Latest Articles from PhytoKeys Latest 5 Articles from PhytoKeys https://phytokeys.pensoft.net/ Thu, 28 Mar 2024 11:48:29 +0200 Pensoft FeedCreator https://phytokeys.pensoft.net/i/logo.jpg Latest Articles from PhytoKeys https://phytokeys.pensoft.net/ Resurrection of Leucobryum scalare Müll.Hal. ex M.Fleisch. (Bryophyta, Leucobryaceae) based on phylogenetic and morphometric evidence https://phytokeys.pensoft.net/article/98990/ PhytoKeys 222: 27-47

DOI: 10.3897/phytokeys.222.98990

Authors: Patsakorn Tiwutanon, Kasidis Chaiyasut, H. Thorsten Lumbsch, Ekaphan Kraichak

Abstract: Leucobryum scalare was described in 1904 but its taxonomic status has been disputed, being reduced to a variety of Leucobryum aduncum or synonymized with Leucobryum aduncum. The taxonomic confusion of this taxon has remained unresolved. Hence, we revisited the taxonomic status of the taxon using phylogenetic and morphometric approaches. A total of 27 samples from Leucobryum aduncum var. aduncum and Leucobryum aduncum var. scalare were used to generate data from four markers, including ITS1, ITS2, atpB-rbcL spacer, and trnL-trnF. The concatenated dataset was used to reconstruct a phylogenetic tree. Both qualitative and quantitative morphological characters were measured and analyzed with Principal Component Analysis (PCA) and PERMANOVA. The results showed that the two taxa are closely related but they are reciprocally monophyletic. Both qualitative and quantitative characters could also separate Leucobryum aduncum var. scalare from Leucobryum aduncum var. aduncum as shown with PCA and PERMANOVA. We propose the resurrection of the species rank for Leucobryum scalare as separate from Leucobryum aduncum. This work highlights the need for a more thorough revision of Leucobryum to clarify the actual level of diversity in this genus.

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Research Article Mon, 20 Mar 2023 12:40:20 +0200
A comprehensive checklist of the deciduous photinia genus Pourthiaea (Maleae, Rosaceae), with emphasis on their validity and typification https://phytokeys.pensoft.net/article/85822/ PhytoKeys 202: 1-33

DOI: 10.3897/phytokeys.202.85822

Authors: Yi-Lei Lou, Ze-Tao Jin, Dai-Kun Ma, Bin-Bin Liu

Abstract: Due to the complicated evolutionary history in Pourthiaea, ninety-seven taxa have been described since 1784, and ninety-one of them are validly published taxa, five are naked names, and one is an invalid name. After a comprehensive and critical evaluation, 213 names have been published, including new combinations, new status, and new names; this may be due to the controversial taxonomic position of Pourthiaea in the apple tribe, Maleae. We herewith provide a taxonomic checklist of Pourthiaea for further taxonomic and evolutionary studies. We also lectotypify two taxa: Photinia amphidoxa var. stylosa and P. glabra var. fokienensis.

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Checklist Tue, 19 Jul 2022 15:25:46 +0300
Discovery of the first succulent bamboo (Poaceae, Bambusoideae) in a new genus from Laos’ karst areas, with a unique adaptation to seasonal drought https://phytokeys.pensoft.net/article/51636/ PhytoKeys 156: 125-137

DOI: 10.3897/phytokeys.156.51636

Authors: Thomas Haevermans, Dulce Mantuano, Meng-Yuan Zhou, Vichith Lamxay, Agathe Haevermans, Patrick Blanc, De-Zhu Li

Abstract: Lush jungle flagship species, woody bamboos (Poaceae–Bambusoideae) are famed for their synchronous flowering as well as the extensive “bamboo forests” some species can form in tropical or temperate environments. In portions of their natural distribution, Bambusoideae members developed various adaptations to seasonality in environmental parameters, such as frost or seasonal drought. A new taxon, Laobambos calcareus, described here, is extremely novel in showing the first documented case of succulence in bamboos, with its ability to seasonally vary the volume of its stem depending on the quantity of water stored. Anatomical studies presented in this paper document this specificity at the cellular level. Though no flowers or fruits are known yet, unique morphological characteristics along with an investigation of its phylogenetic affinities using molecular data show that this new taxon should belong to a new genus herein described.

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Research Article Fri, 21 Aug 2020 15:06:38 +0300
A new species and two new records of Goniothalamus (Annonaceae) from Lao PDR https://phytokeys.pensoft.net/article/38995/ PhytoKeys 138: 17-25

DOI: 10.3897/phytokeys.138.38995

Authors: Bin Yang, Ren-Bin Zhu, Hong-Bo Ding, Somsanith Bouamanivong, Yun-Hong Tan

Abstract: Goniothalamus saccopetaloides Y.H. Tan & Bin Yang, a new species is described and illustrated from Laos. This species shows morphological similarities to G. yunnanensis W.T. Wang, but it differs from the latter by having almost fleshy, involute and saccate outer petals, subglobose monocarps, and single seeded monocarps. Goniothalamus cheliensis, and G. calvicarpus are new records for the Flora of Lao PDR. A key to Goniothalamus species indigenous to Laos is provided here.

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Research Article Fri, 10 Jan 2020 14:29:03 +0200
An updated checklist of Begonia (Begoniaceae) in Laos, with two new species and five new records https://phytokeys.pensoft.net/article/46718/ PhytoKeys 138: 187-201

DOI: 10.3897/phytokeys.138.46718

Authors: Hong-Bo Ding, Mya Bhone Maw, Bin Yang, Somsanith Bouamanivong, Yun-Hong Tan

Abstract: Two new species of Begonia L. (Begoniaceae), B. laotica (sect. Parvibegonia) and B. hypoleuca (sect. Reichenheimia), from north Laos are described and illustrated. Begonia augustinei, B. dryadis, B. lancangensis, B. sizemoreae and B. sillentensis subsp. mengyangensis were newly recorded taxa in Laos. Furthermore, an updated checklist of Begonia of Laos is also compiled.

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Research Article Fri, 10 Jan 2020 11:17:31 +0200