Begonia parvibracteata, a new species in Begonia sect. Platycentrum (Begoniaceae) from Guangxi of China, based on morphological and molecular evidence

文献类型： 外文期刊

第一作者： Feng, Xin-Xin

作者： Feng, Xin-Xin;Huang, Xiao-Feng;Huang, Yu-Ni;Liu, Zhi-Xian;Li, Ren-Kun;Zhou, Jin-Ye;Guo, Wei;Chen, Xiao-Yan;Tian, Dai-Ke;Tian, Dai-Ke

作者机构：

关键词： ITS; morphology; new taxon; southern China; taxonomy

期刊名称：PHYTOKEYS （ 影响因子：1.317； 五年影响因子：1.49 ）

ISSN： 1314-2011

年卷期： 2022 年 214 期

页码：

收录情况： SCI

摘要： The previously reported begonias in a limestone forest of Guangxi mainly belong to Begonia sect. Coelocentrum Irmscher. In this article, we described and illustrated a new species in sect. Platycentrum (Klotzsch) A.DC., Begonia parvibracteata X.X.Feng, R.K.Li & Z.X.Liu, which was discovered in a karst forest of south-western Guangxi. The begonia shows high morphological similarity to B. subhowii S.H. Huang and B. psilophylla Irmscher, but differs from the latter two in its narrower oblique-ovate asymmet-ric leaf blade, 4 (occasionally 6) tepals of pistillate flower and smaller membranous inflorescence bracts. Molecular phylogenetic analysis, based on ITS sequence data, supports the new species as monophyletic and distinct from B. subhowii and B. psilophylla. Considering its narrow distribution and the disturbance of human activities, the conservation status of new taxon is evaluated as "Vulnerable" (VU B1, B2 ab (i, iv, v), D2) according to the IUCN Red List Categories and Criteria.

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