Latest Articles from PhytoKeys Latest 4 Articles from PhytoKeys https://phytokeys.pensoft.net/ Thu, 28 Mar 2024 11:04:04 +0200 Pensoft FeedCreator https://phytokeys.pensoft.net/i/logo.jpg Latest Articles from PhytoKeys https://phytokeys.pensoft.net/ Taxonomic Identity of Carpinus dayongina Franchet (Betulaceae) https://phytokeys.pensoft.net/article/57725/ PhytoKeys 177: 63-75

DOI: 10.3897/phytokeys.177.57725

Authors: Qianqian He, Runan Zhao, Anguo He, Zunling Zhu, Yihua Tong

Abstract: Carpinus polyneura and C. dayongina are recognised as separate species in Flora of China. In this study, the results of an examination of literature, morphological comparison and phenetic clustering of nuclear ITS sequences suggest that C. dayongina is conspecific with C. polyneura. Thus, we propose reducing C. dayongina to a synonym of C. polyneura.

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Research Article Wed, 12 May 2021 09:37:40 +0300
Merger of Betula tatewakiana (Betulaceae) from northern Japan with northeast Asian B. ovalifolia based on ploidy level https://phytokeys.pensoft.net/article/58585/ PhytoKeys 170: 83-91

DOI: 10.3897/phytokeys.170.58585

Authors: Yuki Shiotani, Tomoko Fukuda, Elena A. Marchuk, Ekaterina A. Petrunenko, Pavel V. Krestov, Svetlana N. Bondarchuk, Yoko Nishikawa, Takashi Shimamura, Yoshiyasu Fujimura, Koh Nakamura

Abstract: It has been controversial whether Betula tatewakiana, a dwarf birch distributed in Hokkaido of northern Japan, is an endemic species or a synonym of B. ovalifolia broadly distributed in northeast Asia. The endemic hypothesis is based on the idea that B. tatewakiana is diploid while B. ovalifolia is tetraploid and that they are separated based on the ploidy level; however, no chromosome data have actually been published before. Resolving the taxonomic problem is crucial also in judging the conservation priority of B. tatewakiana in a global perspective. Our chromosome observation revealed that B. tatewakiana is tetraploid as well as B. ovalifolia. We also conducted morphological observations and clarified that B. tatewakiana is morphologically identical to B. ovalifolia in white hairs and dense resinous glands respectively on adaxial and abaxial leaf surfaces, in which they differ from closely related species in the same section Fruticosae. We conclude that the hypothesis that B. tatewakiana is a Hokkaido endemic based on the ploidy level is not supported and that B. tatewakiana should be merged with B. ovalifolia.

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Short Communication Wed, 23 Dec 2020 09:30:32 +0200
Carpinus gigabracteatus, a new species from southeast Yunnan, China https://phytokeys.pensoft.net/article/49488/ PhytoKeys 145: 47-56

DOI: 10.3897/phytokeys.145.49488

Authors: Zhiqiang Lu

Abstract: Carpinus gigabracteatus Z. Qiang Lu, a new hornbeam species from southeast Yunnan of China, is described and illustrated in this study. It possesses extremely large bracts and is closely related to C. tsaiana Hu and C. tschonoskii Maxim., based on the characters of large bract size and bracts without lobes at the base of inner margins. Furthermore, morphological comparison suggested it was distinctly different from C. tschonoskii by a series of characters from leaf, infructescence, bract and nutlet and from C. tsaiana by its leaf length to width ratio (1.4–2.0 vs. 2.0–2.4), lateral veins significantly impressed adaxially, number of lateral veins on each side of midvein (9–14 vs. 14–17), bract length (3.9–4.8 vs. 2.5–3.2 cm) and bract length to width ratio (2.3–3.1 vs. 1.5–2.1). Therefore, this hornbeam, based on only one population from southeast Yunnan, is here erected as a new species, named as C. gigabracteatus.

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Research Article Fri, 10 Apr 2020 11:16:48 +0300
Carpinus tibetana (Betulaceae), a new species from southeast Tibet, China https://phytokeys.pensoft.net/article/23639/ PhytoKeys 98: 1-13

DOI: 10.3897/phytokeys.98.23639

Authors: Zhiqiang Lu, Ying Li, Xiaoyue Yang, Jianquan Liu

Abstract: A new species Carpinus tibetana Z. Qiang Lu & J. Quan Liu from southeast Tibet is described and illustrated. The specimens of this new species were previously identified and placed under C. monbeigiana Hand.-Mazz. or C. mollicoma Hu. However, the specimens from southeast Tibet differ from those of C. monbeigiana from other regions with more lateral veins (19–24 vs 14–18) on each side of the midvein and dense pubescence on the abaxial leaf surface, while from those of C. mollicoma from other regions differ by nutlet with dense resinous glands and glabrous or sparsely villous at apex. Principal Component Analyses based on morphometric characters recognise the Tibetan populations as a separate group. Nuclear ribosomal ITS sequence variations show stable and distinct genetic divergences between the Tibetan populations and C. monbeigiana or C. mollicoma by two or three fixed nucleotide mutations. Phylogenetic analysis also identified three respective genetic clusters and the C. mollicoma cluster diverged early. In addition, the Tibetan populations show a disjunct geographic isolation from the other two species. Therefore, C. tibetana, based on the Tibetan populations, is here erected as a new species, distinctly different from C. monbeigiana and C. mollicoma.

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Research Article Wed, 2 May 2018 12:30:36 +0300