Leslie Landrum

• PhD University of Michigan, 1980
• Curator Emeritus at Arizona State University

The taxonomy of Neotropical Myrtaceae is known for the difficulties regarding specific and supraspecific taxonomic delimitations. In subtribe Myrciinae (tribe Myrteae) this situation is intensified due to the high diversity of species and relatively homogeneous morphology. Over the last two decades there has been a huge increase in Myrciinae system...

The governance of the nomenclature of algae, fungi, and plants as prescribed by the International Code of Nomenclature for algae, fungi, and plants is presently undemocratic in six ways: (1) the selection of the officers of nomenclature and the committee members ; (2) restricted attendance to the Nomenclature Section because of the expense of atten...

The genus Psidium in the Greater Antilles is revised and a key to the species is provided. Each of the 16 recognized species is described, illustrated, a map of known occurrences in the Greater Antilles is provided, and representative specimens are cited. Specimens from the Caribbean region are sometimes included in the maps for wide-ranging specie...

A response is provided to the Rapporteurs’ comments on Proposal 193 to amend the Shenzhen Code . If adopted, Prop. 193 would amend Div. III, Prov. 5 of the Code so as to require a simple majority to approve—as opposed to the current 60% majority to reject (and thus 40% + 1 vote to approve)—General Committee recommendations on conservation, protecti...

Psidium L. (Myrtaceae) es un género nativo del continente americano, del cual se conocen al menos 60 especies distribuidas en el Caribe y desde México hasta Argentina. Este trabajo presenta el tratamiento taxonómico de Psidium para Colombia, basado en trabajo de campo y el estudio de cerca de 1000 especímenes depositados en 38 herbarios. En Colombi...

a new species, Psidium urquiolanum, from eastern Cuba is described, illustrated, and its distribution is mapped. It has previously been incorrectly identified as P. calycolpoides, a species now assigned to Mosiera. the differences between Psidium and Mosiera are discussed. Resumen Se describe, se ilustra y se provee un mapa para esta nueva especie...

Species of Myrtaceae Juss., the ninth largest family of flowering plants, are a valuable source of bioactive specialized metabolites. A leading position belongs to phloroglucinol derivatives, thanks to their unusual structural features and biological and pharmacological properties. Myrcianthes cisplatensis (Cambess.) O. Berg, a common tree on the b...

The genus Psidium in Bolivia and Paraguay is revised and a key to the species is provided. Each of the 18 recognized species is described, illustrated, and a map of known occurrences in Bolivia and Paraguay is provided and representative specimens are cited. Specimens from adjacent countries are sometimes included in the maps and representative spe...

These proposals would make attendance at a Nomenclature Section open to a wider audience and therefore more democratic.

The Special-purpose Committee on Virtual Participation in the Nomenclature Section was established by the XIX International Botanical Congress (IBC) in Shenzhen, China in 2017, with the mandate "to investigate the possibility of and mechanisms for virtual participation and voting in the Nomenclature Section of an International Botanical Congress vi...

In this paper a neotype is chosen for Myrtus luma, a name first proposed by J.I. Molina in 1782 and the basionym of the currently used name, Amomyrtus luma; the illegitimate name Campomanesia sessiliflora var. lanuginosa is formalized with a new description and type; a new variety is described, Psidium striatulum var. rondoniense; and lectotypes ar...

Guava (Psidium guajava L., Myrtaceae) is a Neotropical fruit that is widely consumed around the world. However, its evolutionary history and domestication process are unknown. Here we examine available ecological, taxonomic, genetic, archeological, and historical evidence about guava. Guava needs full sunlight, warm temperatures, and well-distribut...

The Southwest Environmental Information Network (SEINet) is a consortium of herbaria from the United States, Canada, and Mexico that collectively provide a database of digitized specimens worldwide in scope but principally from North America. The SEINet Portal Network is one of many natural history collection databases that uses Symbiota software....

We present a computer program, NEARBY, that uses databases of georeferenced specimens to explore plant and lichen distributions and co-occurrences. NEARBY utilizes three SYMBIOTA databases: SEINet (mainly vascular plants of North America), NEOTROPICAL (mainly vascular plants of neotropical and temperate South America), and CNALH (lichens, mainly of...

This publication presents the current state of knowledge concerning the origin, history, culture and trade of guava throughout the world. The fruit composition and processing, as well as fruit set, development and maturation are described. The propagation, biotechnology, nutrition, irrigation, orchard management, flowering, physiological disorders,...

As a result of botanical explorations carried out in the seasonally dry forests and shrub-lands of the eastern end of the Araya Peninsula, state of Sucre, Venezuela, the presence of Psidium schenckianum Kiaersk. is reported for the first time for Venezuela and Psidium appendiculatum Kiaersk. for the first time for Sucre. Due to the current degradat...

Increased sampling in under-collected areas and the digitization of herbarium collections have led to recent findings revealing the high diversity and endemism of the genus Psidium in the state of Bahia. This paper describes a new species of Psidium (Myrtaceae, Myrteae) occurring in the Caatinga biome of Bahia in Northeastern Brazil. It is a shrub...

Two new records of Myrtaceae (Myrcia ishoaquinicca and Psidium acidum) for the Amazonian forests of Caquetá, Cauca, and Putumayo departments, Colombia, are reported. Comments about the habitats in which these species are growing, as well as observations on their expanded distribution ranges, are included.

Two new records of Myrtaceae (Myrcia ishoaquinicca and Psidium acidum) for the Amazonian forests of Caquetá, Cauca, and Putumayo departments, Colombia, are reported. Comments about the habitats in which these species are growing, as well as observations on their expanded distribution ranges, are included.

The SEINet Portal Network has a complex social and development history spanning nearly two decades. Initially established as a basic online search engine for a select handful of biological collections curated within the southwestern United States, SEINet has since matured into a biodiversity data network incorporating more than 330 institutions and...

The genus Psidium in the state of Bahia, Brazil is revised and a key to the species is provided. Each of the 28 recognized species is described, illustrated, and a map of known occurrences in Bahia is provided; representative specimens are cited; distinguishing features, phenology, habitat, and distribution are all discussed. Three species are appa...

Participating in, and voting at, the Nomenclature Section of an International Botanical Congress is neither simple nor easily affordable. The technology of virtual meeting attendance and electronic voting should presently be sufficient to allow people from around the world to participate in the Nomenclature Section and thus make the process of nome...

The Special Committee on By-laws for the Nomenclature Section was established at the XVIII International Botanical Congress (IBC) in Melbourne in 2011, with the mandate to formalize the procedures by which changes to the Code are considered and voted upon by the Nomenclature Section, and to report to the XIX IBC in Shenzhen in 2017. With the wider...

Psidium guayaquilense from western Ecuador is described and illustrated. It is most similar to P. acidum, having in common with it non-angular, rounded seeds, anthers with a few subequal glands and peduncles with wings. Psidium guayaquilense differs from P. acidum in various ways, most notably in the principal marginal veins mainly 1–3 mm from marg...

Psidium acutangulum has been previously understood as a widespread and variable species. Here, it is proposed that populations east of the Andes should be divided into two species: P. acutangulum and P. acidum based on characters of the leaves, anthers, fruits and seeds. The new combination Psidium acidum is made here and the species is described,...

The SEINet database of herbarium specimens was queried with two new computer programs, PROXIMITY and CORRELATION, to discover associations between 81 species of trees and shrubs of central Arizona based on the associated-species field and coordinate data. Many associations correspond to previously described biotic communities. Various approaches to...

Psidium sobralianum from northeastern Brazil is described and illustrated. It seems to be most similar to P. bahianum. Psidium sobralianum differs from P. bahianum in various ways: leaf ratio usually greater than 2 times as long as wide (versus generally less than 2 in P. bahianum); peduncles 1–5 mm long (versus 12–38 mm long in P. bahianum); matur...

Psidium occidentale from Colombia and Ecuador is described and illustrated. It is compared with its presumed closest relatives, and differs from them by its larger leaves and multi-flowered inflorescences. It generally grows at lower elevations than these other species. Its conservation status is evaluated.

During field collections for the doctoral thesis of the first author, a population of Myrceugenia was found in a gallery forest along Bananal stream in the Distrito Federal, Brazil. This population was recognized as a new species related to Myrceugenia glaucescens and M. acutata, separated by 800 km or more from previously known populations of thos...

A new species, Mosiera nipensis (Myrtaceae), from the crest of the Sierra de Nipe, Cuba, is described and illustrated. This species is readily distinguished from all other species of Mosiera by two diagnostic characters: four-angled, slightly four-winged young twigs, and calyx lobes that are valvate in the bud. We suspect that this species grows on...

Pimenta racemosa var. racemosa (Mill.) J.W. Moore, is a Caribbean arboreal plant belonging to the family Myrtaceae with a special interest in their leaves for the production of essential oil, commonly known as "Bay-Rum". Steam distillation of fresh leaves collected in April 2012 produced two types of essential oil, one of these resulted lighter tha...

Pimenta racemosa var. racemosa (Mill.) J.W. Moore, is a Caribbean arboreal plant belonging to the family Myrtaceae with a special interest in their leaves for the production of essential oil, commonly known as "Bay-Rum". Steam distillation of fresh leaves collected in April 2012 produced two types of essential oil, one of these resulted lighter tha...

Results of studies with multiple approaches involving a species complex which includes Campomanesia xanthocarpa (Myrtaceae) indicate that specimens collected in Morro do Chapéu, the northern region of the Chapada Diamantina, Bahia, are distinct from those distributed farther south in Brazil. A description, comments, distribution map and an illustra...

Supported by a United States American Recovery and Reinvestment Act grant, we have developed a workflow, "the SALIX Method", to image, database, and provide web access to ca. 60,000 Latin American plant specimens housed at the Arizona State University Herbarium. The SALIX Method incorporates optical character recognition using ABBYY FineReader and...

The floristic account of Campomanesia (Myrtaceae) from Bahia State, Brazil, is presented. Sixteen taxa are recognized. Keys to identification, together with descriptions, illustrations, general notes on taxa and species distribution maps are provided.

Based on a taxonomic study of Campomanesia Ruiz & Pavón in the state of Bahia, Brazil, we observed that C. ilhoensis Mattos and C. viatoris Landrum belong to the same taxonomic entity. Both names are legitimate and validly published; however, C. ilhoensis has priority over C. viatoris, which has been in use since 1984. In addition, the distribution...

Myrceugenia is a genus endemic to South America with a disjunct distribution: 12 species occurring mainly in central Chile and approximately 25 in southeastern Brazil. Relationships are reconstructed within Myrceugenia from four plastid markers (partial trnK-matK, rpl32-trnL, trnQ-5'rps16 and rpl16) and two ribosomal nuclear regions (ETS and ITS) u...

The foliar oil of Myrcianthes fragrans (Sw.) McVaugh (Myrtaceae), which was collected in Jamaica, was examined by GC/MS. It was found that the oil was dominated by limonene (55.99%) and α-terpineol (10.85%) with lesser amounts of 1,8-cineole (7.09%) and α-pinene (6.92%).

Abstract Myrcianthes irregularis McVaugh, a rare and endemic species of Ecuador, is transferred to Amomyrtella Kausel. A key is provided for the two species of Amomyrtella. key worDs: Myrtaceae, Amomyrtella, Rivero y Ustariz resumen Myrcianthes irregularis McVaugh, una especie escasa y endémica de Ecuador, se translada a Amomyrtella Kausel. Se pre...

The essential oils isolated from the fresh leaves of Eugenia pitanga cultivated in Arizona, from seed originally collected in Paraguay, were analyzed by GC and GC/MS. The major components of the oil were (E)-β-ocimene (24.1±3.2%), germacrene D (20.8±2.4%), bicyclogermacrene (10.9±1.4%), and (Z)-β-ocimene (10.4±1.4%)

Para avaliar a utilidade de caracteres morfoanatômicos na identificação de materiais botânicos de Campomanesia Ruiz & Pavón, especialmente aqueles estéreis, o padrão de nervação foliar e a configuração do arco vascular no pecíolo de 15 táxons presentes no estado da Bahia foram analisados. O padrão de nervação secundário camptódromo-broquidódromo mo...

(Application of morpho-anatomical leaf characters in Campomanesia Ruiz & Pavon (Myrtaceae) taxonomy). To evaluate the utility of morpho-anatomical leaf characters in the identification of botanic material of Campomanesia Ruiz & Pavon, especially when sterile, leaf venation pattern and shape of the vascular arch in the petiole of 15 taxa in Bahia st...

A new species of Campomancsia Ruiz et Pa v., collected by Blanchet in Bahia, Brazil, is here recognized. A description, discussion, images of collections and a key comparing Campomanesia blancheliana Landrum & Ibrahim with two similar species, C. eugemoides (Cambess.) Legrand and C cspintosantcnsis Landrum, are provided.

Se revisa la sistemática de Amomyrtus, un género endémico del sudoeste de América del Sur.En los estudios moleculares el género aparece como monofilético, siendo sus parientes máscercanos los géneros americanos Legrandia y Pimenta. Se elige un lectotipo para Myrcialechleriana Miquel The systematics of Amomyrtus, an endemic genus of southwestern tem...

The genus Calycolpus (Myrtaceae), a mainly northern South American group of 15 species, is revised based on a study of over 600 plant collections, many duplicated in more than one herbarium. The relationships of Calycolpus to other genera are discussed and a key distinguishing it from its relatives is provided. All species are described, mapped, an...

Two new species of Psidium L. (Myrtaceae) from Bahia, Brazil, are described and illustrated. Both are compared with P. cattleyanum Sabine, a possible close relative and a species with which they might be confused. Both species differ from P. cattleyanum because of their longer peduncles (2–8(–13) mm in P. cattleyanum, 10–22 mm in P. ganevii Landrum...

The essential oils isolated from the oleo-gum-resins of elephant tree or torote (Bursera microphylla A. Gray, Burseraceae) collected in Arizona were analyzed by GC and GC/MS. The major components of the oil were β-caryophyllene (35.7–72.9%) and myrcene (0.4–14.4%).

Two new species of Calycolpus from Brazil are described and illustrated, C. andersonii from Pará and C. sessiliflorus from Bahia.

In the course of monographic work in Myrtaceae it has become evident thatEugenia prismatica cannot be accommodated within any existing genus in the family. Therefore, a new genus,Curitiba, is described to contain it and the new combinationCuritiba prismatica is made.Curitiba is diagnosed by a combination of 4-angled hypanthia and fruits, ovules rad...

A large-scale survey of the Central Arizona-Phoenix Long-Term Ecological Research study area was conducted in which many kinds of samples were collected (e.g., plant, insect, soil). The plant samples were of a smaller size than typical herbarium accessions due to limitations in personnel, storage space, available plant materials, and time. The vouc...

Essential oils of fragrant Mosiera ehrenbergii (O. Berg) Landrum (Myrtaceae), collected in Arizona from Mexican seed, and M. longipes (O. Berg) Small, collected in Florida, were examined by GC/MS/FID. Thirty-eight constituents were identified with dominant components of limonene (51.6±0.7%) and α-pinene (33.6±2.4%) in M. ehrenbergii and limonene (4...

Psidium cauliflorum, from the Brazilian state of Bahia, is described and illustrated. It differs from all other species of Psidium in having its flowers borne in clusters on older branches and trunks. It may belong to a complex of species including P. oligospermum, P. sartorianum, P. glaziovianum, P. schenckianum, and perhaps P. appendiculatum.

Essential oils of fragrant Mosiera enrhenbergii (O. Berg) Landrum (Myrtaceae), collected in Arizona from Mexican seed, and M. longipes (O. Berg) Small, collected in Florida, were examined by GC/MS/FID. Thirty-eight constituents were identified with dominant components of limonene (51.6±0.7%) and α-pinene (33.6±2.4%) in M. ehrenbergii and limonene (...

The Psidium grandifolium complex is revised with keys, descriptions, maps, and illustrations and is considered to consist of P. grandijolium, P. missionum, and P australe, the last with three varieties. The complex is mainly confined to eastern interior South America, ranging from Venezuela to Argentina. Lectotypes for the following taxa are chosen...

The essential oils of two collections Mojave Desert rue, Thamnosma montana Torr. & Frém., from Arizona were analyzed by GC and GC/MS. The oils were dominated by β-phellandrene (35.65 ± 3.37% to 42.58 ± 2.84%) and limonene (15.27 ± 1.45% to 21.91 ± 1.46%). Geijerene (0.18 ± 0.27% to 0.30 ± 0.47%) probably contributed to the rue-like fragrance associ...

The essential oil of desert-lavender, Hyptis emoryi Torrey, was subjected to analysis by GC and GC/MS. The oil was dominated by α-pinene (15.25±1.13%), ledene (15.09±3.81%) and limonene (11.14±1.19%).

Two new species of Myrtaceae are described and illustrated, Calycolpus aequatorialis of Ecuador and Psidium huanucoense of Peru. Calycolpus aequatorialis appears to have a close relative in C. surinamensis, but differs in having a closed calyx, relatively little indumentum, and strongly 4-winged twigs. Psidium huanucoense is compared with the simil...

A phylogeny based on the internal transcribed spacer (ITS) sequences from 79 taxa representing much of the diversity of Berberis L. (four major groups and 22 sections) was constructed for the first time. The phylogeny was basically congruent with the previous classification schemes at higher taxonomic levels, such as groups and subgroups. A notable...

The Annonaceae show a broader flower biological radiation than originally thought, with flowers being pollinated not only by beetles, but also by thrips, flies and even bees. The majority of species have hermaphroditic protogynous flowers. Species with white or yellowish‐white, small, delicate, day‐active flowers, may be pollinated either solely by...

The Psidium salutare complex is revised with keys, descriptions, maps, and illustrations and is considered to consist of P. laruotteanum (with no additional subspecific taxa) and P. salutare (with a total of five varieties). This complex ranges from eastern temperate South America to Mexico and Central America. The following taxa are lectotypified:...

The essential oil of the leaves and stems ofMyrcianthes coquimbensis collected in Chile and examined by GC/MS. Limonene (14.54±2.45%) was found to be the major component.

The essential oil obtained from the leaves and stems of Calyptranthes sintenisii collected in Puerto Rico was examined by GC/MS.The oil was dominated by neral (35.06±1.22%), geranial (18.72±0.69%), β-pinene(17.99±0.81%) and α-pinene (12.48±0.14%).

Campomanesia macrobracteolata andC. anemonea, apparently closely related species from Espírito Santo and Bahia, Brazil, are described as new and are illustrated. Comparisons are made with two other similar species.

Communicating Editor: Richard Jensen ''Phylogenetic reconstruction, currently the dominating focus of systematics, obviously is worth doing, but more scientifically important and far more urgent for human welfare is the description and mapping of the world biota.'' (E. O. Wilson, 2000). I agree wholeheartedly with Wilson's statement. The fascinatin...

The essential oil of the leaves and stems of Calycolpus australis, collected in Minas Gerais, Brazil and examined by GC/MS, is dominated by γ-terpinene (14.07±2.92%), terpinen-4-ol (13.11±1.03%), linalool (12.52±0.91%) and α-terpinene (11.53±1.93%).

Twenty species of Berberis are recognized in continental Chile, the Juan Fernandez Islands, and adjacent southern Argentina, comprising a considerable reduction in species number from the works of earlier authors. Hybridization between species is common. Each species is described, and all are distinguished with a dichotomous key. Maps are provided...

Calycolpus australis (Myrtaceae) of Minas Gerais, Brazil, is described as a new species. It is perhaps most similar to C. alternifolius but differs in various floral characters. This new species extends the range of the genus six degrees of latitude farther south.

A synoptic treatment of the 23 genera of Myrtaceae in Brazil and keys for their identification are provided, including a general key to all genera, a key to the subtribes, and keys to the genera of each subtribe. Four commonly recognized genera that we consider to be of uncertain status are provisionally treated as segregates of large related gener...

Psidium guajava andP. guineense are characterized, illustrated and contrasted. Population samples ofPsidium guajava andP. guineense and apparent hybrids were collected from four localities: two in Mexico, one in Honduras, and one in Argentina. Seven morphological characters, one micromorphological (stomatal density), and one chemical character (pre...

Samples of five species of the genus of Psidium (Myrtaceae) are analyzed for essential oils. The foliar oil of P. cattleianum Sabine is dominated by β-caryophyllene (59.92±1.70%). The foliar oil of P. friedrichsthalianum (Berg) Niedenzu is dominated by β-caryophyllene (36.82±19.44%) and α-pinene (10.61±13.70%). The foliar oil of P. guajava L. is do...

The foliar oil of Calycolpus warszewiczianus Berg (Myrtaceae) collected in Costa Rica is dominated by β-caryophyllene (30.12±1.20%).

The history and relationships of the mainly Caribbean genus Mosiera are discussed, and it is comprehensively described. Two Mexican and Mesoamerican species, Psidium contrerasii and P. ehrenbergii, are transferred to Mosiera.

Models of homoplastic evolution were constructed to test the accuracy of the parsimony criterion in estimating true tree length when homoplasy is relatively high. Models differed with respect to the following variables: 1) average steps per character-state change, 2) number of terminal taxa, 3) topology of trees, i.e., pectinate versus symmetric br...

The foliar oil of Blepharocalyx cruckshanksii (Hook. & Arn.) Niedenzu (Myrtaceae) collected in Chile is dominated by limonene (51.65±5.26% or 13.86+0.87%) and α-pinene (17.28±9.18% or 15.60±2.20%) with lesser amounts of spathulenol (7.57±5.30% or 11.42±0.60%). The foliar oil of B. salicifolius (Humb., Bonpl. & Kunth) Berg collected in Argentina is...

The absolute from the leaves of Amomyrtus meli (R. A. Phillippi) Legrand et Kausel (5902/5913) is dominated by 1-phenylpentan-3-one (1, 36/27%) and 1-phenylhexan-3-one (3, 32/53%). The absolute of Amomyrtus luma (Molina) Legrand et Kausel (5903/5920) is more complex, but it contains also 1 (4.6/8.5%) and 3 (3.5/12.3%) as well as β-caryophyllene oxi...

The foliar oils of Pimenta obscura Proctor of Jamaica, which were examined by GC/MS, were found to be rich in either 1,8-cineole (16.84–25.11%), limonene (5.31–11.48%) and p-cymene (10.97–11.33%) with lesser amounts of terpinen-4-ol (4.92–9.80%) and α-phellandrene (2.59–6.33%), or ledol (13.47%) and palustrol (7.64%).

The foliar oils of Pimenta jamaicensis (Britton & Harris) Proctor of Jamaica, which were analyzed by GC/MS, were found to possess oils which were dominated by either eugenol (61.79%) and limonene (10.33%) with a lesser amount of β-caryophyllene (5.77%), or 1,8-cineole (43.94–49.43%), α-terpineol (0.34–18.02%) and p-cymene (2.25–10.25%) with a lesse...

The foliar oils of Pimenta haitiensis (Urban) Landrum of the Dominican Republic, which were analyzed by GC/MS, were found to contain 1, 8-cineole (11.35–33.14%), methyl chavicol (11.65–41.10%), linalool (15.97–17.81%), and/or methyl eugenol (0–24.39%) as major constituents.

The foliar essential oils of Pimenta racemosa (Miller) J. Moore var. grisea (Kiaerskov) Fosb. are dominated by geraniol (0–85.52%), methyl eugenol (0.30–92.60%), and/or trans-methyl isoeugenol (0–86.32%). The foliar essential oils of Pimenta racemosa var. hispaniolensis (Urban) Landrum are dominated by 1,8-cineole (0.05–37.96%), methyl chavicol (0–...

The following new combinations are made:Myrteola phylicoides (Benth.) Landrum,Myrteola phylicoides var.glabrata (Berg) Landrum,Myrceugenia alpigena var.fuliginea (Berg) Landrum,Myrceugenia ovata var.regnelliana (Berg) Landrum, andMyrceugenia pilotantha var.nothorufa (Legrand) Landrum.

Two oils produced by steam distillation of the leaves of Pimenta dioica (L.) Merr. of Jamaican origin were examined by GC/MS and found to be rich in eugenol (66.38–79.24%).