Tariq Stévart

Tariq Stévart
Missouri Botanical Garden · Africa and Madagascar

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413
Publications
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Publications

Publications (413)
Technical Report
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We propose a floristic description of the montane savannas of the Nimba, an interpretation in terms of ecosystem typology, and a discussion on the spatial distribution and geomorphology, based on a discussion of the literature and vegetation plots surveyed during a field visit. The dynamics of the different types of savannas is then discussed and a...
Article
Oceanic islands have played an important role in our understanding of the diversification of organisms, and phylogenetic estimates have been used in this context to investigate the origin of island diversity and its relationship to the continent. Using a typical orchid genus rich in island endemics and with widespread continental relatives, we aim...
Article
Endemism is one of the most important concepts in biogeography and is often used to guide biodiversity conservation, yet our understanding of the determinants of endemism in many biodiverse tropical regions is limited. This is true for western Central Africa, a region with one of the highest levels of plant diversity in tropical Africa, where endem...
Article
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Background and objectives—Podocarpus latifolius (synonym of P. milanjianus) is a key tree representative of Afromontane forests where it is highly threatened by climate and land-use changes. While large populations occur in East Africa, only a few isolated and usually small populations remain in western Central Africa (Cameroon to Angola). Studying...
Technical Report
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Allexis obanensis has most recently been assessed for The IUCN Red List of Threatened Species in 2020. Allexis obanensis is listed as Endangered under criteria B2ab(i,ii,iii,iv,v).
Technical Report
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Allophylus imenoensis has most recently been assessed for The IUCN Red List of Threatened Species in 2020. Allophylus imenoensis is listed as Endangered under criteria B2ab(iii).
Technical Report
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Aphanocalyx pectinatus has most recently been assessed for The IUCN Red List of Threatened Species in 2020. Aphanocalyx pectinatus is listed as Endangered under criteria B2ab(iii).
Technical Report
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Allophylus mayimbensis has most recently been assessed for The IUCN Red List of Threatened Species in 2020. Allophylus mayimbensis is listed as Endangered under criteria B2ab(iii).
Technical Report
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Allophylus ngounyensis has most recently been assessed for The IUCN Red List of Threatened Species in 2020. Allophylus ngounyensis is listed as Endangered under criteria B2ab(iii).
Technical Report
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Allophylus poungouensis has most recently been assessed for The IUCN Red List of Threatened Species in 2020. Allophylus poungouensis is listed as Vulnerable under criteria B2ab(i,ii,iii,iv,v).
Technical Report
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Chaetocarpus gabonensis has most recently been assessed for The IUCN Red List of Threatened Species in 2020. Chaetocarpus gabonensis is listed as Vulnerable under criteria B1ab(iii)+2ab(iii).
Technical Report
Full-text available
Aulacocalyx pallens has most recently been assessed for The IUCN Red List of Threatened Species in 2020. Aulacocalyx pallens is listed as Vulnerable under criteria B2ab(i,ii,iii,iv,v).
Technical Report
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Aulacocalyx pallens subsp. letestui has most recently been assessed for The IUCN Red List of Threatened Species in 2020. Aulacocalyx pallens subsp. letestui is listed as Vulnerable under criteria B2ab(iii).
Technical Report
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Crateranthus letestui has most recently been assessed for The IUCN Red List of Threatened Species in 2020. Crateranthus letestui is listed as Vulnerable under criteria B2ab(iii).
Technical Report
Full-text available
Crateranthus congolensis has most recently been assessed for The IUCN Red List of Threatened Species in 2020. Crateranthus congolensis is listed as Endangered under criteria B2ab(iii).
Technical Report
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Dactyladenia gilletii has most recently been assessed for The IUCN Red List of Threatened Species in 2020. Dactyladenia gilletii is listed as Vulnerable under criteria B2ab(ii,iii,iv,v).
Technical Report
Full-text available
Memecylon biokoense has most recently been assessed for The IUCN Red List of Threatened Species in 2020. Memecylon biokoense is listed as Endangered under criteria B1ab(iii)+2ab(iii).
Technical Report
Full-text available
Magnistipula cupheiflora subsp. cupheiflora has most recently been assessed for The IUCN Red List of Threatened Species in 2020. Magnistipula cupheiflora subsp. cupheiflora is listed as Vulnerable under criteria B2ab(iii).
Technical Report
Full-text available
Pavetta owariensis var. opaca has most recently been assessed for The IUCN Red List of Threatened Species in 2020. Pavetta owariensis var. opaca is listed as Vulnerable under criteria B2ab(i,ii,iii,iv,v).
Technical Report
Full-text available
Polyscias letestui has most recently been assessed for The IUCN Red List of Threatened Species in 2020. Polyscias letestui is listed as Endangered under criteria B2ab(iii).
Technical Report
Full-text available
Raphia gabonica has most recently been assessed for The IUCN Red List of Threatened Species in 2020. Raphia gabonica is listed as Endangered under criteria B2ab(iii).
Technical Report
Full-text available
Syzygium gilletii has most recently been assessed for The IUCN Red List of Threatened Species in 2020. Syzygium gilletii is listed as Vulnerable under criteria A3c.
Technical Report
Full-text available
Rinorea ebolowensis has most recently been assessed for The IUCN Red List of Threatened Species in 2020. Rinorea ebolowensis is listed as Vulnerable under criteria B2ab(i,ii,iii,iv,v).
Chapter
Citation: Stévart, T., Pauwels, O.S.G. & Vande weghe, J.P. 2021. Chapter 11. Conservation. Pp. 316-323 in: Vande weghe, J.P. & Stévart, T. (eds). The Ogooué Delta. Missouri Botanical Garden Press, Saint Louis: 328 pp.
Article
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Background and aims-A recent taxonomic and molecular study of the genus Cyrtorchis revealed three new species. Here, we describe one of these new species, endemic to the Cameroon Volcanic Line (CVL), and compare it to its closest relatives. Its conservation status is provided along with detailed information on its ecology and reproductive biology....
Article
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Over the last several years, the IUCN Red List approach for assessing the risk of extinction faced by species has been adapted into a Red List of Ecosystems methodology. This endeavor faces several important challenges, including how to define the types of ecosystems to which the Red List criteria are applied, and how to manage information on the g...
Article
Here we describe and illustrate two new species of angraecoid orchids from East Africa, Tridactyle delepierrei and Ypsilopus iversenii, respectively from Albertine Rift (Rwanda and Uganda) and west Usambaras (Tanzania). The first species is closely allied to the three species of Tridactyle sect. Eggelingiae and to Tridactyle nalaensis. The second s...
Article
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The genus Cyrtorchis is renowned for its conspicuous white, long‐spurred flowers, but also for its challenging problems of species delimitation due to the great morphological resemblance of their flowers. Based on a preliminary visual inspection of 1752 specimens, 27 morphogroups were defined including 6 unpublished taxa. Then, we used a representa...
Article
The High Conservation Value (HCV) concept, developed by the Forest Stewardship Council to promote sustainable forest management, is widely employed for certification of forestry and agriculture concessions, and has been adopted by many logging and palm oil companies. HCV criterion 1, which deals with “endemic, and rare, threatened or endangered spe...
Technical Report
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Eugenia ogoouensis is a small tree up to 5 cm in diameter, known from mature or secondary terra firme forest, riverside forest, flooded forest, and swamp forest, between 10 and 110 m in elevation. The species is endemic to Gabon and is known from 22 collections, the oldest three of which were made in 1912 by Fleury in the vicinity of Nkogo in the O...
Technical Report
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Cassipourea dinklagei is a small shrub up to 2.5 m high, known from terra firme forest, exploited or mature, or from wet valley bottoms, rarely swampy. One collection was made in the coastal forest. Its known altitudinal amplitude is 20 to 65 m. The species is probably endemic to Cameroon. Six collections from Gabon have been identified as belongin...
Technical Report
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Warneckea macrantha is a large tree up to 30 m tall, known from periodically inundated forests near rivers, between 10 and 130 m in elevation. The species is endemic to Central Africa, occurring in Gabon and the Republic of the Congo. It is known from 12 collections, of which 11 were made in Gabon and one in the Republic of the Congo. It has first...
Technical Report
Full-text available
Magnistipula devriesii is a shrub or a small tree, up to 6 m tall, known from mature and secondary terra firme forest between 100 and 150 m in elevation. The species is endemic to Gabon and is known from two collections made by Breteler in 1994 in the region of Ndjolé (Moyen-Ogooué), about 10 km and 20-30 km north-northwest of the city, thus repres...
Technical Report
Full-text available
Rothmannia jollyana is a treelet up to 5 m high, known from the undergrowth of terra firme forest, between 300 and 600 m in elevation. The species is endemic to Central Africa, occurring in Gabon, the Republic of the Congo, and Angola (Cabinda). It is known from seven collections made between 1876 and 1987, of which one was collected by Soyaux in 1...
Technical Report
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Memecylon salicifolium is a small tree, known from terra firme forest and edge of the savannah, between 400 and 600 m in elevation. The species is endemic to Gabon and is known from five collections from three localities: Bélinga (Ogooué-Ivindo) in the north-eastern part of the country (Hallé 566; 2919; 3824, collected in 1964 and 1966), Ndjolé (Mo...
Technical Report
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Polyscias aequatoguineensis is a shrub or a small tree up to 6 m tall, known from inselbergs, at the edges of exposed rocks, between 600 and 800 m in elevation. The species is endemic to Atlantic Central Africa, occurring in Gabon and Equatorial Guinea. It is known from eight collections, of which five (three occurrences) were made between 1998 and...
Technical Report
Full-text available
Lychnodiscus brevibracteatus is a tree up to 20 m high and up to 50 cm in diameter, known from terra firme forest, and sometimes in swamp forest, between 100 and 300 m in elevation. The species is endemic to Central Africa occurring in Gabon and Cameroon. It is known from six collections, of which four were made in Gabon between 1925 and 2007 and t...
Technical Report
Full-text available
Memecylon mouririoides is a tree up to 20 m high and 45 cm in diameter, known from mature terra firme forest, between 200 and 300 m in elevation. The species is endemic to Gabon and is known from two collections, of which one was made by Le Testu in 1924 between Guidouma and Saint-Croix (Ngounié province), and one by Reistma in 1985 in the Moukalab...
Technical Report
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Pauridiantha pleiantha is a tree up to 12 m high, known from terra firme forest, between 100 and 400 m in elevation. The species is endemic to Gabon and is known from six collections from the Moukalaba-Doudou National Park area (Ogooué-Maritime and Nyanga province). These six collections represent six occurrences and one subpopulation. Considering...
Technical Report
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Pauridiantha smetsiana is a tree up to 7 m high, known from terra firme forest, between 20 and 100 m in elevation. The species is endemic to Gabon and is known from 20 collections and 1 human observation, of which 19 were made between 1990 and 2014 in the region of Rabi in the Ogooué-Maritime province. Two other collections were made in 1991 in the...
Technical Report
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Rhaptopetalum rabiense was preliminarily assessed according to the IUCN Red List Categories and Criteria as part of the publication of the species by Kenfack and Nguema in 2019 as Critically Endangered. However, this evaluation was not published on the IUCN website. We hereby propose an update of this assessment. Rhaptopetalum rabiense is a tree u...
Technical Report
Full-text available
Rinorea apertior is a shrub or a small tree up to 7 m high, known from secondary terra firme forest, between 30 and 110 m in elevation. The species is endemic to Gabon and is known from 11 collections, of which seven were made between 1989 and 1995 in the region of Rabi in the Ogooué-Maritime province. Two others were made in 2011 by Maas in the re...
Technical Report
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Cleistanthus bambidianus is a non timber tree up to 20 m high known from mature forests up to 500 m elevation. The species is endemic to Gabon and known from 12 collections made in the Ogooué Ivindo province (south of Ayem; Forêt des Abeilles; and twice in CFAD Rougier Ivindo) and in the Ogooué-Lolo province (five times NE of Lastourville; at Koula...
Technical Report
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Englerodendron triplisomere is a small rainforest tree up to 9 m tall and 7 cm dbh, known from lowland and submontane terra firme forests, and found between 50 and 1,000 m elevation. It is morphologically separated from other Englerodendron spp. by leaves 2-jugate, rarely 1-jugate or unifoliolate, but then 2-jugate leaves also present; sepals with...
Technical Report
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The species has been assessed as VU D2 by the World Conservation Monitoring Centre in 1998. These assessors only included the type collection known from a forested area around Tchibanga in Gabon, and mentioned that the species may be more widespread given that the country's forests are relatively unexplored. However, they considered that many fores...
Technical Report
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Englerodendron hallei is a small tree up to 7 m height, known from mature terra firme forests and riverside forests, between 5 and 500 m elevation. The species is endemic to Gabon and known from 17 herbarium collections and four human observations, that were mainly collected/observed in the Estuaire province (16 collections and the four human obser...
Technical Report
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Craibia macrantha is a tree up to 20 m high found in lowland forest, between 350─460 m elevation. The species occurs in Gabon and in the Republic of the Congo. It is known from four collections representing four occurrences, of which three were made in Gabon by Le Testu (7992) in 1930 near the city Koulamoutou, by Breteler (14795) in 1999 east of t...
Conference Paper
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This paper argues that the conceptualization of the interplay of 'natural' and 'anthropogenic' influences in shaping tropical forest landscapes is hindered by a debate between two opposing concepts and their supporters: 'disturbance' versus 'domestication'. The former is the standard concept in ecology, wherein anthropogenic influences are seen as...
Article
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Angraecoid orchids present a remarkable diversity of chromosome numbers, which makes them a highly suitable system for exploring the impact of karyotypic changes on cladogenesis, diversification and morphological differentiation. We compiled an annotated cytotaxonomic checklist for 126 species of Angraecinae, which was utilised to reconstruct chrom...
Technical Report
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The aim of this report consists in identifying ecosystems of special conservation value in order to review the current Key Biodiversity Areas (KBAs) in the Lofa-Gola-Mano and Nimba complexes (Guinea, Liberia, Sierra Leone, Ivory Coast), using up-to-date international standards (Bland et al. 2015; KBA Standards and Appeals Committee 2019; Rodriguez...
Technical Report
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Cordia stenoloba is a small tree to 10 m tall, found in dense lowland forest and in undergrowth near a river, around 490 m in elevation. The species is known from six collections made in Cameroon (three in the Centre Region) and Gabon (one in Ogooué-Ivindo and one in Ogooué-Lolo provinces). In Cameroon, the species was collected from Forestry Reser...
Technical Report
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Synsepalum ogouense is a small tree up to 7 m with pubescent stipules and with very small flowers in few fascicles in the axils of the leaves, known from the undergrowth of the terra firme forest around 300 m in elevation. The species is endemic to Gabon and is only known from one collection, thus one occurrence, made by Le Testu in 1929 in the reg...
Technical Report
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Trichoscypha debruijnii is a treelet up to 5 m tall and 3-5 cm in diameter with tomentellous branchlets and hairs stellate, known from the undergrowth of the terra firme forest around 300 m in elevation. The species is endemic to Gabon and is only known from one collection, thus one occurrence, made by Maesen in 1988 in the region of Lastourville i...
Technical Report
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Rinorea abbreviata is a small tree up to 8 m, known from terra firme humid forest at 240 m in elevation. The species is endemic to Gabon and is only known from one collection, thus one occurrence, made by Breteler in 1991 in Missanga, 5-15 km north-west of Ndjolé (Moyen-Ogooué). Based on a 2 km x 2 km cell size, the AOO is estimated as 4 km2, below...
Technical Report
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Uvariodendron molundense var. citrata is a shrub up to 5 m tall, with lemongrass-like bark, known from the edge between the slope forest and the crest thicket, on a rocky plateau with shallow soil, from 800 to 950 m in elevation. The species is endemic to Gabon and is restricted to the region of Belinga, northeast of Gabon (Ogooué-Ivindo province)....
Technical Report
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Rhaptopetalum belingense is a shrub up to 6 m high, known from forest vegetation at the edge of savanna, and terra firme forest, between 650 and 900 m in elevation. The species is endemic to Gabon and is known from two collections, thus two occurrences, one made by Hallé in 1966 in the region of Belinga, northeast of Gabon (Ogooué-Ivindo province)...
Technical Report
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Octoknema belingensis is a tree up to 12 m tall, known from rocky bed of permanent creek in closed high forest, around 850 m in elevation. The species is endemic to Gabon and is only known from one collection, thus one occurrence, made by Breteler in 1978 in the Belinga mountains in the Ogooué-Ivindo province. Based on a 2 km x 2 km cell size, the...
Technical Report
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Gilbertiodendron barbulatum is a tree up to 25 m tall and 20 cm in diameter, known from terra firme forest around 275 m in elevation. The species is endemic to Gabon and is only known from one collection, thus one occurrence, made by Le Testu in 1927 near Maghounga in the Ngounié province. Based on a 2 km x 2 km cell size, the AOO is estimated as 4...
Technical Report
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Erythrina wieringae is a large tree, up to 28 m tall, known from evergreen terra firme forest, around 500 m in elevation. The species is endemic to northeastern Gabon, and is only known from one collection, thus one occurrence, made by Wieringa in 2000 between Makokou and Mékambo (Ogooué-Ivindo province). Based on a 2 km x 2 km cell size, the AOO i...