Latest Articles from PhytoKeys Latest 5 Articles from PhytoKeys https://phytokeys.pensoft.net/ Thu, 28 Mar 2024 18:40:03 +0200 Pensoft FeedCreator https://phytokeys.pensoft.net/i/logo.jpg Latest Articles from PhytoKeys https://phytokeys.pensoft.net/ New combinations and updated descriptions in Podagrostis (Agrostidinae, Poaceae) from the Neotropics and Mexico https://phytokeys.pensoft.net/article/50042/ PhytoKeys 148: 21-50

DOI: 10.3897/phytokeys.148.50042

Authors: Steven P. Sylvester, Paul M. Peterson, Konstantin Romaschenko, William J. Bravo-Pedraza, Lia E. Cuta-Alarcon, Robert J. Soreng

Abstract: Based on morphological study and corroborated by unpublished molecular phylogenetic analyses, five grass species of high-mountain grasslands in Mexico, Central and South America, Agrostis bacillata, A. exserta, A. liebmannii, A. rosei, and A. trichodes, are transferred to Podagrostis and bring the number of species of this genus recognized in the New World to ten. The name Apera liebmannii is lectotypified and epitypified. We provide an updated genus description for Podagrostis, and updated species descriptions, images, and notes on the new combinations. The diagnostic characteristics differentiating Podagrostis from Agrostis are: a) palea that reaches from (2/3) ¾ to almost the apex of the lemma; b) florets that usually almost equal the length of the glumes or are at least ¾ the length of the glumes; c) rachilla extension present and emerging from under the base of the palea as a slender short stub (rudimentary or up to 1.4 mm long, sometimes obscure in most florets in P. rosei), smooth or scaberulous, glabrous or distally pilulose (hairs < 0.3 mm long); d) lemmas usually awnless, sometimes with a short straight awn 0.2–0.6 mm long, inserted medially or in the upper 1/3 of the lemma, not surpassing the glumes (awn well-developed, straight or geniculate and inserted in lower 1/3 of lemma, not or briefly surpassing glumes in P. rosei). We include a generic key to distinguish the species of Podagrostis from other similar genera in Latin America and a key to distinguish the species of Podagrostis now accepted as occurring in these areas.

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Research Article Tue, 26 May 2020 10:20:10 +0300
Two new combinations, lectotypifications and a new name for Costa Rican Palicourea s.l. https://phytokeys.pensoft.net/article/13330/ PhytoKeys 80: 53-63

DOI: 10.3897/phytokeys.80.13330

Authors: Andreas Berger

Abstract: Species of the complex and diverse genera Psychotria and Palicourea are common but little-known elements in many tropical forest ecosystems. DNA-phylogenetic studies and a re-evaluation of morphological characters have recently shown that species of Psychotria subg. Heteropsychotria are nested within Palicourea s.l., which was traditionally separated by exhibiting a bird-pollinated (vs. insect-pollinated) pollination syndrome. In order to render both genera monophyletic groups, species of subg. Heteropsychotria need to be transferred to Palicourea s.l. For Central American species, most of the necessary combinations have already been made. In the course of ongoing research on the phytochemical characterization of species and clades of Costa Rican Palicourea s.l., the nomenclature of Mesoamerican species was revised. As a result, two new combinations and a new name are proposed here: Palicourea horquetensis (Dwyer & Hayden) A. C. Berger & C. M. Taylor is based on Rudgea horquetensis Dwyer & Hayden, Palicourea tonduzii (K. Krause) A. C. Berger is based on Cephaelis tonduzii K. Kraus and Palicourea longiinvolucrata A. C. Berger replaces Psychotria hispidula Standl. In addition, two lectotypes are designated.

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Research Article Fri, 19 May 2017 16:13:28 +0300
Problematic specimens turn out to be two undescribed species of Bignonia (Bignoniaceae) https://phytokeys.pensoft.net/article/5423/ PhytoKeys 56: 7-18

DOI: 10.3897/phytokeys.56.5423

Authors: Alexandre R. Zuntini, Charlotte M. Taylor, Lúcia G. Lohmann

Abstract: Bignonia comprises 29 species of lianas characterized by eight phloem wedges, leaves usually 2-foliolate, mostly simple tendrils and opaque seed wings. The analysis of herbarium specimens in preparation for a taxonomic revision of the genus led to the recognition of two new species: (i) Bignonia cararensis from Costa Rica, characterized by a thyrse with lateral compound dichasia and lack of interpetiolar ridge, and (ii) Bignonia sanctae-crucis from Bolivia and Brazil, distinguishable by its membranous leaflets, membranous calyx and small fruits. We provide detailed descriptions, illustrations, distribution maps, initial conservation status assessments, and comparisons of the newly described taxa with closely related species.

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Research Article Thu, 3 Sep 2015 10:03:29 +0300
A synopsis of the New World species of Drypetes section Drypetes (Putranjivaceae) with asymmetrical fruits, including description of a new species https://phytokeys.pensoft.net/article/1492/ PhytoKeys 29: 75-87

DOI: 10.3897/phytokeys.29.6004

Authors: Geoffrey Levin

Abstract: A synopsis of the New World species of Drypetes (Putranjivaceae) with asymmetrical drupes is presented. The group consists of three species: D. alba, with two varieties, from the West Indies, D. gentryi from Mexico, and the newly described D. asymmetricarpa from Costa Rica. The new species can be distinguished from both its relatives by its longer fruiting pedicels. In addition, the new species differs from D.alba by its larger fruits, and from D. gentryi byshorter staminate pedicels and stigmas borne on styles (rather than sessile). Lectotypes are designated for D. alba var. latifolia and D. incurva.

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Research Article Fri, 22 Nov 2013 00:00:00 +0200
Eight new species of Cestrum (Solanaceae) from Mesoamerica https://phytokeys.pensoft.net/article/1402/ PhytoKeys 8: 49-82

DOI: 10.3897/phytokeys.8.2238

Authors: Alex Monro

Abstract: As part of the preparation of a taxonomic revision of Cestrum (Solanaceae) for Flora Mesoamericana eight hitherto undescribed species from Mexico, Guatemala, Costa Rica and Panama were identified. These eight new species are described and illustrated. Affinities of the species are discussed and Global Species Conservation Assessments presented. The new species are Cestrum amistadense A.K. Monro, sp. nov. (Vulnerable) which most closely resembles Cestrum longiflorum Ruiz & Pav., Cestrum contrerasianum A.K. Monro, sp. nov. (Vulnerable) which most closely resembles Cestrum formosum C.V.Morton, Cestrum darienense A.K. Monro, sp. nov. (Near Threatened) which most closely resembles Cestrum morae Hunz., Cestrum gilliae A.K. Monro, sp. nov. (Near Threatened) which most closely resembles Cestrum morae, Cestrum haberii A.K. Monro, sp. nov. (Vulnerable) which most closely resembles Cestrum poasanum Donn.Sm., Cestrum knappiae A.K. Monro, sp. nov. (Near Threatened) which most closely resembles Cestrum acuminatum Francey, Cestrum lentii A.K. Monro, sp. nov. (Near Threatened) which most closely resembles Cestrum johnniegentrianum D’Arcy and Cestrum talamancaense A.K. Monro (Least Concern) which most closely resembles Cestrum laxum Benth.

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Research Article Wed, 4 Jan 2012 00:00:00 +0200