Laurence J. Dorr's research while affiliated with Smithsonian Institution and other places
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Publications (137)
Species identification is fundamental to all aspects of biology and conservation. The process can be challenging, particularly in groups including many closely related or similar species. The problem is confounded by the absence of an up-to-date taxonomic revision, but even with such a resource all but professional botanists may struggle to recogni...
![Neotype of Eleutherostylis renistipulata Burret (US [01210662]).](publication/377542100/figure/fig2/AS:11431281222169599@1707141847744/Neotype-of-Eleutherostylis-renistipulata-Burret-US-01210662_Q320.jpg)
Morphological and molecular phylogenetic evidence indicate that Eleutherostylis Burret (Malvaceae, Grewioideae), a monotypic genus described from New Guinea, is best considered a synonym of Grewia L., a species-rich genus widespread across the Paleotropics and found in Africa, Arabia, Asia, Australia and the western Pacific. A new combination, base...
Species identification is fundamental to all aspects of biology and conservation. The process can be challenging, particularly in groups including many closely related or similar species. The problem is confounded by the absence of an up-to-date taxonomic revision, but even with such a resource all but professional botanists may struggle to recogni...
Se describe e ilustra Ouratea chepelii, a la presente conocida en los Andes venezolanos. Se discute su distribución geográfica y datos ecológicos para el género Ouratea en los Andes de Venezuela. Ouratea chepelii parece estar relacionada con O. larae por su distribución fitogeográfica ya que ambas están restringidas a los Andes venezolanos. La prim...
Types are designated for the names of three species of Byttnerioideae (Malvaceae) described by Linnaeus. These include lectotypes for the names Hermannia triphylla and Melochia supina (= M. corchorifolia ), and a neotype for the name Theobroma augustum (≡ Abroma augustum ). Two of the type designations are illustrations and one is a specimen. The i...
Dendrophthora kuijtiana (Santalaceae), a new species of mistletoe endemic to the páramos and subpáramos of the Venezuelan Andes, is described and illustrated. We discuss aspects of its ecology, and taxonomic affinities with Dendrophthora davidsei. In addition, we report a new record (D. paucifolia) and two updates (D. karuaiana y D. warmingii) to D...
Types are designated for the names of four species of Malvoideae (Malvaceae); three described by Linnaeus and one by Jacquin. The names of the three species described by Linnaeus are typified by lectotypes (Alcea ficifolia, Hibiscus aethiopica) and a neotype (H. surattensis). A fourth Linnaean name, Sida triquetra, is an illegitimate superfluous na...
Types are designated for the names of two species of Helicteres (Malvaceae: Helicteroideae) described by Linnaeus. A lectotype is designated for H. angustifolia and a neotype for H. pentandra.
Hibiscus marioniae Dorr, sp. nov. is described and illustrated. It evidently is restricted to central Guyana, northeast of the Kanuku Mountains near the Rewa River, a tributary of the Rupununi River. The new species is most similar morphologically to H. amazonicus Fryxell, which was described from Amazonas, Brazil.
Types are designated for five species of Grewioideae (Malvaceae) described by Linnaeus. These include three lectotypes and one neotype of names of Corchorus species and one lectotype of the name of a Triumfetta species. Three of the lectotypes are illustrations and one is a specimen in Linnaeus's herbarium. In addition, an epitype for T. lappula is...
Familiar lessons in Botany with flora of Texas (1873) by M.J. Young was analyzed to establish how many nomenclatural novelties it contains. The flora portion of the book, written with the assistance of S.B. Buckley, borrowed almost all its descriptions, often verbatim, from earlier floras. Despite extensive copying, Young described two and Buckley...
A nomenclatural conspectus is presented for the species of Waltheria (Malvaceae: Byttnerioideae) that occur in Brazil. Synonymies for 33 species, 23 endemic, are presented. Seven names are newly synonymized. In addition, eight excluded or unresolved names are discussed. Thirty-nine lectotypes are designated for Waltheria names, one neotype is desig...
The typification and status of the names of 14 species of Pachira (Malvaceae: Bombacoideae) found in Brazil are discussed, including type material from Brazil, the Guianas, Colombia, Venezuela, and cultivated in Algeria. We designate 11 lectotypes, three neotypes, and four epitypes for these names. Six names are newly considered to be synonyms of t...
Bombax cearense, endemic to Brazil, is transferred to Pachira and the name is lectotypified. The basionyms of two other species of Pachira endemic to Brazil also are lectotypified.
A new species of Eriotheca (Malvaceae, Bombacoideae) from coastal areas in the northeastern Brazilian states of Alagoas and Bahia is described and illustrated. Eriotheca alversonii inhabits Atlantic coastal forest and is found principally on sandy soils in restinga vegetation. It is most similar morphologically to E. parvifolia. Both species have 3...
Molecular phylogenetic analyses of Malvaceae subfamily Dombeyoideae based on a 6‐marker dataset sampling all 21 currently accepted genera (including extinct Astyria) yielded improved resolution and evidence for multiple generic circumscription problems. The taxonomy of the subfamily is adjusted with the synonymization of 10 genera (eight in current...
Foto del hábito e inflorescencia de Harperocallis robustior en su hábitat natural a 3000 msnm, Páramo El Pumar. estado Trujillo, Venezuela.
A new species of Puya Molina (Bromeliaceae) from the Venezuelan Andes, P.
guaramacalana Stergios, Caracas, Dorr & S.M. Niño, is described and illustrated.
Mor phologically this new species belongs in Puya subgenus Puyopsis (Baker)
L.B.Sm. where it most closely resembles two other species with simple peduncles
and nutant inflorescences, P. nutans L....
Two new species of Dendrophthora Eichler (Viscaceae) from northwestern Venezuela are described and illustrated. Both mistletoes, D. apiculata Canelón et al., sp. nov. and D. coronata Canelón et al., sp. nov. , are confined to subpáramo and páramo ecosystems of the Venezuelan Andes and are, at present, only known from Guaramacal National Park (Portu...
Hedyosmum guaramacalense, found in montane forest (1600–2600 m) on the south slope of Guaramacal National Park, Trujillo state, Venezuela, is described and illustrated. The new species belongs to H. subgenus Tafalla section Microcarpa and is similar to H. goudotianum var. goudotianum, but can be distinguished by its elliptic or narrowly elliptic, c...
Carex elata All. is a well-known species widely distributed in western Eurasia. The name C. elata All. is the oldest name applied to the species of concern, but it was abandoned for C. stricta Gooden soon after publication. At the end of the 19th century and the beginning of the 20th century, different authors dismissed C. stricta Gooden. as a late...
With digitized herbarium specimens and associated metadata accumulating rapidly in open access repositories, we are now able to exploit data-hungry computer vision techniques in order to evaluate fundamental questions in plant evolution. High among the list of unknowns is the role that ecological factors, such as morphological similarity, play in m...
William and Mary (née Crage) Pool spent the decade from 1865 to 1875 in Madagascar as missionaries employed by the London Missionary Society. For amusement, Mrs Pool collected lichen and plant specimens, which her husband eventually donated to Kew. Even though Mrs Pool collected most of these specimens, her husband invariably receives credit: his n...
Carex phleoides Cav. is the largest species of the former genus Uncinia Pers. It is widely distributed in the Neotropics and is also known from the Juan Fernández archipelago off the coast of Chile. A second taxon, U. trichocarpa C. A. Mey., is often considered a synonym of C. phleoides, but also sometimes a variety of that species or even a distin...
Eriolaenarulkensii Dorr, sp. nov . is described and illustrated. This attractive shrub is endemic to coastal Mozambique. The new species has apically winged seeds, which place it in a group of Malvaceae (Dombeyoideae) that is found in Asia and Madagascar and which had not previously been found in continental Africa.
Andeimalvaperuviana Dorr & C.Romero, sp. nov. , the third Peruvian endemic in a small genus of five species, is described and illustrated from a single collection made at high elevation on the eastern slopes of the Andes. Molecular phylogenetic analyses of nuclear ribosomal ITS sequence data resolve a group of northern species of Andeimalva found i...
Proposal to conserve the name Grewia tiliifolia against G. damine (Malvaceae: Grewioideae)
Proposal to conserve the name Grewia asiatica (Malvaceae: Grewioideae) with a conserved type
The genus Valliera is reduced to synonymy under Neosprucea. Its sole species, V. triplinervis, is considered to be conspecific with N. grandiflora. A lectotype is designated for the former species name. ©2018 Botanical Research Institute of Texas.All Rights Reserved.
Two new species of Piper are described and illustrated. Piper sotobosquense and P. calvarii, currently considered endemic to Venezuela, are found only on the slopes and montane forests of Guaramacal National Park, Portuguesa and Trujillo states, Venezuela. Taxonomic relationships also are discussed and comments on distribution and ecology are prese...
Natural history collections contain data that are critical for many scientific endeavors. Recent efforts in mass digitization are generating large datasets from these collections that can provide unprecedented insight. Here, we present examples of how deep convolutional neural networks can be applied in analyses of imaged herbarium specimens. We fi...
Annotated notebook used to define and train the unstained/stained CNN.
Annotated notebook used to define and train the clubmoss/spikemoss CNN
Notebook used to define and train the clubmoss/spikemoss CNN.
Notebook used to define and train the unstained/stained CNN.
Taxonomic notes in the Neotropical genus Pseudobombax (Malvaceae) are presented. One new combination and two new heterotypic synonyms for taxa originally described from Brazil and Ecuador are proposed based on both morphological and previously published molecular evidence. The taxonomic changes will be adopted in a treatment of Pseudobombax for the...
Two innovations in the nomenclature of Mexican Malvaceae are proposed. First, Ayenia sidifolia is reestablished as the correct name for the species currently known as A. mexicana: this latter name was incorrectly proposed as a replacement name in Ayenia for Cybiostigma sidifolium. Second, the monotypic genus Veeresia endemic to Mexico is placed in...
Albert Mocquerys, a commercial collector of natural history specimens, visited Venezuela from September 1893 through May 1894 and collected a wide range of organisms; plants, birds, insects, fishes, mammals, and fossil shells. Walter Rothschild evidently was his principal zoological patron and Emmanuel Drake del Castillo his botanical one. In Venez...
Systematic biology is a discipline rooted in collections. These collections play important roles in research and conservation and are integral to our efforts to educate society about biodiversity and conservation. Collections provide an invaluable record of the distribution of organisms throughout the world and through recent and geological time, a...
The name Sterculia laxiflora Rusby (Malvaceae: Sterculioideae) is based on a mixture of
more than one taxon: a several-flowered inflorescence of Erythropsis pallens (Wall. ex King) Ridl.
(Malvaceae: Sterculioideae) and bark and leaves of Pachira aquatica Aubl. (Malvaceae:
Bombacoideae). The several-flowered inflorescence that forms part of one of t...
In Hindi the word ghat signifies a wide series of steps leading down to a river, especially one used for bathing. The ghats or steps most familiar to non-Indians are those on the Ganges that are used to descend to this sacred river for bathing, religious rituals, and cremations. The same word is used to describe a pass or steps through the mountain...
A new species of Puya Molina (Bromeliaceae) from the Venezuelan Andes, P. guaramacalana Stergios, Caracas, Dorr & S.M. Niño, is described and illustrated. Mor phologically this new species belongs in Puya subgenus Puyopsis (Baker) L.B.Sm. where it most closely resembles two other species with simple peduncles and nutant inflorescences, P. nutans L....
A combination in Eriolaena DC. based on Microchlaena quinquelocularis Wight & Arn. has been attributed erroneously to at least three different authors, but it is established here that a fourth author heretofore overlooked, Heber Drury, validly published the combination
in 1864. A lectotype is selected for M. quinquelocularis.
Four new species of Pilea (Urticaceae) from the Andes of Venezuela are described and illustrated: Pilea
matthewii
sp. nov., Pilea
miguelii
sp. nov., Pilea
nicholasii
sp. nov., and Pilea
nidiae
sp. nov. The affinities of these species and their positions within the informal classifications of Pilea proposed by Weddell and Killip are discussed. Notes...
To facilitate an ongoing taxonomic revision of Pseudobombax
Dugand as part of studies on the systematics of Neotropical
Bombacoideae (Malvaceae), we clarify the typification of 16
names in Bombacoideae that were published by Emil Hassler
and Robert Chodat based mostly on specimens collected by
Hassler in Paraguay and collected by Robert Fries and G...
Se describen las especies de Burmanniaceae presentes en el parque Nacional Guaramacal
Se describen las palmas del Parque Nacional Guaramacal en el estado Trujillo, Venezuela.
Se describen las especies de Commelinaceae presentes en el Parque Nacional Guaramacal, Venezuela.
Se describe las especies de Eriocaulaceae presentes en el Parque Nacional Guaramacal, Venezuela.
Se describen las Heliconias del Parque Nacional Guaramacal
Se describe y elaboran claves para identificar las Poaceae del Parque Nacional Guaramacal, entre altitudes de 1600 a 3150 msnm, en el estado Trujillo, Venezuela.
Se dscribe Juncaceae del Parque Nacional Guaramacal, Andes, Venezuela.
Se describe Tofieldiaceae del parque Nacional Guaramacal en Venezuela.
Se describen las especies de palmas (Arecaceae) presentes en el Parque Nacional Guaramacal, ubicado en el estado Trujillo, Venezuela.
Se describe Cannaceae del Parque Nacional Guaramacal, estado Trujuillo, Venezuela.
In order to better understand the taxonomy of the enigmatic Pseudobombax endecaphyllum (Vell.) A.Robyns
(Malvaceae: Bombacoideae), the only species in this genus thought to have aculeate branches, we reexamined the protologues of B. endecaphyllum and Pachira decaphylla A.St.-Hil. & Naudin, the latter a name long considered to be a synonym of the fo...
Ten new combinations from Asagraea, Isidrogaliva, and Tofieldia are proposed in the previously monospecific genus Harperocallis (Tofieldiaceae, Alismatales). As circumscribed here, the genus is restricted to the Americas. The majority of species occur in the Andes or the Guayana region of northern South America; more than half have restricted distr...
Monographs are fundamental for progress in systematic botany. They are the vehicles for circumscribing and naming taxa, determining distributions and ecology, assessing relationships for formal classification, and interpreting long–term and short–term dimensions of the evolutionary process. Despite their importance, fewer monographs are now being p...
Monographs are fundamental for progress in systematic botany. They are the vehicles for circumscribing and naming taxa, determining distributions and ecology, assessing relationships for formal classification, and interpreting long-term and short-term dimensions of the evolutionary process. Despite their importance, fewer monographs are now being p...
Apeiba trombetensis is described from northern Brazil, illustrated, and distinguished from related species. It is remarkable for its tetramerous calyx, sepal pubescence, and its large, globose capsules with stout spines.
Stauffer, F. W., J. Stauffer & L. J. Dorr (2012). Bonpland and Humboldt specimens, field notes, and herbaria; new insights from a study of the monocotyledons collected in Venezuela. Candollea 67: 75–130. In English, English and French abstracts. The monocotyledon collections emanating from Humboldt and Bonpland's expedition are used to trace the co...
The correct name in Diospyros L. (Ebenaceae) for a species from Tonga first described as Maba elliptica J. R. Forst. & G. Forst. and incorrectly known as D. elliptica (J. R. Forst. & G. Forst.) P. S. Green is D. foliosa (A. Gray) Bakh. In addition to the nominate variety, six additional varieties are recognised from Fiji and Samoa. As these varieti...
The unispecific Fijian genus Pimia Seem. (Sterculiaceae) has long been considered to be related to genera that are now included in the Byttneriaceae (also known as Malvaceae-Byttnerioideae). Morphological characters, however, indicate that Pimia is a mixture of Commersonia J. R. Forst. & G. Forst. (Byttneriaceae) and Diospyros L. (Ebenaceae). The n...
Nesogordonia tricarpellata Skema & Dorr, sp. nov., a new species from southeastern Madagascar, is described and illustrated. It differs from all other species of Nesogordonia Baill. in having 6-9 stamens, 3 staminodes, a 3-carpellate ovary, and a 3-valved capsule. These androecial and gynoecial characters require modification of the long-standing c...
The correct name for the Cuban species of Trichospermum Bl. (Malvaceae: Grewioideae) also found in Mexico and Central America is Trichospermum lessertianum (Hochr.) Dorr, comb. n. The name Trichospermum mexicanum (DC.) Baill., incorrectly applied to this Cuban species, should be restricted to a species endemic to western and southern Mexico.
Neotypes are proposed for the names of ten species of American plants that Linnaeus based in whole or in part on descriptions in Loefling's Iter Hispanicum: Allionia incarnata, Allionia violacea, Ayenia tomentosa, Byttneria scabra, Krameria ixine, Lecythis ollaria, Moniera trifolia, Viola arborea, Viola calceolaria, and Viola oppositifolia. Lectoty...
Neotypes are proposed for the names of ten species of American plants that Linnaeus based in whole or in part on descriptions in Loefling's Iter Hispanicum: Allionia incarnata, Allionia violacea, Ayenia tomentosa, Byttneria scabra, Krameria ixine, Lecythis ollaria, Moniera trifolia, Viola arborea, Viola calceolaria, and Viola oppositifolia. Lectoty...
The natural history expedition of the American banker and stock broker Francis E. Bond and companions to the Paria Peninsula and delta of the Orinoco, Venezuela, in early 1911 is described. Biographical details are provided for the three principles: Francis E. Bond, Stewardson Brown and Thomas S. Gillin. The itinerary of their three and a half mont...
Citations
... With approx. 692 species, Erica is the largest CFR genus (Oliver and Forshaw, 2012) and often a dominant element of the vegetation. Floral variation in Erica is extensive and includes floral types that suggest pollination by birds and insects, specifically long-tongued flies, as well as by wind . ...
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... Taxon and molecular sampling: We generated new data from 81 new field-collected, silica-dried leaf samples and additional data from 79 previously analysed samples, expanding existing datasets to include a total of 730 accessions representing 551 Erica species (587 specific and subspecific taxa) and 6 outgroup taxa (4 species). This represents 65% of 851 currently recognised (non-hybrid) species (Elliot et al., 2024) following the taxonomic concepts of E.G.H. Oliver (Oliver et al. 2024). In summarising known threat status and taxonomic data for use in the EDGE analyses (see below), we compiled an extended list of 1048 species, subspecies, and varieties (Appendix 1). ...
... In the states of Alagoas and Pernambuco, where W. marielleae In Brazil, W. rotundifolia occurs only in the northeastern region, in all states. Saunders and Dorr (2022) point out the occurrence of this species in the states of Minas Gerais and Rio de Janeiro, however, after an intense study of the botanical collections in Brazil and abroad, no specimen was found so that this data could not be validated. This species primarily inhabits caatinga vegetation, but in the state of Rio Grande do Norte, it was observed growing in restinga vegetation (savannalike formation with beach sands deposited during the Quaternary, in areas above sea level that support scattered clumps of small trees, shrubs, herbs, and grasses (Thomas and Barbosa 2008)), an environment where W. marielleae has not been recorded. ...
... Several nomenclatural novelties were published recently for the genus Pachira Aubl., including lectotypifications, designations of epitypes, descriptions of new species and combinations (Andino & Fernández-Alonso 2018;Carvalho-Sobrinho & Dorr 2020;Carvalho-Sobrinho et al. 2021;Yoshikawa et al. 2022). ...
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... infrageneric classification according to various authors.Since Jacob de Cordemoy's (1895), this section was segregated from other sections by its distinctive inflorescence architecture organised in biparous scorpioid cymes. Molecular studies(Le Pechon et al. 2010;Skema 2012;Dorr and Wurdack 2021) have partially clarified some taxonomic uncertainties. For example, Skema (2012) transferred the morphologically distinctive species of subsection Rigidae Arènes to the genus Helmiopsis. ...
... Several nomenclatural novelties were published recently for the genus Pachira Aubl., including lectotypifications, designations of epitypes, descriptions of new species and combinations (Andino & Fernández-Alonso 2018;Carvalho-Sobrinho & Dorr 2020;Carvalho-Sobrinho et al. 2021;Yoshikawa et al. 2022). ...
... Prior to this publication, the genus comprised ca. 27 species, of which 20 (22 with this publication) are in Brazil and seven occur in cerrado vegetation (Robyns 1963;Carvalho-Sobrinho et al. 2020;Duarte & Yoshikawa 2020). ...
... Dendrophthora Eichler es un género neotropical, distribuido desde el sur de México hasta Bolivia, incluso el Caribe (Kuijt 1961;Kuijt & Hansen 2015;Canelón & al. 2020), con unas 129 especies hemiparásitas aéreas conocidas como muérdagos. En Cuba, León & Alain (1951) reconocen 34 especies de las que 20 son endemismos. ...
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... Image processing in combination with artificial intelligence methods has been proposed to address different issues of natural history digitization projects, such as: identification of nomenclatural type specimens [33], morphological analysis [11,37], specimen identification [6,13], identification of the elements present in a specimen image [35,36], automated information extraction [16], phenological research [38] and phenotype studies [19,30]. Some methods are specifically designed to take advantage of the large quantities of image Fig. 1a, from NHM Data Portal [22]. ...
... Therefore, names can be imported into an electronic taxonomic working tool so that the actual taxonomic research can focus on checking validity of names and testing taxon concepts at species level. At the same time, the taxonomic workflows are revolutionised by structured data (Kilian et al. 2015) and evolutionary approaches to investigate species limits (Stuessy and Lack 2011; Marhold et al. 2013). ...
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