jongkind (1989: 151) and Breteler (1989: 147).
According to Breteler (1989: 147), A. annobonensis is a heterotypic synonym of A. pentagyna. He supposed that
the original material was destroyed at B, so he chose a neotypus (Wrigley & Melville 232 (K) with an isoneotypus
at MA), but there are syntypes in HBG (Mildbraed 6680). The same author, in Breteler (1989: 148), proposes that
A. ovalis is also a heterotypic synonym of A. pentagyna. A. ovalis was originally described from Annobón
(Mildbraed 6606, 6679). Breteler supposed that the unique syntypes were destroyed at B, so he chose a neotype
from Gabon. In this case as well, both syntypes (Mildbraed 6606, 6679) are kept at HBG.
CONVOLVULACEAE
Ipomoea alba L.
Previously recorded by Exell (1963: 105, 1973: 382).
Naturalized.
Ipomoea eriocarpa R.Br.
EQUATORIAL GUINEA. Annobón: [no locality], Newton s.n. (LISU 165654).
Previously recorded by Sobrinho (1953: 185) and Exell (1956: 35).
Ipomoea involucrata P.Beauv.
Previously recorded by Exell (1963: 105; 1973: 382).
The presence in Annobón seems plausible since it is present in nearest areas.
Ipomoea mauritiana Jacq.
EQUATORIAL GUINEA. Annobón: camino de Palé a Santa Cruz (Awal), junto al arroyo Jada, Fero et al. 258
(MA 800851); subida al pico Lago desde el lago A Pot, Velayos et al. 11595 (MA 828567), 11607 (MA
831085); sendero entre Aual y Mábana, Velayos et al. 11694 (MA 843635); Crater Lake, Wrigley & Melville
206 (MA 185281).
Previously recorded by Exell (1963: 106, 1973: 382).
Ipomoea nil (L.) Roth
EQUATORIAL GUINEA. Annobón: quebrada del río A Bobo, al SE de Palé, Aedo et al. 18051 (MA 831268);
Palé, junto a la iglesia del lado del mar, Carvalho 3061 (MA 558409); borde de la carretera entre el hotel de
Annobón y Palé, Velayos et al. 11517 (MA 828525); S of Administrator's house and just behind our houses,
Wrigley & Melville 103 (MA 185280).
Previously recorded by Exell (1963: 106, 1973: 382) and Wilkin (1994: 9).
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Ipomoea pes-caprae subsp. brasiliensis (L.) Oost.
EQUATORIAL GUINEA. Annobón: Palé, junto al cementerio, Aedo et al. 18077 (MA 831295); [no locality],
Newton s.n. (LISU 165655); Ambo, near cemetery, Wrigley & Melville 158 (MA 185279).
Previously recorded by Exell (1973: 383).
CRASSULACEAE
Bryophyllum pinnatum (Lam.) Oken
EQUATORIAL GUINEA. Annobón: márgenes del lago A Pot, Carvalho 3078 (MA 511929); borde del lago A
Pot, Fero et al. 237 (MA 800869); between Ambo and pico de Fogo, Wrigley & Melville 3 (MA 222801).
Previously recorded by Mildbraed (1922: 161, sub B. calycinum Salisb.), Exell (1944: 174, 1973: 340) and
Fernández-Casas (1992: 57).
Kalanchoe crenata Haw. subsp. crenata
EQUATORIAL GUINEA. Annobón: ridge of crater, Wrigley & Melville 100 (MA 222817); Ambo, near shore,
Wrigley & Melville 235 (MA 222818).
Previously recorded by Exell (1963: 99, 1973: 340).
According to Wickens (1987: 45) the plants of Annobón should be identified as subsp. crenata.
CUCURBITACEAE
Cayaponia africana (Hook.f.) Exell
EQUATORIAL GUINEA. Annobón: márgenes río San Juan, Newton s.n. (LISU 165743); W shore of Crater
Lake, Wrigley & Melville 87 (MA 234984).
Previously recorded by Sobrinho (1953: 184), Jeffrey (1971: 225), Exell (1973: 344) and Morales (1995b:
41–43).
Lagenaria breviflora (Benth.) Roberty
EQUATORIAL GUINEA. Annobón: Palé, alrededores del campo de fútbol, Carvalho 3105 (MA 555725);
Ambo, Wrigley & Melville 19 (MA 235035).
Previously recorded by Exell (1963: 101, 1973: 345) and Morales (1995b: 41).
Lagenaria siceraria (Molina) Standley
EQUATORIAL GUINEA. Annobón: Ambo, village, Wrigley & Melville 302 (MA 235037).
Previously recorded by Exell (1963: 101, 1973: 345) and Morales (1995b: 43).
Luffa cylindrica (L.) Roem.
EQUATORIAL GUINEA. Annobón: entre el hotel de Annobón y Palé, Velayos et al. 11522 (MA 828477);
Ambo, near our houses, Wrigley & Melville 133 (MA 235040); San Pedro, Wrigley & Melville 229 (MA
235039).
Previously recorded by Exell (1963: 101, sub L. aegyptiaca Mill., 1973: 345, sub L. aegyptiaca Mill.) and Morales
(1995b: 43–45, sub L. aegyptiaca Mill.).
Naturalized.
Momordica charantia L.
EQUATORIAL GUINEA. Annobón: alrededores del hotel de Annobón, Velayos et al. 11489 (MA 828495).
Previously recorded by Exell (1973: 345) and Morales (1995b: 45).
ERYTHROXYLACEAE
Erythroxylum emarginatum Thonn.
EQUATORIAL GUINEA. Annobón: [no locality], Newton s.n. (LISU 165637).
Previously recorded by Sobrinho (1953: 180) and Exell (1956: 12, 1973: 352).
EUPHORBIACEAE
Acalypha annobonae Pax & K.Hoffm.
EQUATORIAL GUINEA. Annobón: Quioveo, Aufstieg, Mildbraed 6538 (HBG 516683); ridge W of Crater
Lake, Wrigley & Melville 55 (BM, K, MA 189279).
Previously recorded by Mildbraed (1922: 162, sub Acalypha sp., 1937: 700), Exell (1944: 299, 1963: 113,
1973: 352), Guinea (1946: 312) and Barberá et al. (2013: 6).
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CHECKLIST OF THE VASCULAR PLANTS OF ANNOBÓN
Exell (1963: 113) thought that the original material was lost, so he considered the specimen Wrigley 55
(BM, K, MA) as almost a topotype. The original material, Mildbraed 6538, was destroyed in Berlin Herbarium
but there is a duplicate in HBG.
Endemic to Annobón.
IUCN category: CR A2ac; B2ab (here proposed).
Antidesma vogelianum Müll.Arg.
EQUATORIAL GUINEA. Annobón: collado de Cus, Aedo et al. 18075 (MA 831293); Palé–Alturas de Mol,
margens do rio a Bobo (San Juan), Carvalho 3140 (MA 837015); borde del lago A Pot, Fero et al. 236 (MA
800870); subida al pico Lago desde el lago A Pot, Velayos et al. 11597 (MA 828569), 11599 (MA 828571),
11615 (MA 831078); subida al Quepuchin desde la ermita de San Juan, Velayos et al. 11672 (MA 843687).
Previously recorded by Exell (1944: 286, sub A. membranaceum Müll.Arg., 1973: 352, sub A. membranaceum)
and Léonard (1988: 27).
Until Keay (1958: 375), A. vogelianum and A. membranaceum Müll.Arg. were confused because of the fruit size.
The specimens studied from Annobón have acuminated and glabrous leaves, some with 20 cm long and hairy
nerves. According to Léonard (1988: 22), those characters should correspond to A. vogelianum.
Bridelia micrantha (Hochst.) Baill.
EQUATORIAL GUINEA. Annobón: subida al pico Quioveo, Velayos et al. 11640 (MA 843657); Santa Cruz,
Wrigley & Melville 245 (MA 250570).
Previously recorded by Mildbraed (1922: 162, sub B. stenocarpa Müll.Arg.), Exell (1944: 286, 1973: 352, sub B.
stenocarpa) and Cufodontis (1956: 418).
Cavacoa quintasii (Pax & K.Hoffm.) J. Léonard
EQUATORIAL GUINEA. Annobón: Palé–Alturas de Mol, margens do rio A Bobo, Carvalho 3098 (MA
837018); lago A Pot, margen izquierda, Carvalho 3118 (MA 512294); subida al pico Lago desde el lago A Pot,
Velayos et al. 11593 (MA 828565).
Previously recorded by Mildbraed (1922: 162, sub Grossera quintasii Pax & K.Hoffm.), Exell (1944: 294, sub G.
quintasii, 1973: 352), Léonard (1955: 323) and Guinea (1968: 134).
Codiaeum variegatum (L.) Blume
Previously recorded by Exell (1963: 112, 1973: 352).
The presence in Annobón seems plausible.
Naturalized.
Discoclaoxylon pubescens (Pax & K.Hoffm.) Exell
EQUATORIAL GUINEA. Annobón: Nordkrater, Mildbraed 6492 (HBG 516369); Quioveo, Mildbraed 6555
(HBG 516370, 516371); subida al pico Quioveo, Velayos et al. 11648 (MA 843664); subida a Santa Mina desde
San Pedro, Velayos et al. 11690 (MA 843631); highest part of crater, Wrigley & Melville 96 (BM, K, MA
250173).
Previously recorded by Mildbraed (1922: 162, sub D. occidentale (Müll.Arg.) Pax & K.Hoffm.), Exell (1944: 299,
sub D. occidentale var. pubescens Pax & K.Hoffm., 1963: 112, 1973: 353),68: 134) and Barberá et al. (2013: 10,
2013b).
The specimens studied have 5 male flowers to each bract with 12 stamens, the base of the midrid and the petioles
are densely hairy; the pedicel of the flowers expanded is about 5–6 mm. long (Barberá et al., 2014). According to
Exell (1963: 112) this characters justify the separation from D. occidentale, endemic to São Tomé.
Endemic to Annobón.
IUCN category: EN A2ac; B2ab (here proposed).
Discoglypremna caloneura (Pax) Prain
EQUATORIAL GUINEA. Annobón: valle de Anganchi, Aedo et al. 18068 (MA 831286); borde del lago A Pot,
Fero et al. 229 (MA 800957); camino de Palé a Santa Cruz (Awal), junto al arroyo Jada, Fero et al. 262 (MA
800847); centro, Wrigley 288 (BM).
Previously recorded by Mildbraed (1922: 162, sub var. membranacea Pax), Exell (1944: 300, 1973: 353), Léonard
(1995: 207) and Barberá et al. (2013: 10).
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Euphorbia hirta L.
EQUATORIAL GUINEA. Annobón: Pale, arrededores desta povoacáo, Carvalho 3056 (MA 658450);
alrededores del hotel de Annobón, Velayos et al. 11485 (MA 828491); pico do Fogo, Wrigley & Melville 189
(MA 192558).
Previously recorded by Mildbraed (1922: 162) and Exell (1944: 284, 1973: 353).
Euphorbia hyssopifolia L.
EQUATORIAL GUINEA. Annobón: alrededores del hotel de Annobón, Velayos et al. 11481 (MA
828487), 11514 (MA 828522).
New record for Annobón.
Euphorbia prostrata Aiton
EQUATORIAL GUINEA. Annobón: margens da lagoa, Newton s.n. (LISU 165642).
Previously recorded by Sobrinho (1953: 186) and Exell (1956: 41, 1973: 353).
Euphorbia pulcherrima Willd. ex Klotzsch
EQUATORIAL GUINEA. Annobón: Santa Cruz, Wrigley & Melville 269 (MA 192553).
Previously recorded by Exell (1963: 111, 1973: 353).
Cultivated and probably naturalized.
Euphorbia thymifolia L.
EQUATORIAL GUINEA. Annobón: Palé, arrededores desta povoacáo, Carvalho 3057 (MA 716278);
Strandfelsen in Norden, Mildbraed 6645 (HBG 516158).
Previously recorded by Mildbraed (1922: 162, sub E. aegyptiaca var. annobonensis Mildbr., 1937: 700) and Exell
(1944: 285, 1973: 353).
Jatropha curcas L.
EQUATORIAL GUINEA. Annobón: Palé, alrededores del aeropuerto, Carvalho 3136 (MA 555856);
proximidades del hotel de Annobón, Fero et al. 245 (MA 800862); camino de Palé a Santa Cruz (Awal), Fero
et al. 247 (MA 800860), 250 (MA 800857), 252 (MA 800855); alrededores del hotel de Annobón, Velayos et
al. 11513 (MA 828521); subida al pico Lago desde el lago A Pot, Velayos et al. 11584 (MA 828140); N of
island, Wrigley & Melville 17 (MA 250994).
Previously recorded by Mildbraed (1922: 162), Exell (1944: 293, 1973: 353), Sobrinho (1953: 187) and
Fernández-Casas (1994: 37).
Cultivated and naturalized.
Phyllanthus amarus Schumach. & Thonn.
EQUATORIAL GUINEA. Annobón: Palé, arredores do farol, Carvalho 3068 (MA 716273); [no locality],
Newton s.n. (LISU 165639); subida al Quepuchin desde la ermita de San Juan, Velayos et al. 11675 (MA
843690); Crater Lake, NW side, Wrigley & Melville 178 A (MA 251196).
Previously recorded by Sobrinho (1953: 186) and Exell (1956: 42, 1973: 354).
Phyllanthus pentandrus Schumach. & Thonn.
EQUATORIAL GUINEA. Annobón: ensenada de Pala Batelu, Aedo et al. 18086 (MA 831304); San Antonio
de Palé, subida al pico do Fogo desde la cantera, Fero et al. 222 (MA 800964); base de pico de S. Estephania,
Newton s.n. (LISU 165610); alrededores del hotel de Annobón, Velayos et al. 11499 (MA 828505).
Previously recorded by Mildbraed (1922: 162) and Exell (1944: 290, 1956: 42, 1973: 354).
Phyllanthus reticulatus Poir.
Previously reported from Annobón by Exell (1963: 111, 1973: 354), based on the specimen Melville 212 (BM).
This widespread African species has been reported in Cameroon, Congo and Nigeria (Lebrun & Stork
2006: 215). The distribution range of this species suggests that its presence in Annobón is plausible.
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CHECKLIST OF THE VASCULAR PLANTS OF ANNOBÓN
Thecacoris trichogyne Müll.Arg.
EQUATORIAL GUINEA. Annobón: Quioveo, Mildbraed 6557 (HBG 515450); subida al pico Quioveo,
Velayos et al. 11643 (MA 843660); pico Surcado, Wrigley & Melville 66 (MA 251357); near highest part of
crater, Wrigley & Melville 92 (MA 251356).
Previously recorded by Mildbraed (1922: 162, sub T. annobonae Pax & K.Hoffm., 1937: 700, sub T. annobonae),
Exell (1944: 287, sub T. annobonae, 1963: 111, sub T. annobonae, 1973: 354, sub T. annobonae) and Hedrén
(1988: 134, sub T. annobonae).
According to Breteler (2011: 343), Mildbraed 6557 (HBG) is the only duplicate existing of the three syntypes and
was designated as the lectotype of T. annobonae by him.
IUCN category of Th. annobonae. EN A2c
FABACEAE–CAESALPINIOIDEAE [LEGUMINOSAE–CAESALPINIOIDEAE in Fl. Guinea]
Caesalpinia pulcherrima (L.) Sw.
EQUATORIAL GUINEA. Annobón: Ambo, Mission, Melville 233 (K).
Previously recorded by Exell (1963: 99, 1973: 356) and Estrella et al. (2006: 546).
This American species has become naturalized in many African countries (Vidigal 2002: 10).
Cynometra mannii Oliv.
EQUATORIAL GUINEA. Annobón: [no locality], Newton s.n. (LISU 165620).
Previously recorded by Sobrinho (1953: 183), Exell (1956: 18) and Estrella et al. (2006: 547).
Guilandina bonduc L.
EQUATORIAL GUINEA. Annobón: ensenada de Pala Batelu, Aedo et al. 18080 (MA 831298); entre Palé y el
aeropuerto, Carvalho 3080 (MA 525864, WAG); [no locality], Newton s.n. (LISU 165622); Ambo, Wrigley 39
(MA 188715).
Previously recorded by Sobrinho (1953: 183, sub Caesalpinia bonduc (L.) Roxb.), Exell (1956: 17, sub C. bonduc,
1973: 356, sub C. bonduc), Fernández-Casas (1992: 60, sub C. bonduc) and Estrella et al. (2006: 545, sub C.
bonduc).
Senna obtusifolia (L.) H.S.Irwin & Barneby
EQUATORIAL GUINEA. Annobón: camino del lago A Pot, cerca del lago, Velayos et al. 11571 (MA
828152); between St. Juan Cappelle and San Pedro, Wrigley 230A (BM, MA 188750).
Previously recorded by Exell (1963: 99, sub Cassia obtusifolia L., 1973: 356, sub C. obtusifolia) and Estrella et al.
(2006: 553).
Naturalized.
Senna occidentalis (L.) Link
EQUATORIAL GUINEA. Annobón: camino del lago A Pot, cerca del lago, Velayos et al. 11572 (MA
828151); between San Juan Cappelle and San Pedro, Wrigley 230 (K, MA 188745).
Previously recorded by Exell (1963: 99, sub Cassia occidentalis L., 1973: 357, sub C. occidentalis) and Estrella et
al. (2006: 554).
Naturalized.
Senna septemtrionalis (Viv.) H.S.Irwin & Barneby
Previously recorded by Exell (1973: 356, sub Cassia laevigata Willd.) and Estrella et al. (2006: 554).
Naturalized.
Tamarindus indica L.
EQUATORIAL GUINEA. Annobón: Palé, alrededores de faro, Carvalho 3067 (BM, K, MA 525863, WAG);
alrededores del hotel de Annobón, Velayos et al. 11511 (MA 828519), subida desde la cantera hacia el lago A
Pot, Velayos et al. 11532 (MA 828468); lago A Pot, Velayos et al. 11568 (MA 828156); near Ambo, Wrigley
255 (MA 264494).
Previously recorded by Mildbraed (1922: 161), Exell (1944: 168, 1973: 360), Fernández-Casas (1992: 60)
and Estrella et al. (2006: 555).
Naturalized.
FABACEAE–MIMOSOIDEAE [LEGUMINOSAE–MIMOSOIDEAE in Fl. Guinea]
Parkia biglobosa (Jacq.) R.Br. ex G.Don
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EQUATORIAL GUINEA. Annobón: [no locality], Newton s.n. (LISU 165621).
Previously recorded by Sobrinho (1953: 183, sub P. oliveri J.F.Macbr.), Exell (1956: 18, sub P. oliveri, 1973: 359,
sub P. oliveri) and Estrella et al. (2005: 16).
We have identified the previously mentioned sterile specimen as P. biglobosa because it has 11–12 pairs of pinnae,
13–38 subopposite leaflets pairs (7–15 × 1.5–3 mm), with a straight main nerve, and a single, orbicular gland at
petiole base as well as greyish pubescence along the main rachis (Hopkins 1983: 141–148, Hall et al. 1997: 6).
This identification is also in accordance with the label included by M.C. Liberato in the specimen at LISU,
although under the name P. africana R. Br. (synonym of the currently accepted name P. biglobosa).
Naturalized. Hall et al. (1997: 20) suggested that this species could be present in Annobón and neighbouring
Cameroon and São Tomé, as a result of introductions.
Pentaclethra macrophylla Benth.
Previously recorded by Oliver (1871: 322–323), Exell (1973: 359) and Estrella et al. (2005: 17).
The presence of this species in Annobon seems plausible since it is present in nearest areas.
FABACEAE– PAPILIONOIDEAE [LEGUMINOSAE– PAPILIONOIDEAE in Fl. Guinea]
Abrus precatorius L.
EQUATORIAL GUINEA. Annobón: Palé, alrededores del aeropuerto, Carvalho 3137 (MA 525897); near
crater lake, Exell 898 (BM); [no locality], Newton s.n. (LISU 165632); alrededores del hotel de Annobón,
Velayos et al. 11495 (MA 828501); subida desde la cantera hacia el lago A Pot, Velayos et al. 11536 (MA
828464); sendero entre Palé y Aual, Velayos et al. 11699 (MA 843640); between Ambo and pico de Fogo,
Wrigley 5 (BM, K, MA 259521).
Previously recorded by Mildbraed (1922: 162), Exell (1944: 159, 1956: 16; 1973: 355), Sobrinho (1953:
182), Fernández-Casas (1992: 59) and Estrella et al. (2010: 4).
Alysicarpus vaginalis (L.) DC.
EQUATORIAL GUINEA. Annobón: base do pico de S. Estephânia, Newton s.n. (LISU 165630).
Previously recorded by Exell (1956: 16, 1973: 356) and Estrella et al. (2010: 6).
Cajanus cajan (L.) Huth
EQUATORIAL GUINEA. Annobón: Palé, arredores desta povoacao, Carvalho 3166 (K, MA 713440); near
Ambo, Wrigley 76 (BM, K).
Previously recorded by Exell (1963: 99, 1973: 356) and Estrella et al. (2010: 10).
Introduced and naturalized.
Canavalia rosea (Sw.) DC.
EQUATORIAL GUINEA. Annobón: Palé, junto al hotel de Annobón, Aedo et al. 18091 (MA 831309); Ambo,
Wrigley 16 (BM, K, MA 188708).
Previously recorded by Mildbraed (1922: 162, sub C. obtusifolia (Lam.) DC.), Exell (1944: 160, 1973: 356, sub C.
maritima (Aubl.) Thouars) and Estrella et al. (2010: 11).
Crotalaria pallida Aiton
Previously recorded by Sobrinho (1953: 181, sub C. mucronata Desv.), Exell (1956: 14, sub C. mucronata, 1973:
357, sub C. mucronata) and Estrella et al. (2010: 13).
The presence of this species in Annobón seems plausible since it is present in nearest areas.
Crotalaria retusa L.
EQUATORIAL GUINEA. Annobón: alrededores del hotel de Annobón, Velayos et al. 11473 (MA 828479);
sendero entre Palé y Aual, cruce del río Jada, Velayos et al. 11702 (MA 843643).
New record for Annobón.
Dalbergia ecastaphyllum (L.) Taub.
EQUATORIAL GUINEA. Annobón: [no locality], Mildbraed 6646 (HBG).
Previously recorded by Mildbraed (1922: 162, 184, sub Ecastaphyllum brownei Pers.), Exell (1944: 164, 1973:
357) and Estrella et al. (2010: 14).
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CHECKLIST OF THE VASCULAR PLANTS OF ANNOBÓN
Desmodium adscendens (Sw.) DC.
EQUATORIAL GUINEA. Annobón: [no locality], Melville 209 (BM, MA 188411); subida desde la cantera
hacia el lago A Pot, Velayos et al. 11527 (MA 828473).
Previously recorded by Mildbraed (1922: 162), Exell (1944: 156, 1973: 357, sub var. adscendens) and Estrella et
al. (2010: 17).
Desmodium gangeticum (L.) DC.
EQUATORIAL GUINEA. Annobón: San Antonio de Palé, subida al pico do Fogo desde la cantera, Fero et al.
219 (MA 800967); subida desde la cantera hacia el lago A Pot, Velayos et al. 11526 (MA 828474), 11537 (MA
828463); between Ambo and pico do Fogo, Wrigley 4 (MA 188414).
Previously recorded by Mildbraed (1922: 162), Cufodontis (1955a: 299), Exell (1944: 157, 1973: 357) and
Estrella et al. (2010: 17).
Desmodium incanum DC.
EQUATORIAL GUINEA. Annobón: margem direita do lago A Pot, Carvalho 3119 (MA 656653); N da ilha,
base pico S. Stephania, sul da ilha, Newton s.n. (LISU 165627); cerca del lago A Pot, Velayos et al. 11575 (MA
828149), 11578 (MA 828146); sendero entre Palé y Aual, Velayos et al. 11704 (MA 843645).
Previously recorded by Mildbraed (1922: 162), Exell (1944: 156, sub D. canum (J.F.Gmel.) Schinz & Thell., 1956:
15, sub D. canum, 1973: 357, sub D. canum) and Estrella et al. (2010: 18).
Desmodium ospriostreblum Chiov.
EQUATORIAL GUINEA. Annobón: quebrada del río A Bobo, al SE de Palé, Aedo et al. 18046 (MA 831263),
18047 (MA 831264); [no locality], Exell 900 (BM); path towards pico do Fogo and Crater Lake, Melville 108
(BM, MA 188416); base do pico de S. Estephania, Newton s.n. (LISU 165628).
Previously recorded by Exell (1944: 158, 1956: 16, sub D. procumbens (Mill.) Hitchc., 1973: 357, sub D.
procumbens), Sobrinho (1953: 182) and Estrella et al. (2010: 18).
Desmodium ramosissimum G.Don
EQUATORIAL GUINEA. Annobón: San Antonio de Palé, subida al pico do Fogo desde la cantera, Fero et al.
218 (MA 800968); path towards pico do Fogo and Crater Lake, Melville 105 (BM, K, MA 188417); alrededores
del hotel de Annobón, Velayos et al. 11484 (MA 828490).
Previously recorded by Exell (1963: 98, 1973: 357) and Estrella et al. (2010: 18).
Desmodium salicifolium (Poir.) DC.
EQUATORIAL GUINEA. Annobón: cerca del lago A Pot, M. Velayos et al. 11577 (MA 828147).
New record for Annobón.
Desmodium tortuosum (Sw.) DC.
EQUATORIAL GUINEA. Annobón: Palé, arredores de Dyo Dyo, camino de San Pedro, Carvalho 3113 (K,
MA 711349).
Previously recorded by Estrella et al. (2010: 19).
Naturalized.
Desmodium velutinum (Willd.) DC.
EQUATORIAL GUINEA. Annobón: nas margens do lago A Pot, Carvalho 3077 (MA 713437); sul da ilha,
Newton s.n. (LISU 165629).
Previously recorded by Sobrinho (1953: 182, sub D. latifolium DC.), Exell (1956: 16, 1973: 358) and Estrella et al.
(2010: 19).
Eriosema glomeratum (Guill. & Perr.) Hook.f.
EQUATORIAL GUINEA. Annobón: Palé–pico do Fogo, Carvalho 3081 (K, MA 713438); San Antonio de
Palé, subida al pico do Fogo desde la cantera, Fero et al. 223 (MA 800963); near Ambo, Wrigley 46 (BM, K,
MA 261645).
Previously recorded by Exell (1963: 99, 1973: 358) and Estrella et al. (2010: 20).
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Erythrina velutina Willd.
EQUATORIAL GUINEA. Annobón: quebrada del río A Bobo, al SE de Palé, Aedo et al. 18050 (MA 831267);
Palé–San Pedro, Carvalho 3087 (K, MA 713439); Ambo, by our houses, Melville 143 (MA 261674).
Previously recorded by Mildbraed (1922: 162), Exell (1944: 159, 1973: 358) and Estrella et al. (2010: 23).
Naturalized.
Indigofera spicata Forssk.
EQUATORIAL GUINEA. Annobón: [no locality], Burton s.n. (K); Palé, arredores desta povoacao, Carvalho
3162 (K, MA 713434); NW corner of island, Melville 126 (K, MA 192607); N da ilha, Newton s.n. (LISU
165624); alrededores del hotel de Annobón, Velayos et al. 11490 (MA 828496).
Previously recorded by Mildbraed (1922: 161, sub I. hendecaphylla Jacq.), Exell (1944: 152, sub I. hendecaphylla,
1956: 15; 1973, 358), Sobrinho (1953: 181, sub I. hendecaphylla), Cufodontis (1955b: 265, sub I. hendecaphylla),
Du Puy et al. (1993: 732, sub I. hendecaphylla) and Estrella et al. (2010: 24).
Naturalized.
Indigofera suffruticosa Mill.
Previously recorded by Mildbraed (1922: 161, sub I. anil L.).
It is naturalized in the rest of the country, so its presence in Annobón is quite plausible
Indigofera tinctoria L.
EQUATORIAL GUINEA. Annobón: Palé, arredores do cemiterio, Carvalho 3103 (K, MA 656652, WAG);
Ambo, bathing beach, Melville 159 (BM, K, MA 192608); San Pedro, Newton s.n. (LISU 165625).
Previously recorded by Exell (1944: 153, 1956: 15, 1973: 358), Sobrinho (1953: 181), Cufodontis (1955a:
276) and Estrella et al. (2010: 25).
Lonchocarpus sericeus (Poir.) Kunth ex DC.
EQUATORIAL GUINEA. Annobón: Palé, margens do rio Luba da Queque, Carvalho 3146 (K, MA 713432).
Previously recorded by Estrella et al. (2010: 27).
Mucuna sloanei Fawc. & Rendle
EQUATORIAL GUINEA. Annobón: río Ajob (Jobo), Carvalho 3134 (K, MA 525866); Palé, margen derecha
del lago A Pot, Carvalho 3164 (MA 525898, 533550); borde del lago A Pot, Velayos et al. 11554 (MA
831219); Ambo, Wrigley 30 (K, MA 189213).
Previously recorded by Mildbraed (1922: 162, sub M. urens DC.), Exell (1944: 160, sub M. urens, 1963: 98, 1973:
359), Fernández-Casas (1992: 60) and Estrella et al. (2010: 32).
Phaseolus lunatus L.
EQUATORIAL GUINEA. Annobón: Palé, frente á Igreja do lado do mar, Carvalho 3062 (K, MA 713436);
borde del lago A Pot, Fero et al. 234 (MA 800872); SW of Crater Lake, Melville 199 (K).
Previously recorded by Oliver (1871: 192), Exell (1944: 161, 1973: 359), Cufodontis (1955a: 330) and
Estrella et al. (2010: 33).
Cultivated and locally naturalized.
Rhynchosia minima (L.) DC.
EQUATORIAL GUINEA. Annobón: campos na base E do pico Santa Estephania, Newton s.n. (LISU 165634).
Previously recorded by Sobrinho (1953: 182, sub R. memnonia (Delile) DC.), Exell (1956: 17, sub R. memnonia,
1973: 360) and Estrella et al. (2010: 37).
Sesbania sericea (Willd.) Link
EQUATORIAL GUINEA. Annobón: hogares alagadiços, perto do mar, Newton s.n. (LISU 165626); Lago A
Pot, Velayos et al. 11567 (MA 828155); Ambo, Wrigley 43 (K, MA 189166).
Previously recorded by Mildbraed (1922: 161, sub S. pubescens DC.), Exell (1944: 155, sub S. pubescens, 1956:
15, sub S. pubescens, 1973: 360), Sobrinho (1953: 181, sub S. pubescens), Cufodontis (1955a: 287, sub S.
pubescens) and Estrella et al. (2010: 37).
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CHECKLIST OF THE VASCULAR PLANTS OF ANNOBÓN
Teramnus labialis (L.f.) Spreng.
EQUATORIAL GUINEA. Annobón: [no locality], Burton s.n. (K); Palé, alturas de Mol, márgenes del río
Abobo, Carvalho 3095 (K, MA 525865, WAG); San Antonio de Palé, subida al pico do Fogo desde la cantera,
Fero et al. 213 (MA 800973); towards pico do Fogo, S of Ambo, Melville 109 (K, MA 264553); pico Santa
Estephania, Newton s.n. (LISU 165633).
Previously recorded by Mildbraed (1922: 162), Exell (1944: 159, 1956: 16; 1973: 360), Sobrinho (1953:
182), Verdcourt (1970: 273), Fernández-Casas (1992: 60) and Estrella et al. (2010: 39).
Uraria picta (Jacq.) Desv. ex DC.
EQUATORIAL GUINEA. Annobón: N da ilha, Newton s.n. (LISU 165631).
Previously recorded by Exell (1956: 16, 1973: 360) and Estrella et al. (2010: 40).
Vigna unguiculata (L.) Walp. subsp. unguiculata
Previously recorded by Exell (1963: 99, 1973: 361) and Estrella et al. (2010: 42).
We have not found any herbarium material of V. unguiculata subsp. unguiculata from Equatorial Guinea
in BM, BRLU, K, LISU, MA and P. However the presence of this taxon in Annobón seems plausible since it is
cultivated and naturalized in all tropical and subtropical Africa.
Vigna unguiculata subsp. denkindtiana (Harms) Verdc.
EQUATORIAL GUINEA. Annobón: Palé, arredores desta povoacao, Carvalho 3161 (K, MA 713433); San
Antonio de Palé, subida al pico do Fogo desde la cantera, Fero et al. 212 (MA 828506); E path towards Crater
Lake, Melville 162 (K, MA 191346); alrededores del hotel de Annobón, Velayos et al. 11491 (MA 828497).
Previously recorded by Estrella et al. (2010: 42).
GENTIANACEAE
Canscora alata (Roth) Wall.
EQUATORIAL GUINEA. Annobón: NW of island, Wrigley & Melville 137 (MA 251695).
Previously recorded by Exell (1973: 380, sub C. decussata (Roxb.) Roem. & Schult.).
Exacum oldenlandioides (S.Moore) Klack.
EQUATORIAL GUINEA. Annobón: NW of island, Wrigley & Melville 9 (MA 199526).
Previously recorded by Exell (1973: 380, sub E. quinquenervium Griseb.).
According to Nemomissa (2002: 4), E. quinquenervium is restricted to Madagascar. Thus records from West
Tropical Africa of E. quinquenervium should be considered as mistakes confusing it with E. oldenlandioides. We
agree with Nemomissa (2002: 4) considering the Annobón material as E. oldenlandioides because they have 3-
veined leaves, corolla tube 4 mm long with lobes 3 mm long and anthers ca. 0.7 mm long.
LAMIACEAE [LABIATAE in Fl. Guinea]
Hoslundia opposita Vahl
EQUATORIAL GUINEA. Annobón: N da I'lha, Newton s.n. (LISU 165656).
Previously recorded by Sobrinho (1953: 185), Exell (1956: 39, 1973: 387) and Morales (2011: 203).
Leonotis nepetifolia (L.) R.Br.
EQUATORIAL GUINEA. Annobón: pr. Anganchi, Aedo et al. 18057 (MA 831274); Palé, alrededores del
campo de fútbol, Carvalho 3107 (MA 514501); Ambo, by our houses, Wrigley & Melville 141 (MA 255187).
Previously recorded by Exell (1963: 108, 1973: 387) and Morales (1993: 288, 2011: 206).
Cultivated and naturalized.
Ocimum basilicum L.
EQUATORIAL GUINEA. Annobón: San Antonio de Palé (playa de arenas blancas), Fero et al. 242 (MA
800864); Ambo, in village, Wrigley & Melville 40 (MA 185294).
Previously recorded by Exell (1963: 108, 1973: 387) and Morales (1993: 288, 2011: 209).
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Ocimum gratissimum L.
EQUATORIAL GUINEA. Annobón: Ambo, by our houses, Wrigley & Melville 142 (MA 185292); between
Ambo and Santa Cruz, Wrigley & Melville 241 (MA 185291).
Previously recorded by Mildbraed (1922: 163), Exell (1944: 267, sub O. viride Willd., 1973: 387) and Morales
(1993: 288–289, 2011: 210).
Plectranthus monostachyus (P.Beauv.) B.J.Pollard subsp. monostachyus
EQUATORIAL GUINEA. Annobón: pr. Anganchi, Aedo et al. 18064 (MA 831281); borde del lago A Pot,
Velayos et al. 11563 (MA 831228); San Pedro, Velayos et al. 11678 (MA 843693).
Previously recorded by Mildbraed (1922: 163, sub Solenostemon ocymoides Schum. & Thonn.), Exell (1944: 267,
sub Solenostemon monostachyus (P.Beauv.) Briq., 1973: 388, sub S. monostachyus subsp. monostachyus) and
Morales (2011: 216).
LORANTHACEAE
Viscum grandicaule Polh. & Wiens
EQUATORIAL GUINEA. Annobón: Palé–Alturas de Mol, márgenes del río A Bobo, San Juan, Carvalho 3145
(MA 525871, 533861); near pico do Fogo, Wrigley & Melville 86 (MA 189044).
Previously recorded by Exell (1963: 111, sub V. engleri Tiegh., 1973: 365, sub V. engleri), Fernández-Casas (1992:
49, sub V. engleri) and Polhill & Wiens (1998: 305).
According to Polhill & Wiens (1998: 304) this noticeably endemic species from Annobón, is quite similar to V.
engleri, with wider internodes, tuberculate berries, and monoecious. V. engleri is a species restricted to Tanzania
Mountains.
IUCN category: EN A2ac; B2ab (here proposed).
MALVACEAE
Adansonia digitata L. [BOMBACACEAE in Fl. Guinea]
EQUATORIAL GUINEA. Annobón: río Ajob (Jobo), Carvalho 3133 (MA 511996); cerca del hotel de
Annobón, Velayos et al. 11629 (MA 828572).
Previously recorded by Mildbraed (1922: 163), Exell (1973: 350) and Fernández-Casas (1992: 61).
Scarce on the island; present in some localities where, surely has not been cultivated.
Ceiba pentandra (L.) Gaertn. [BOMBACACEAE in Fl. Guinea]
EQUATORIAL GUINEA. Annobón: Palé, alrededores del cementerio, Carvalho 3104 (MA 512290); Palé,
alrededores de la población, Carvalho 3160 (MA 512305); borde del lago A Pot, Fero et al. 244 (MA 828163);
subida al pico Lago desde el lago A Pot, Velayos et al. 11579 (MA 828145); between cap San Juan and San
Pedro, Wrigley 261 (MA 217272).
Previously recorded by Mildbraed (1922: 163), Exell (1973: 350), Cufodontis (1959a: 576) and
Fernández-Casas (1992: 69).
According to Beentje (1989: 9) it “must be considered as native”.
Corchorus aestuans L. [TILIACEAE in Fl. Guinea]
EQUATORIAL GUINEA. Annobón: Palé, Carvalho 3060 (MA 512009); near Capelle St. Juan, Wrigley &
Melville 256 (MA 337311).
Previously recorded by Mildbraed (1922: 162, sub C. acutangulus Lam.), Exell (1944: 123, 1973: 349), Cufodontis
(1958b: 514) and Fernández-Casas (1992: 67).
Gossypium barbadense L.
EQUATORIAL GUINEA. Annobón: playa de San Antonio de Palé, Fero et al. 241 (MA 800865); Ambo,
Wrigley 12 (MA 219115).
Previously recorded by Exell (1963: 97, 1973: 351).
Naturalized.
Hibiscus physaloides Guill. & Perr.
EQUATORIAL GUINEA. Annobón: San Pedro, Newton s.n. (LISU 165648); [no locality], Newton s.n. (LISU
165649).
Previously recorded by Sobrinho (1953: 180) and Exell (1956: 12, 1973: 351).
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CHECKLIST OF THE VASCULAR PLANTS OF ANNOBÓN
Hibiscus rosa-sinensis L.
EQUATORIAL GUINEA. Annobón: borde de camino cerca del lago A Pot, Velayos et al. 11542 (MA
828458); subida al pico Quioveo, Velayos et al. 11655 (MA 843671).
Our specimen differs from typical H. rosa-sinensis in having leaves with stellated hairs and peduncles
three times the calyx length. However the staminal column, longly exerted, is typical of this species.
New record for Annobón. It has been collected in secondary forests and is most likely naturalized.
Sida alba L.
EQUATORIAL GUINEA. Annobón: near Cappelle St. Juan, Melville 259 (MA 194545).
Previously recorded by Exell (1944: 115, 1973: 351).
Sida cordifolia L.
EQUATORIAL GUINEA. Annobón: Pale, arrededores desta povoacáo, Carvalho 3055 (MA 716231); NW of
island, Melville 123 (MA 194542); [no locality], Newton s.n. (LISU 165647).
Previously recorded by Mildbraed (1922: 163), Exell (1944: 115, 1956: 12, 1973: 351) and Sobrinho
(1953: 180).
Sida rhombifolia L.
EQUATORIAL GUINEA. Annobón: near Cappelle St. Juan, Melville 258 (MA 194524); Vorland im Norden,
Mildbraed 6763 (HBG); [no locality], Newton s.n. (LISU 165646); alrededores del hotel de Annobón, Velayos
et al. 11509 (MA 828517).
Previously recorded by Exell (1944: 114, sub S. acuta Burm.f., 1963: 97, 1973: 351, sub S. acuta), Sobrinho (1953:
179, sub S. acuta) and Cufodontis (1959b: 542, sub S. acuta).
Annobón specimens have been identified as S. rhombifolia because its 1-nerved stipules and its leaves with stellate
hairs (cf. Verdcourt & Mwachala (2009)). Nevertheless, S. acuta could be found at Annobón since it is a weed,
present in Bioko and São Tomé.
According to Verdcourt & Mwachala (2009: 158), in East Africa, S. rhombifolia is a very variable species with six
varieties. Specimens from Annobón have mericarps with two distinct awns and leaves finelly stellate-puberulous
above, as Verdcourt & Mwachala (2009: 158) indicated for var. riparia Burtt Davy.
Sterculia tragacantha Lindl. [STERCULIACEAE in Fl. Guinea]
EQUATORIAL GUINEA. Annobón: Palé, margen derecha del lago A Pot, Carvalho 3163 (MA 558459);
borde del lago A Pot, Fero et al. 240 (MA 800866).
Previously recorded by Fernández-Casas & Regueiro y González-Barros (1996: 272).
Theobroma cacao L. [STERCULIACEAE in Fl. Guinea]
Previously recorded by Exell (1973: 350).
Cultivated and naturalized.
Triumfetta rhomboidea Jacq. [TILIACEAE in Fl. Guinea]
EQUATORIAL GUINEA. Annobón: Palé, alrededores del faro, Carvalho 3066 (MA 512008); alrededores del
hotel de Annobón, Velayos et al. 11482 (MA 828488); subida desde la cantera hacia el lago A Pot, Velayos et
al. 11535 (MA 828465); Ambo, near our houses, Wrigley & Melville 134 (MA 337400).
Previously recorded by Mildbraed (1922: 162), Exell (1944: 122, 1973: 348) and Fernández-Casas (1992:
68).
The specimens from Annobón have fruits with spines, hairy on the basal half. Otherwise, they match with
T. rhomboidea.
Urena lobata L.
EQUATORIAL GUINEA. Annobón: alrededor de Palé, Carvalho 3165 (MA 512304); [no locality], Newton
s.n. (LISU 165645); borde de camino cerca del lago A Pot, Velayos et al. 11543 (MA 831208); Ambo, 200 yds,
SW of church and mission, Wrigley 101 (MA 267725).
Previously recorded by Sobrinho (1953: 180), Exell (1956: 12, 1973: 351) and Fernández-Casas (1992: 69).
According to Verdcourt & Mwachala (2009: 158) in East Africa there are two varieties of this species: var. lobata
and var. sinuata (L.) Hochr. The specimens from Annobón correspond to var. lobata since their deeply palmately
lobed leaves (rarely unlobed), with lobes usually narrowing from base to apex; sometimes oblanceolate, wider near
apex, but sinuses acutes and narrow.
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Wissadula rostrata (Schumach.) Hook.f.
Previously recorded by Sobrinho (1953: 180, sub W. amplissima (L.) R.E.Fr. var. rostrata (Schumach.) R.E.Fr.)
and Exell (1973: 351).
According to Krapovickas (1996: 91), W. amplissima is an American species and the only species found in Africa
is W. rostrata. Its presence is quite plausible.
MELASTOMATACEAE
Calvoa crassinoda Hook.f.
EQUATORIAL GUINEA. Annobón: Gipfel des Quioveo, Mildbraed 6528 (HBG 509096, 509097).
Previously recorded by Mildbraed (1922: 163, sub C. uropetala Mildbr., 1937: 702, sub C. uropetala), Exell
(1944: 181, sub C. uropetala, 1973: 347, sub C. uropetala), Guinea (1946: 341, sub C. uropetala, 1951: 182, sub
C. uropetala, 1968: 134, sub C. uropetala), Brenan (1979: 464, sub C. uropetala), Jacques-Félix (1981: 130),
Morales (1994: 15, sub C. uropetala) and Figueiredo (2001: 191).
According to Jacques-Félix (1981: 130), C. uropetala is a synonym of C. crassinoda. This author studied the type,
kept at HBG. Figuereido (2001: 191) agree with this synonimization.
Endemic to Annobón and São Tomé.
IUCN category: VU D2 (here proposed).
Calvoa grandifolia Cogn.
EQUATORIAL GUINEA. Annobón: above Crater Lake on W side, Wrigley & Melville 164 (MA 268465).
Previously recorded by Figueiredo (2001: 190).
According to Jacques-Félix (1981: 130), although differs from the species-type because of its clearly
pedicellated capsules and verrucoses branches, the specimen Melville 164 should be named C. crassinoda.
Figueiredo (2001: 190) adscribed the same collection to C. grandiflora. We have studied the supporting
material at MA and follow Figueiredo’s opinion since the specimen presents entire leaves with pedicels 3–4
mm long. These two characters fit in the variation range of C. grandiflora.
Endemic to São Tomé, Príncipe and Annobón.
IUCN category: VU D2 (here proposed).
Tristemma littorale Benth. subsp. littorale
EQUATORIAL GUINEA. Annobón: base del pico do Fogo, Fero et al. 226 (MA 800960); subida al pico Lago
desde el lago A Pot, Velayos et al. 11624 (MA 828577); pico Surcado, Wrigley 65 (MA 270518).
Previously recorded by Jacques-Félix (1976: 187, sub subsp. biafranum Jacq.-Fél.) and Parmentier & Geerinck
(2003: 341).
Tristemma oreothamnos Mildbr.
EQUATORIAL GUINEA. Annobón: Gipfel des Quioveo, Mildbraed 6677 (HBG 509105).
Previously recorded by Mildbraed (1922: 163, 1937: 701), Exell (1944: 178, 1963: 100, 1973: 348),
Guinea (1946: 340, 1951: 178, 1968: 134), Jacques-Félix (1976: 177) and Morales (1994: 18).
According to Jacques-Félix (1976: 177), only two collections of this species are known. New specimens
are required to be sure of its taxonomic status. However, Morales (1994: 18), after studying the type at HBG
concluded that T. oreothamnos is a solid taxon.
Endemic to Annobón.
IUCN category: CR A2ac; B2ab (here proposed).
Warneckea fosteri (Hutch. & Dalziel) Jacq.-Fél.
EQUATORIAL GUINEA. Annobón: entre Aual (Santa Cruz) y Palé, 2,5 km de Aual, Carvalho 3110 (MA
558407); Palé–Alturas de Mol, márgenes del río A Bobo (San Juan), Carvalho 3144 (MA 558408); subida al
pico Lago desde el lago A Pot, Velayos et al. 11586 (MA 828138), 11591 (MA 828133); ridge W of Crater
Lake, Wrigley 201 (MA 268763).
Previously recorded by Morales (1995a: 18, sub Memecylon memecyloides (Benth.) Exell) and Parmentier &
Geerinck (2003: 339, sub Lijndenia jasminioides (Gilg) Borhidi). The latest authors recorded this species on the
basis of Carvalho 3110. This specimen has two axilar inflorescences and which do not have any terminal
inflorescence. Thus, it seems more suitable to identify this specimen as Warneckea fosteri, a species very frequent
in Annobón Island.
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CHECKLIST OF THE VASCULAR PLANTS OF ANNOBÓN
MELIACEAE
Turraea glomeruliflora Harms
EQUATORIAL GUINEA. Annobón: márgenes del lago A Pot, Carvalho 3070 (MA 525862); ridge W of
Crater Lake, Harms 52 (MA 302610); alrededores del hotel de Annobón, Velayos et al. 11510 (MA 828518);
borde de camino cerca del lago A Pot, Velayos et al. 11544 (MA 831209); roquedos al E del pico do Fogo,
Velayos et al. 11663 (MA 843679), 11664 (MA 843680).
Previously recorded by Mildbraed (1922: 162, 1937: 700), Exell (1944: 136, 1963: 97, 1973: 367), Guinea
(1946: 303, 1968: 134) and Fernández-Casas (1992: 62).
Endemic to Annobón.
IUCN category: EN A2ac; B2ab (here proposed).
MORACEAE
Artocarpus altilis (Park.) Fosberg
Previously recorded by Exell (1963: 113, sub A. communis J.R.Forst. & G.Forst., 1973: 361).
Naturalized. The presence of this species in Annobón seems plausible since it is present in nearest areas.
Artocarpus heterophyllus Lam.
EQUATORIAL GUINEA. Annobón: borde del lago A Pot, Velayos et al. 11547 (MA 831212).
Previously recorded by Exell (1963: 113, 1973: 361).
Naturalized.
Ficus chlamydocarpa Mildbr. & Burret subsp. chlamydocarpa
EQUATORIAL GUINEA. Annobón: Palé, alrededores del cementerio, Carvalho 3102 (MA 512291); cerca del
lago A Pot, Velayos et al. 11541 (MA 828459); Ambo, Wrigley 1 (MA 189001); base of pico do Fogo, Wrigley
88 (MA 189002).
Previoulsy recorded by Mildbraed (1922: 161, sub F. eriobotryoides var. latifolia Hutch.), Exell (1944: 307, sub F.
clarencensis Mildbr. & Hutch., 1973: 362), Keay (1958c: 608, sub F. clamydocarpa), Berg (1988: 81, 1996: 95)
and Fernández-Casas (1992: 46, sub F. clarencensis).
Records of F. saussureana DC. from Annobón should be considered F. chlamydocarpa (Exell 1944: 306–307).
Berg (1988: 81) cited from Annobón F. chlamydocarpa subsp. latifolia (Hutch.) C.C.Berg, saying that the plants
are ± hairy, at least on the stipules and the basal bracts ca. 0.5 cm long. Later, the same author (1996: 95)
considered that specimens from Annobón belong to subsp. chlamydocarpa.
Ficus mucuso Ficalho
EQUATORIAL GUINEA. Annobón: [no locality], Newton s.n. (LISU 165613).
Previously recorded by Exell (1956: 45, sub F. sidifolia Welw. ex Hiern, 1973: 362, sub F. sidifolia) and Sobrinho
(1953: 187, sub F. sidifolia).
Ficus thonningii Blume
EQUATORIAL GUINEA. Annobón: entre Palé y el aeropuerto, Carvalho 3079 (MA 511930); Ambo, Wrigley
13 (MA 188997).
Previously recorded by Mildbraed (1922: 161, sub F. annobonensis Mildbr. & Hutch. and F. thonningii), Exell
(1944: 306, sub F. annobonensis, 1973: 362, sub F. annonobonensis), Guinea (1946: 272, sub F. annobonensis,
1968: 134, sub F. annobonnensis), Fernández-Casas (1992: 46, sub F. annobonensis) and Berg (1996: 103).
Trilepisium madagascariense DC.
Previously recorded by Mildbraed (1922: 161, sub Bosqueia welwitschii Warb.), Exell (1944: 305, sub Bosqueia
angolensis Ficalho, 1973: 362, sub B. angolensis), Keay (1958c: 612, sub B. angolensis) and Berg (1977: 303).
According to Berg (1977: 299) T. magasdascariense is a very variable species and Bosqueia angolensis
and B. welwitschii should be considered as synonyms of this species.
Its presence in Annobón is quite plausible since it is present in nearest areas.
MYRTACEAE
Psidium guajava L.
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EQUATORIAL GUINEA. Annobón: camino de Palé a Santa Cruz (Awal), Fero et al. 253 (MA 800854); entre
el hotel de Annobón y Palé, Velayos et al. 11521 (MA 828478); subida desde la cantera hacia el lago A Pot,
Velayos et al. 11528 (MA 828472); Ambo, Wrigley 18 (MA 277214).
Previously recorded by Mildbraed (1922: 163), Exell (1944: 176, 1973: 347) and Cufodontis (1959b: 625).
Cultivated and widely naturalized.
Syzygium jambos (L.) Alston
EQUATORIAL GUINEA. Annobón: subida al pico Lago desde el lago A Pot, Velayos et al. 11610 (MA
831082).
Previously recorded by Mildbraed (1922: 163, sub Jambosa vulgaris DC.), Exell (1944: 177, sub Eugenia jambos
L., 1973: 347) and Cufodontis (1959b: 626, sub E. jambos).
Cultivated and widely naturalized.
NYCTAGINACEAE
Boerhavia coccinea Mill.
EQUATORIAL GUINEA. Annobón: ensenada de Pala Batelu, Aedo et al. 18084 (MA 831302); San Antonio,
Melville 252 (MA 192447); afueras de Palé, subida hacia la cantera, Velayos et al. 11524 (MA 828475).
Previously recorded by Exell (1963: 108, 1973: 343).
Boerhavia diffusa L.
EQUATORIAL GUINEA. Annobón: towards pico do Fogo, S of Ambo, Melville 106 (MA 192448);
alrededores del hotel de Annobón, Velayos et al. 11480 (MA 828486); San Pedro, Velayos et al. 11677 (MA
843692).
Previously recorded by Mildbraed (1922: 161) and Exell (1944: 269, 1963: 109, 1973: 343).
According to Codd (1966: 115) B. diffusa should be considered to be conspecific with B. coccinea Mill.
Nevertheless, Whitehouse (1996: 2) recognized B. diffusa for its large terminal panicle, with glabrous branches
and septate hairs on leaves margins and veins.
Mirabilis jalapa L.
Previously recorded by Exell (1944: 268, 1973: 343) and Cufodontis (1953: 75).
Naturalized.
The presence of this species in Annobón seems plausible since it is present in nearest areas.
OCHNACEAE
Ochna membranacea Oliv.
EQUATORIAL GUINEA. Annobón: Palé–San Pedro, base do monte Quepuchin, Carvalho 3092 (MA
837017); borde del lago A Pot, Velayos et al. 11553 (MA 831218); subida al pico Lago desde el lago A Pot,
Velayos et al. 11600 (MA 831092).
Previously recorded by Mildbraed (1922: 163, sub O. cf. gilgiana Engl.) and Exell (1944: 133, sub O. cf. gilgiana,
1963: 97, 1973: 346).
OLACACEAE
Heisteria parvifolia Sm.
EQUATORIAL GUINEA. Annobón: valle de Anganchi, Aedo et al. 18070 (MA 831288); Palé, lago A Pot,
margem direita do lago, Carvalho 3120 (MA 837010); borde del lago A Pot, Velayos et al. 11562 (MA
831227); subida al pico Lago desde el lago A Pot, Velayos et al. 11608 (MA 831084), 11611 (MA 831081).
Previously recorded by Mildbraed (1922: 161) and Exell (1944: 138, 1973: 364).
Olax gambecola Baill.
EQUATORIAL GUINEA. Annobón: Santa Cruz, Newton s.n. (LISU 165616).
Previously recorded by Sobrinho (1953: 181, sub O. viridis Oliv.) and Exell (1956: 14, 1973: 364).
Strombosia sp.
EQUATORIAL GUINEA. Annobón: Santa Mina, Mildbraed 6754 (HBG).
Previously recorded by Mildbraed (1922: 161) and Exell (1944: 138, 1973: 364).
It is not possible to identify, for sure the species of the sterile specimen by Mildbraed.
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CHECKLIST OF THE VASCULAR PLANTS OF ANNOBÓN
Ximenia americana L.
EQUATORIAL GUINEA. Annobón: Vorland des Nordens, Mildbraed 6626 (HBG).
Previously recorded by Mildbraed (1922: 161) and Exell (1944: 138, 1973: 364).
OLEACEAE
Olea capensis subps. welwitschii (Knobl.) Friis & P.S.Green
EQUATORIAL GUINEA. Annobón: ridge W of Crater Lake, Wrigley & Melville 57 (MA 279586).
Previously recorded by Mildbraed (1922: 163, sub O. welwitschii (Knobl.) Gilg & G.Schellenb.), and by Exell
(1944: 237, sub Steganthus welwitschii (Knobl.) Knobl., 1973: 371, sub O. welwitschii).
Friis & Green (1986: 36) recognized two subspecies for the complex O. capensis: subsp. hochstetterii (Baker) Friis
& P.S.Green and subsp. welwitschii. According to these authors, the subspecies may be easily distinguished by the
leaf characters.
The specimen from Annobón corresponds to subsp. welwitschii, with leaves narrowly elliptic to elliptic-lanceolate,
acutely acuminate, coriaceous and nearly glabrous on both surfaces except for well-spaced adpresed scales.
OXALIDACEAE
Oxalis corniculata L.
EQUATORIAL GUINEA. Annobón: S of Crater Lake, Melville 146 (MA 191357); alrededores del hotel de
Annobón, Velayos et al. 11498 (MA 828504); subida a Santa Mina desde San Pedro, Velayos et al. 11681 (MA
843696).
Previously recorded by Mildbraed (1922: 162), Exell (1944: 124, 1973: 342) and Cufodontis (1956: 352).
According to Sánchez Pedraja (2010: 6), this species is extremely variable in size, appearance, indumentum and
leaves and stems color. A lot of doubtful names with taxonomic value have been proposed. The specimen from
Annobón has ascending stems and leaflets about 15 mm long, which indicates that it could belong to var.
corniculata (Kabuye 1971: 3).
PASSIFLORACEAE
Adenia rumicifolia Engl. & Harms
EQUATORIAL GUINEA. Annobón: borde del lago A Pot, Velayos et al. 11559 (MA 831224); subida al pico
Quioveo, Velayos et al. 11642 (MA 843659).
Previously recorded by Mildbraed (1922: 163, sub A. lobata (Jacq.) Engl.), Exell (1944: 183, sub A. lobata, 1973:
344, sub A. lobata), Keay (1954b: 203, sub A. lobata) and De Wilde (1971: 158).
De Wilde (1971: 155) named the specimens of Annobón as var. miegei (Aké Assi) W.J.de Wilde based on Burton
s.n. (K). We are not able to assign our collections from Annobón to any variety, because they have leaves bases
deeply cordate (characteristic of the var. miegei) and fruit short-pyriform (3.5 cm) (characteristic of the var.
rumicifolia).
POLYGONACEAE
Polygonum salicifolium Willd.
EQUATORIAL GUINEA. Annobón: Palé–lago A Pot, nas margens do lago, Carvalho 3074 (MA 716275);
borde del lago A Pot, Velayos et al. 11560 (MA 831225); N shore of Crater Lake, Wrigley & Melville 78 (MA
191314).
Previously recorded by Mildbraed (1922: 161, sub P. serrulatum Lag.), Exell (1944: 274, 1973: 341) and
Fernández-Casas (1992: 50).
PORTULACACEAE
Portulaca oleracea L.
EQUATORIAL GUINEA. Annobón: entre el hotel de Annobón y Palé, Velayos et al. 11519 (MA 828527);
Ambo, by our houses, Wrigley & Melville 168 (MA 192421).
Previously recorded by Exell (1963: 96).
Annobón specimens have seeds of ca. 0.6–0.8 mm diam. with tuberculate and granular-papillose testa. According
Phillips (2002: 12) they should be identified as subsp. granulato-stellulata (Poelln.) Danin & H.G.Baker. However,
Matthews et al. (1993: 176) pointed out that “P. oleracea is a polymorphic species and is not divisible into
subspecies based on seed surface as the primary morphological trait”.
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Talinum triangulare (Jacq.) Willd.
EQUATORIAL GUINEA. Annobón: Palé–Alturas de Mol, márgenes del río A Bobo (San Juan), Carvalho
3142 (MA 512298); alrededores del hotel de Annobón, Velayos et al. 11507 (MA 828515); NW of San Pedro,
Wrigley & Melville 194 (MA 192420).
Previously recorded by Exell (1963: 97) and Fernández-Casas (1992: 52).
Phillips (2002: 30) pointed out that T. triangulare is sometimes confused with T. portulacifolium (Forssk.) Asch.
ex Schweinf. The first is easily distinguished by its corymboid inflorescence with triangular branches, 3-nerved
sepals, and seeds with broad tubercles.
Naturalized.
RHIZOPHORACEAE
Cassipourea annobonensis Mildbr.
EQUATORIAL GUINEA. Annobón: Palé, lago A Pot, margens esquerda do lago, Carvalho 3117 (MA
837009), 3147 (MA 837014); borde del lago A Pot, Fero et al. 228 (MA 800958); pico do Fogo on SW side,
Melville 190 (MA 270846).
Previously recorded by Mildbraed (1922: 163, 1937: 700), Alston (1925: 274), Exell (1944: 174, 1963: 100, 1973:
348) and Guinea (1946: 338).
Since Alston (1925) monograph, no comprehensive revision of the genus has been published. Breteler (2007)
pointed out that many species of this monograph have been reduced to synonymy. However C. annobonensis has
not been carefully compared with closed species of West Tropical Africa yet. It seems to be close to C. mannii
Engl., but with less flowers per glomerule, and shorther pedicels.
Endemic to Annobón.
IUCN category: EN A2ac; B2ab (here proposed).
ROSACEAE
Rubus pinnatus Willd.
EQUATORIAL GUINEA. Annobón: pico Sulcado, Wrigley & Melville 265 (MA 189838).
Previously recorded by Mildbraed (1922: 161) and Exell (1944: 172, 1973: 355).
The specimen studied from Annobón has leaflets glabrescents beneath, as is attributed to var. afrotropicus (Engl.)
Gustafsson (Letouzey 1978: 218).
RUBIACEAE
Bertiera annobonensis G.Taylor
EQUATORIAL GUINEA. Annobón: near highest point of crater, Wrigley & Melville 93 (MA 311408).
Previously recorded by Mildbraed (1922: 163–164, sub B. laxa Benth., 1937: 704), Exell (1944: 208, 1963: 102,
1973: 372), Guinea (1968: 134), Robbrecht et al. (1993: 134) and Davis & Figueiredo (2007: 162).
Taylor (Mildbraed 1937: 704) pointed out that B. annobonensis is close to B. pedicellata (Hiern) Wernham, an
endemic species of São Tomé. B. annobonensis seems to differ in its more compact inflorescence, with shorter
pedicels, calix and corolla tube almost glabrous. Lebrun & Stork [http://www.ville–ge.ch/musinfo/bd/cjb/africa/
details.php?langue=an&id=179985, accessed 13 Oct 2011] and Davis & Figueiredo (2007: 162) accepted this taxa,
whereas (Robbrecht et al. 1993: 134) considered it as a doubtful species. The species apparently has not been
further studied and properly compared with its relatives.
IUCN category: CR A2ac; B2ab (modified from the proposal by Davis & Figuiredo 2007:162).
Borreria verticillata (L.) Mey
EQUATORIAL GUINEA. Annobón: entre el hotel de Annobón y Palé, Velayos et al. 11520 (MA 828528).
New record for Annobón.
Craterispermum montanum Hiern
EQUATORIAL GUINEA. Annobón: Quioveo, Mildbraed 6535 (HBG); subida al pico Quioveo, Velayos et al.
11644 (MA 843661).
Previously recorded by Mildbraed (1922: 164), Exell (1944: 211, 1973: 373), Guinea (1968: 134) and Davis &
Figueiredo (2007: 164).
According to Exell (1944: 211) C. montanum is a species endemic to Annobón, São Tomé and Príncipe, close to C.
cerinanthum Hiern which is widespread on mainland. The two species are only separable on slight characters: the
first has the calyx deeper and open at the mouth, and the leaves abruptly cuneate at the base. Thus, it is likely that a
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CHECKLIST OF THE VASCULAR PLANTS OF ANNOBÓN
taxonomic revision of this group could reduce C. montanum to synonymy of C. cerinanthum. Our collection and
those of Midbraed belong to short-styled form described by Exell (1944: 211).
IUCN category: VU D2 (according to IUCN 2011. IUCN Red List of Threatened Species. Version 2011.2. http://
www.iucnredlist.org).
Oldenlandia corymbosa L.
EQUATORIAL GUINEA. Annobón: punta Sambobo, Aedo et al. 18053 (MA 831270); San Antonio de Palé,
subida al pico do Fogo desde la cantera, Fero et al. 216 (MA 800970); NW of island, Wrigley & Melville 121
(MA 185310).
Previously recorded by Mildbraed (1922: 163), Exell (1944: 218, 1973: 374) and Davis & Figueiredo
(2007: 168).
The specimen Fero et al. 116 is a robust perennial plant with lignified branches. Otherwise, it matches
with O. corymbosa. The remaining specimens studied from Annobón are small and annual herbaceous plants.
Oldenlandia herbacea (L.) Roxb.
EQUATORIAL GUINEA. Annobón: NW of island, Wrigley & Melville 11 (MA 185311).
Previously recorded by Exell (1963: 103, 1973: 374) and Davis & Figueiredo (2007: 168).
Oxyanthus speciosus DC. subsp. speciosus
EQUATORIAL GUINEA. Annobón: floresta de Santa Cruz, Newton s.n. (LISU).
Previously recorded by Sobrinho (1953: 184), Exell (1956: 24) and Davis & Figueiredo (2007: 169, sub O.
unilocularis Hiern).
Davis & Figueiredo (2007: 169) recorded in Annobón O. unilocularis based on Newton s.n. but without seeing it.
However, this specimen has the leaves 15–18 cm long and symmetric base which suggests that should be identified
as O. speciosus. According to Sonké & Robbrecht (1996) and Sonké (1999), O. speciosus is a variable species.
Although Newton specimen does not have fruit, it shows glabrous leaves which suggest that it could be subsp.
speciosus.
Pauridiantha floribunda (K.Schum. & K.Krause) Bremek.
EQUATORIAL GUINEA. Annobón: subida al pico Quioveo, Velayos et al. 11654 (MA 843670).
Until now only the collections of Mildbraed were known (all of them have, probably, disappeared). Recorded by
Mildbraed (1922: 163, sub Urophyllum annobonense Mildbr., 1937: 703, sub Urophyllum floribundum var.
annobonense Mildbr.), Exell (1944: 203, sub U. floribundum K.Schum. & K.Krause, 1973: 375), Guinea (1946:
365, sub U. annobonense Mildbr.), Davis & Figueiredo (2007: 170) and Ntore (2008: 102).
Exell (1944: 203) considered U. floribundum var. annobonense as synonym of U. floribundum. This point of view
is also followed by Ntore (2008: 99).
Pavetta monticola Hiern
EQUATORIAL GUINEA. Annobón: Palé–Alturas de Mol, margens do rio A Bobo, Carvalho 3101 (MA
735600).
Previously recorded by Mildbraed (1922: 164, sub P. dermatophylla Mildbr., 1937: 705, sub P. dermatophylla),
Exell (1944: 207, 1973: 375), Guinea (1946: 362, sub P. dermatophylla, 1968: 134), Hepper & Keay (1963: 139),
Manning (1996: 148, sub P. annobonensis Bremek.) and Davis & Figueiredo (2007: 171).
Endemic to São Tomé and Annobón. IUCN category: VU D2 (here proposed).
Pouchetia confertiflora Mildbr.
EQUATORIAL GUINEA. Annobón: Palé–Mabana (San Antonio), Carvalho 3108 (MA 656648); Palé–lago A
Pot, margens esquerda, Carvalho 3152 (MA 716229).
Previously recorded by Mildbraed (1922: 163, 1937: 703), Exell (1944: 201, 1973: 375), Guinea (1946: 362, 1968:
134) and Davis & Figueiredo (2007: 172)
According to Davis & Figuereido (2007: 172) our collections should be consider P. confertiflora, an endemism of
Annobón. Nevertheless, in the original description of this taxon (Mildbraed 1937: 703) the calyx is described as
“glabri tubus”. The hairy calyx of our specimens suggests that our collections are may be closer to P. parviflora
Benth. Davis & Figuereido (2007: 172) pointed out that “the genus Pouchetia is currently under revision by
Robbrecht, who has suggested that specimens from São Tomé, Príncipe and Annobón might belong to another
taxon”.
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IUCN category: EN A2ac; B2ab (modified from the proposal by Davis & Figuiredo 2007:172).
Psychotria lucens Hiern
EQUATORIAL GUINEA. Annobón: camino de Palé a Santa Cruz (Awal), Fero et al. 246 (MA 800861);
subida al pico Lago desde el lago A Pot, Velayos et al. 11598 (MA 828570), 11609 (MA 831083).
Specimens from Annobón have leaves 18–21 cm long, otherwise they fit well with description by Alves et
al. (2005: 476).
New record for Annobón. Widespread in Nigeria, Cameroon, São Tomé, Príncipe and Bioko.
Psychotria peduncularis (Salisb.) Steyerm.
EQUATORIAL GUINEA. Annobón: subida al pico Lago desde el lago A Pot, Velayos et al. 11614 (MA
831077), 11621 (MA 831071), 11625 (MA 828576); pico Surcado, Wrigley & Melville 64 (MA 312969).
Previously recorded by Mildbraed (1922: 164, sub Uragoga membranifolia Mildbr., 1937: 705, sub Uragoga
peduncularis (Salisb.) K.Schum.), Exell (1944: 216, sub Cephaelis peduncularis Salisb., 1973: 373, sub C.
peduncularis), Guinea (1946: 365, sub U. membranifolia), Alves et al. (2005: 476) and Davis & Figueiredo (2007:
174).
Rutidea smithii Hiern subsp. smithii
EQUATORIAL GUINEA. Annobón: Palé–monte Santiago, na cumbre, Carvalho 3157 (MA 833754).
Previously recorded by Bridson (1978: 271) and Davis & Figueiredo (2007: 176).
The Annobón specimens have calyx and corolla sparsely to densely pubescent which indicates that it could
belong to subsp. smithii (Polhill 1988: 609).
Rytigynia umbellulata (Hiern) Robyns
EQUATORIAL GUINEA. Annobón: Palé–Alturas de Mol, margens do rio A Bobo, Carvalho 3099 (MA
837013), 3143 (MA 837012); alrededores del hotel de Annobón, Velayos et al. 11497 (MA 828503); subida al
pico Lago desde el lago A Pot, Velayos et al. 11585 (MA 828139).
Previously recorded by Wildeman (1922: 50, sub Vangueria concolor Hiern), Exell (1944: 210, sub R. concolor
(Hiern) Robyns, 1973: 377, sub R. concolor (Hiern) Robyns) and Davis & Figueiredo (2007: 177).
Sabicea ingrata K.Schum.
EQUATORIAL GUINEA. Annobón: subida al pico Quioveo, Velayos et al. 11651 (MA 843667); pico del
Centro, Wrigley & Melville 211 (MA 317077).
Previously recorded by Mildbraed (1922: 163, sub S. annobonensis Mildbr., 1937: 703, sub S. insularis (Wernh.)
G.Taylor), Exell (1944: 206, sub S. insularis, 1973: 377, sub S. insularis), Guinea (1946: 364, sub S. annobonensis,
1968: 134, sub S. insularis) and Davis & Figueiredo (2007: 177, sub S. ingrata var. insularis (Wernham) Joffroy).
The specimen studied has stipules 6 mm long and capitules 9–10 mm diam.; these characters correspond to var.
insularis (Joffroy 2002: 388).
Endemic to Annobón and São Tomé. IUCN category: VU D2 (here proposed).
Spermacoce exilis (L.O.Williams) C.Adams ex W.C.Burger & C.H.Taylor
EQUATORIAL GUINEA. Annobón: pico do Fogo, Wrigley & Melville 196 (MA 185484).
Previously recorded by Exell (1944: 219, sub Borreria ocymoides (Burm.f.) DC., 1973: 372, sub B. ocymoides) and
Davis & Figueiredo (2007: 178).
Naturalized.
Uncaria africana G.Don
Previously recorded by Exell (1963: 102, 1973: 378, sub U. africana var. africana), Hepper & Keay (1963: 162,
sub U. africana var. africana), Cufodontis (1965: 999) and Davis & Figueiredo (2007: 180).
RUTACEAE
Citrus aurantium L.
EQUATORIAL GUINEA. Annobón: subida al pico Lago desde el lago A Pot, Velayos et al. 11582 (MA
828142); Ambo, Wrigley 25 (MA 207452).
Previously recorded by Mildbraed (1922: 162) and Exell (1944: 131, 1973: 366).
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CHECKLIST OF THE VASCULAR PLANTS OF ANNOBÓN
Fagara annobonensis Mildbr.
EQUATORIAL GUINEA. Annobón: Q.–Aufstieg von Kratersee zum Quioveo, Mildbraed 6550 (HBG
510275, 510276).
Previously recorded by Mildbraed (1922: 162, 1937: 700), Exell (1944: 130, 1973: 366), Guinea (1946:
300, 1968: 134) and Brenan (1979: 464).
Endemic to Annobón. This species is only known from type collection by Mildbraed. More collections are
needed to ascertain the status of this endemism. IUCN category: CR A2ac; B2ab (here proposed).
SAPINDACEAE
Cardiospermum corindum L.
EQUATORIAL GUINEA. Annobón: Palé–Santa Cruz, márgenes del río Luba, Carvalho 3063 (MA 516989,
533851); alrededores del hotel de Annobón, Velayos et al. 11508 (MA 828516); lago A Pot, Velayos et al.
11569 (MA 828154); S of Ambo towards pico do Fogo, Wrigley et Melville 113 (MA 319071).
Previously recorded by Mildbraed (1922: 162), Exell (1944: 142, 1973: 367), Cufodontis (1958b: 490) and
Fernández-Casas (1992: 64).
Davies & Verdcourt (1998: 102) pointed out that the forms accepted by Radlkofer (1932: 397) cannot
deserve taxonomic recognition.
Sapindus saponaria L.
EQUATORIAL GUINEA. Annobón: Vorland in Norden, Gebüsch, Mildbraed 6710 (HBG).
Previously recorded by Mildbraed (1922: 162) and Exell (1944: 144, 1973: 367).
Mildbraed (1922: 162) collected and recorded this species indicating that his material was sterile. We have
examined the dupla at HBG which is sterile also. Otherwise it fits very well with this species due to its leaves,
with winged rachis.
Probably naturalized.
SAPOTACEAE
Mimusops cf. lacera Baker
EQUATORIAL GUINEA. Annobón: Weg nach Santa Cruz, Mildbraed 6595 (HBG); Nordkrater, Mildbraed
6611 (HBG).
Previously recorded by Mildbraed (1922: 163) and Exell (1944: 236, 1973: 370).
Mildbraed (1922: 163) recorded this species with some doubts because the specimens collected by him
were sterile (Mildbraed 6595 and 6611). The dupla at HBG are also sterile. No more information has been
obtained since then.
SCROPHULARIACEAE
Alectra sessiliflora (Vahl) Kuntze
EQUATORIAL GUINEA. Annobón: pico do Fogo, SW side, Wrigley & Melville 189 (MA 327307).
Previously recorded by Exell (1963: 107, sub A. sessiliflora var. monticola (Engl.) Melch., 1973: 383, sub A.
sessiliflora var. monticola).
Mielcarek (1996: 91) recognized 3 varieties in A. sessiliflora. Annobón specimens have erect-patent leaves but
shortly petiolated, which does not fit with any of the varieties. We agree with Ghazanfar et al. (2008: 112), who
pointed out that is extremely difficult to separate this varieties and recognized a single but a variable taxa.
Lindernia crustacea (L.) Müller
EQUATORIAL GUINEA. Annobón: punta Sambobo, Aedo et al. 18052 (MA 831269); Ambo, between the
Administrator's and our houses, Wrigley & Melville 170 (MA 185816).
Previously recorded by Fischer (1992: 223).
Lindernia diffusa (L.) Wettst.
EQUATORIAL GUINEA. Annobón: NW of island, Wrigley & Melville 10 (MA 185792).
Previously recorded by Exel (1963: 107) and Fischer (1992: 232).
Nuxia congesta R.Br. ex Fresen. [BUDDLEJACEAE in Fl. Guinea]
EQUATORIAL GUINEA. Annobón: Gipfel des pico do Fogo, Mildbraed 6561 (HBG).
Previously recorded by Mildbraed (1937: 702, sub Lachnopylis annobonensis Mildbr.), Exell (1944: 244, sub L.
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annobonensis, 1963: 104, sub var. congesta, 1973: 370, sub var. congesta), Leeuwenberg (1975: 20) and Brenan
(1979: 464, sub L. annobonensis).
Scoparia dulcis L.
EQUATORIAL GUINEA. Annobón: Palé, arrededores do aeroporto, Carvalho 3138 (MA 833153); Ambo,
Wrigley & Melville 37 (MA 332773).
Previously recorded by Mildbraed (1922: 163) and Exell (1944: 257, 1973: 383).
SOLANACEAE
Capsicum frutescens L.
EQUATORIAL GUINEA. Annobón: borde del lago A Pot, Fero et al. 230 (MA 800876); alrededores del hotel
de Annobón, Velayos et al. 11494 (MA 828500); between pico do Fogo and San Pedro, Wrigley & Melville 94
(MA 331061).
Previously recorded by Exell (1963: 107, sub C. annuum L., 1973: 381, sub C. annuum).
Cultivated and naturalized.
Physalis angulata L.
EQUATORIAL GUINEA. Annobón: Palé, alrededores del campo de fútbol, Carvalho 3106 (MA 511925,
533853); San Antonio de Palé, subida al pico do Fogo desde la cantera, Fero et al. 211 (MA 800974);
alrededores del hotel de Annobón, Velayos et al. 11487 (MA 828493).
Previously recorded by Exell (1963: 106, 1973: 382) and Hepper (1992: 31, sub Ph. micrantha Link).
The later author identified the specimen Carvalho 3106 as Ph. micrantha. The dupla at MA has leaves ca. 8 cm
long with sinuate-dentate margins which fits better with Ph. angulata.
Naturalized.
Solanum americanum Mill.
EQUATORIAL GUINEA. Annobón: Palé–lago A Pot, margens esquerda, Carvalho 3150 (MA 3150); [no
locality], Newton s.n. (LISU 165657); subida al pico Lago desde el lago A Pot, Velayos et al. 11623 (MA
828578); pico do Fogo, SW side, Wrigley & Melville 188 (MA 186054).
Previously recorded by Sobrinho (1953: 185, sub S. nigrum L.), Exell (1963: 106, sub S. nodiflorum Jacq., 1973:
382, sub S. nigrum).
Exell (1973: 382) and Hepper (1992: 36) pointed out that records of S. nigrum L. from Gulf of Guinea Islands are
probably S. americanum. Specimens from Annobón have short flowers and anthers as correspond to S.
americanum.
Solanum dasyphyllum Schumach. & Thonn.
Previously recorded by Exell (1963: 106, 1973: 382).
The presence of this species in Annobón seems plausible since it is present in nearest areas.
ULMACEAE
Celtis philippensis Blanco
EQUATORIAL GUINEA. Annobón: punta Sambobo, Aedo et al. 18055 (MA 831272); margem da lago Apata,
Newton s.n. (LISU 165614); entre Palé y San Pedro, en el cruce del río Hahú, Carvalho 3089 (MA 558419);
borde del lago A Pot, Velayos et al. 11550 (MA 831215); between Capelle San Juan and San Pedro, Wrigley &
Melville 68 (MA 188990).
Previously recorded by Mildbraed (1922: 161, sub C. prantlii Priemer), Exell (1944: 303, sub C. prantlii, 1956: 43,
sub C. prantlii, 1973: 361, sub C. prantlii), Guinea (1946: 271, sub C. insularis Rendle, 1968: 134, sub C. prantlii)
and Sobrinho (1953: 187, sub C. prantlii).
Specimens from Gulf of Guinea have been identified sometimes as C. prantlii (Lebrun & Stork 1992: 129).
However, this is a very variable species for which a synthetic treatment seems to be advisable, as pointed out
Letouzey (1968: 26) and Wilmot-Dear (1991: 7).
Chaetachme aristata Mey. ex Planch.
EQUATORIAL GUINEA. Annobón: ensenada de Pala Batelu, Aedo et al. 18082 (MA 831300); Palé–San
Pedro, Carvalho 3090 (MA 837016); Palé, lago A Pot, margem direita do lago, Carvalho 3124 (MA 656651);
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CHECKLIST OF THE VASCULAR PLANTS OF ANNOBÓN
de Palé a Santa Cruz (Awal), junto al arroyo Jada, Fero et al. 259 (MA 800850), Fero et al. 260 (MA 800849);
subida al pico Lago desde el lago A Pot, Velayos et al. 11594 (MA 828566).
Previously recorded by Mildbraed (1922: 161, sub Ch. microcarpa Rendle and Ch. serrata Engl.), Exell (1944:
302, 1973: 361) and Keay (1958d: 593).
Trema orientalis (L.) Blume
EQUATORIAL GUINEA. Annobón: Palé, alrededores de Dyo Dyo, camino de San Pedro, Carvalho 3114
(MA 512295); San Antonio de Palé, subida al pico do Fogo desde la cantera, Fero et al. 214 (MA 800972), 217
(MA 800969); entre el hotel de Annobón y Palé, Velayos et al. 11518 (MA 828526); between Ambo and Crater
Lake, Wrigley & Melville 60 (MA 309374).
Previously recorded by Mildbraed (1922: 161, sub T. guineensis (Schum.) Engl.), Exell (1944: 304, sub T.
guineensis, 1973: 361) and Fernández-Casas (1992: 45).
Letouzey (1968: 55) recognized three forms in this variable species, considering leaf indumentums and size of the
plants. Plants from Annobón match with “forme C” because of its dense indumentum on the abaxial side. St-
Laurent et al. (2000) considered T. orientalis a single, although variable, species.
URTICACEAE
Laportea aestuans (L.) Chew
EQUATORIAL GUINEA. Annobón: lago A Pot, margen derecha, Carvalho 3149 (MA 512297); alrededores
del hotel de Annobón, Velayos et al. 11492 (MA 828498); subida al pico Lago desde el lago A Pot, Velayos et
al. 11581 (MA 828143), 11622 (MA 828579).
Previously recorded by Exell (1944: 311, sub Fleurya aestuans (L.) Gaudich. ex Miq., 1973: 363) and Fernández-
Casas (1992: 47).
Procris crenata C.B.Rob.
EQUATORIAL GUINEA. Annobón: pico Surcado, Wrigley & Melville 69 (MA 339146).
Previously recorded by Mildbraed (1922: 161, sub P. laevigata Bl.), Exell (1944: 312, 1973: 363) and Keay
(1958e: 621).
Urera mannii (Wedd.) Benth. & Hook.f. ex Rendle
Previously recorded by Mildbraed (1922: 161, sub U. obovata Benth.) and Exell (1944: 313, 1973: 363).
Both records are supported by the specimen Mildbraed 6756. This specimen was supposed to be filed at B (now
destroyed). We have failed to find a duplicate at HBG. However, the presence of this species in Annobón is
quite plausible since it is present in nearest areas.
Urera trinervis (Hochst. ex Krauss) Friss & Immelman
EQUATORIAL GUINEA. Annobón: borde del lago A Pot, Fero et al. 231 (MA 800875); all over the island,
Wrigley & Melville 223 (MA 339158).
Previously recorded by Exell (1963: 114, sub U. cameroonensis Wedd., 1973: 363, sub U. cameroonensis).
VERBENACEAE
Clerodendrum silvanum Henriq.
Previously recorded by Exell (1944: 265, 1973: 386).
The presence of this species in Annobón is quite plausible since it is present in nearest areas.
VIOLACEAE
Rinorea angustifolia subsp. engleriana (De Wild. & T.Durand) Grey-Wilson
EQUATORIAL GUINEA. Annobón: base do pico de Santa Estephania, Newton s.n. (LISU 165651); Santa
Cruz, Newton s.n. (LISU 165652).
Previously recorded by Sobrinho (1953: 179, sub R. molleri Brandt) and Exell (1973: 340).
Annobón specimens have leaf-lamina long-acuminate, with 8–10 pairs of lateral veins and petioles pubescent 5
mm long. Grey-Wilson (1981: 111) considers this species highly variable and divides it into 6 subespecies.
Following this proposition, our material belongs to R. angustifolia subsp. engleriana (De Wild. & T.Durand) Grey-
Wilson.
Sobrinho (1953: 179) recorded São Tomé endemic R. molleri in Annobón based on Newton specimens. As
previously noted, we have identified Newton´s specimens as R. angustifolia subsp. engleriana. According to Grey-
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Wilson (1981: 113), R. molleri probably belongs to R. angustifolia subsp. engleriana but requires further
investigation.
E. CULTIVATED SPECIES
Anacardium occidentale L.
EQUATORIAL GUINEA. Annobón: [no locality], Mildbraed 6609 (HBG). Previously recorded by Mildbraed
(1922: 162), Exell (1944: 145, 1973: 367) and Cufodontis (1958a: 466).
Citrus sp. pl.
Several species have been cultivated in Annobón.
Coffea liberica Bull. ex Hiern
EQUATORIAL GUINEA. Annobón: ridge W of Crater Lake, Wrigley & Melville 50 (MA 313416). Previously
recorded by Exell (1963: 102, 1973: 373).
Datura candida (Pers.) Saff.
Previously recorded by Exell (1963: 107, 1973: 381). Cultivated near the destroyed church.
Ixora coccinea L.
EQUATORIAL GUINEA. Annobón: Ambo, near mission, Wrigley & Melville 218 (MA 316535).
Previously recorded by Exell (1963: 102, 1973: 374) and Davis & Figueiredo (2007: 166).
Jatropha multifida L.
EQUATORIAL GUINEA. Annobón: Ambo, near Post Office, Melville 156 (MA 251017).
Previously recorded by Exell (1963: 112, 1973: 353).
Manihot esculenta Crantz
EQUATORIAL GUINEA. Annobón: borde del lago A Pot, Fero et al. 235 (MA 800871).
Previously recorded by Exell (1944: 297, 1973: 354) and Cufodontis (1956: 438).
Maranta arundinacea L.
Previously recorded by Exell (1973: 390) and Cabezas (2005: 178).
Melia azedarach L.
EQUATORIAL GUINEA. Annobón: Mábana, Aedo et al. 18088 (MA 831306); San Antonio de Palé (playa de
arenas blancas), Fero et al. 243 (MA 800863).
Musa × paradisiaca L. [= M. acuminata Colla × M. balbisiana Colla]
Previously recorded by Exell (1944: 336, 1973: 389).
Nicotiana tabacum L.
EQUATORIAL GUINEA. Annobón: Ambo, Wrigley & Melville 59 (MA 185771). Previously recorded by
Exell (1963: 107, 1973: 382).
Plumeria rubra L.
Previously recorded by Exell (1963: 104, 1973: 371), as cultivated in Palé, in front of the church.
Polyscias guilfoylei L.H.Bailey
Previously recorded by Exell (1963: 102, 1973: 368), as cultivated near the church of San Juan.
Punica granatum L.
EQUATORIAL GUINEA. Annobón: Ambo, near the mission, Wrigley & Melville 219 (MA 210072).
Ricinus communis L.
Previously recorded by Exell (1963: 113, 1973: 35).
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CHECKLIST OF THE VASCULAR PLANTS OF ANNOBÓN
Saccharum officinarum L.
Recorded by Exell (1944: 379).
Sansevieria metallica Hort. ex Gérome & Labroy
According to Exell (1963: 116), is native of tropical Africa but introduced into other parts of the tropics. Cited
by Exell (1963: 116, 1973: 392), referring as supporting material Melville 309 [Palé, near the mission].
Solanum lycopersicum Lam.
Previously recorded by Exell (1963: 106, sub Lycopersicum esculentum var. cerasiforme (Dunal) Alef., 1973: 382,
sub L. esculentum var. cerasiforme).
Xanthosoma sagittifolium (L.) Schott
Previously recorded by Exell (1963: 116, 1973: 391).
F. DOUBTFUL OR ERRONEUS RECORDS
ACANTHACEAE
Avicennia germinans (L.) L. [AVICENNIACEAE in Fl. Guinea]
Recorded in Annobón (without a precise locality) by Exell (1973: 387), referring to Exell (1963: 108). In the
latter article, the plant was cited in SãoTomé, but not in Annobón. It is probably a mistake, as we have no
evidence of the presence of this taxon in Annobon. At the present there is no habitat suitable for this species.
CONVOLVULACEAE
Merremia umbellata (L.) Hallier f.
Wilkin (1994: 11) recorded this species from Annobón based on Carvalho 3089, and compiled by Fernández-Casas
& Morales (1995: 236). Surprisingly, the specimen kept at MA is a Celtis prantlii. The dupla at Kew is a M.
umbellata but in the printed label the number 3089 has been crossed out by hand and replaced by 3809. Carvalho
3809 at MA is really M. umbellata but from Bioko. All these facts suggest a labeling mistake and it should be
erased from Annobón Catalogue.
DILLENIACEAE
Tetracera alnifolia Willd.
Previously recorded by Exell (1963: 9, 1973: 344). Fernández-Casas (1992: 70) also cited this species on basis of
Carvalho 3118, but the specimen at MA is a misidentification with Cavacoa quintasii. The presence of this species
in Annobón is at least uncertain. Kubitzki (1970: 56) does not cite this species in Equatorial Guinea.
MELASTOMATACEAE
Memecylon memecyloides (Benth.) Exell
According to Parmentier (2003: 339, 341), the previous records of this species are misidentifications of Warneckea
fosteri (Wringley 201 and Carvalho 3144) or W. jasminioides (Carvalho 3110). As far as we know, M.
memecyloides is not present in Annobón.
PIPERACEAE
Peperomia fernandopoiana C.DC.
The record from Düll (1973: 115) is based on a cultivated plant in the Paris Botanical Garden apparently
from Annobón. There is not herbarium material to support this record. Previously recorded by Düll (1973: 115)
and Verdcourt (1996: 21).
V. Floristic Analysis
Due to their biological importance floristic inventories of islands are an urgent need (Campell & Hammond 1989).
The more remote islands are usually not easy to access and are difficult to explore so much of the published data is
unreliable. The lack of accuracy has been caused by two factors: first, an insufficient floristic knowledge, secondly
the possible inflation of the number of endemic species. Many of the analyses are made with outdated bibliographic
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data which assumes complete floristic inventories. When new collections are added the species numbers change
drastically. Endemic species are often only known only from type collections which require new data to evaluate
their taxonomic status. Annobón is a good example of both two factors. To analyze the data, we have used the
publications of Exell (1944, 1963, 1973) which are the only existing catalogue of Annobón's flora (Table 1).
TABLE 1. Number of Annobón vascular plants according to Exell’s catalogues and our own data.
The bare number of species found in Annobón (365) even taking into account the small size and low altitude of
the island, can be consider very low when compared with the flora of the nearest island, São Tomé, with 1104
flowering plants according to Figueiredo et al. (2011). Nonetheless our results reflect an increase of c. 243% since
the first Annobón’s catalogue (Exell, 1944). Thus, the comparison with other floras, based mostly on calculated
rates and figures by Exell (1944, 1973), has to be up-to-date too. For this comparison purposes, only native taxa are
included, and as Exell (1944: 27) we consider them as the unique significant taxa for the analysis of the
catalogue.The percentage of Pteridophytes in relation to Spermatophyta is characteristically high in oceanic
islands. With the new numbers, in the Flora of Annobón this percentage falls from the 22.8% of Exell (1944: 50) to
17.4%. This figure is very similar to that of São Tomé or Príncipe, of 17.9 and 17.3 % respectively (Exell 1944).
Also the degree of endemicity has changed the figures for the Flora of Annobón (Table 2). We homogenized data of
Exell, adding Pteridophytes. We have considerated the 14 strictly endemic species from Annobón and those that
also grow in São Tomé and /or Príncipe. After our own data, the degree of endemicity has decreased due to the
increase of the total species number.
TABLE 2. Number and percentage of endemic species from Annobón.
All these indexes and re-evaluated estimations are pointing in one direction, Annobón’s oceanic features are
being reduced probably due to the human impact and increase of anthropic influence. This is also indicated by the
increase observed in the number of introduced species, 257%, higher than the observed for the general data.
It is difficult to evaluate the conservation status of the endemic species of Annobón by the strict application of
IUCN criteria (IUCN, 2012). Due the small area of the island (17km
2
) all endemics should be classed directly at
least as Vulnerable (VU D2).
Eight Annobón endemics have not been found in the last 50 years. Although according to the IUCN
assessments they could be classed as Extinct, we consider more realistic a conservative approach and not to
confirm the total absence of these species until more data are available. The application of Criteria A and B as
described before classes them as Critically Endangered (CR) (Appendix 2). They should be tagged as Probably
Extinct in order to highlight the relevance of the Flora of the island and to describe the threats it is facing in absence
of conservation plans. Six Annobón endemics have been collected recently, and from our precautionary approach
they are proposed here as Endangered (EN), since their situation is not as critical as the aforementioned. Three
more endemics, but shared with São Tomé and Príncipe Island are proposed as Vulnerable. Previous proposals by
Annobón (Exell 1944) Annobón (Exell 1973) Annobón (own data)
Pteridophyta 34 51
Spermatophyta
(native)
115 146 222
Spermatophyta
(introduced or cultivated)
28 62 73
Significant Taxa (only native) 149 292
Total 177 208 + Pteridophyta 365
Exell (1944) Davis & Figueiredo (2007) Own data
Nº endemics 17 20 23
Percent 11.4 % 10 % 7.8 %
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CHECKLIST OF THE VASCULAR PLANTS OF ANNOBÓN
Davis & Figueiredo (2007) have been adaptated to the mentioned criteria. Similar adaptations have been suggested
for those included by IUCN (2011). It is clear that more data are needed to properly evaluate the conservation
status of each of these endemic species. We consider essential to include these taxa with their proposed status in the
red list in order to set up their conservation actions as Annobón’s conservation priorities.
The most represented families are Leguminosae, Gramineae and Orchidaceae (Table 3). Apart from
Leguminosae and Gramineae which are represented by many widespread herbs, the most notable feature is the
relatively high numbers of Orchidaceae, Rubiaceae and Euphorbiaceae species, which was also noted by Exell
(1944: 49).
TABLE 3. Number of taxa of the most represented families of vascular plants from Annobón and São Tomé, according
to different sources.
VI. Acknowledgments
This work was financed by the Spanish Government through the Research Project CGL2012-32934. M. de la
Estrella was funded by a Juan de la Cierva grant (JCI–2009–05243) of the Spanish Ministry of Science.
We are indebted to the curators and staff of the herbaria mentioned in the text for kindly providing specimens
and other material for study. L. Rico from K, T. Feuerer from HBG and P.A. Schaefer from MPU helped in locating
critical material. We are grateful to J.L. Fernández Alonso, R. Morales and A. Quintanar for their assistance to
identify some groups. Anne for her help with the English revision. A. Martín Ciudad gave us technical support, and
G. Velayos help us with the labeling and ordination of some of the collections of Annobón. F. Domínguez aided us
with conservation assessments. Collection trips would not have been possible without the enthusiastic support of
our Equatoguinean friends: the staff of the UNGE leadered by the Dean, Jose Manuel Esara, Norberto Teruel
Mandrá, Benjamín Panadés Menejal, Eduardo Mejias Villahute, Ricardo Nach Dueso, Michel Quiñones, Lola
(Laurence) Schoettel, and many others gave us their kind assistance during field trips.
We thank the editor and anonymous reviewers for their critical reviews of the manuscript and for their helpful
suggestions during the editing process.
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Index of scientific names
Accepted names are in bold type, including the cultivated species; synonyms are in italics; the
varieties and doubtful or erroneus records are in normal type.
Abildgaardia Vahl
monostachya (L.) Vahl ................................................. 18
ovata (Burm.f.) Kral .................................................... 18
Abrus L.
precatorius L. .............................................................. 36
Acalypha L.
annobonae Pax & K.Ho ffm. ....................................... 32
Achyranthes L.
aspera L. ...................................................................... 26
var. aspera .................................................................... 26
Adansonia L.
digitata L. .................................................................... 40
Adenia Forssk.
lobata (Jacq.) Engl. ...................................................... 45
rumicifolia Engl. & Harms ......................................... 45
var. miegei (Aké Assi) W.J.de Wilde ................... 45
var. rumicifolia ...................................................... 45
Adenostemma L.
perrottetii DC. ............................................................. 28
Adiantum L.
mettenii Kuhn............................................................... 14
philippense L................................................................ 14
soboliferum Wall........................................................... 14
Aerangis Rchb.f.
megaphylla Summerh. ................................................. 22
phalaenopsis Schltr....................................................... 23
stelligera Summerh. ...................................................... 23
Agelaea Sol ex Planch.
annobonensis G.Schellenb. ........................................... 31
ovalis G.Schellenb. ....................................................... 31
pentagyna (Lam.) Baill. ............................................... 31
Ageratum L.
conyzoides L.
subsp. conyzoides ................................................. 28
Alectra Thunb.
sessiliflora (Vahl) Kuntze ............................................ 49
var. monticola (Engl.) Melch. .............................. 49
Allamanda L.
cathartica L. ............................................................... 28
Alsophila R.Br.
manniana Hook. .......................................................... 11
Alternanthera Forssk.
littoralis P.Beauv. ....................................................... 26
var. littoralis ......................................................... 26
maritima (Mart.) A.St.-Hil. ......................................... 26
sessilis (L.) DC. ........................................................... 26
Alysicarpus Desv.
vaginalis (L.) DC. ....................................................... 36
Amaranthus L.
dubius Mart. ex Thell. ................................................. 26
hybridus L.
subsp. incurvatus (Gren. & Godr.) Brenan................... 26
spinosus L. ................................................................... 26
viridis L. ....................................................................... 27
Anacardium L.
occidentale L.................................................................52
Ananas Mill.
comosus (L.) Merr.........................................................17
Andropogon L.
contortus L.....................................................................20
Annona L.
muricata L. ...................................................................16
reticulata L. .................................................................. 16
squamosa L. .................................................................. 16
Anthephora Schreb.
cristata (Döll) De Wild. & T.Durand ..........................20
Antidesma L.
membranaceum Müll.Arg..............................................33
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vogelianum Müll.Arg. ..........................................................33
Aristida L.
adscensionis L. ..............................................................20
Arthropteris J.Sm. ex Hook.f.
orientalis (J.F.Gmel.) Posth. .........................................15
Artocarpus J.R.Forst. & G.Forst.
altilis (Park.) Fosberg ....................................................43
communis J.R.Forst. & G.Forst......................................43
heterophyllus Lam. ...................................................... 43
Asclepias L.
curassavica L. ...............................................................28
Asplenium L.
africanum Desv. 10
var. subintegrum C.Chr. ........................................ 10
anisophyllum Kunze .....................................................10
annobonense Mildbr. ex Viane .....................................10
currori Hook. .................................................................10
geppii Carruth. ...............................................................10
nigritianum Hoo k. ........................................................10
sandersonii Hook. .........................................................10
variabile Hook...............................................................10
Asystasia Blume
gangetica (L.) T.Anderson ............................................25
Avicennia L.
germinans (L.) L . ...........................................................53
Bambusa Schreb.
vulgaris Wendl. ex Nees. ..............................................20
Basella L.
alba L. ............................................................................30
Beckeropsis Fig. & De Not.
laxior Clay ton ................................................................22
Begonia L.
ampla Hook.f.................................................................30
annobonensis A.DC. .....................................................30
Bertiera Aubl.
annobonensis G.Tay lor .................................................46
laxa Benth. .....................................................................46
pedicellata (Hiern) Wernham .........................................46
Bidens L.
pilosa L. ........................................................................ 29
Blechnum L.
attenuatum (Sw.) Mett................................................. 10
Boerhavia L.
coccinea Mill. ............................................................... 44
diffusa L. ...................................................................... 44
Bolusiella Schltr.
talbotii (Rendle) Summerh. .......................................... 23
Borreria Mey
ocymoides (Burm.f.) DC............................................... 48
verticillata (L .) Mey ..........