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
Dongguan Botanical Garden, Dongguan 523086, China Dongguan Botanical Garden Dongguan China.
Enshi Dongsheng Plant Development Co. Ltd., Enshi 445000, China Enshi Dongsheng Plant Development Co. Ltd. Enshi China.
PhytoKeys. 2022 Nov 22;214:27-38. doi: 10.3897/phytokeys.214.90004. eCollection 2022.
The previously reported begonias in a limestone forest of Guangxi mainly belong to Begoniasect.Coelocentrum Irmscher. In this article, we described and illustrated a new species in sect. Platycentrum (Klotzsch) A.DC., 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 S.H. Huang and Irmscher, but differs from the latter two in its narrower oblique-ovate asymmetric 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 and . 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.
此前报道的广西石灰岩森林中的秋海棠主要属于秋海棠属的Coelocentrum组。在本文中，我们描述并展示了广西西南部喀斯特森林中发现的一个新的侧膜胎座组（Platycentrum (Klotzsch) A.DC.）秋海棠物种。该秋海棠与S.H. Huang和Irmscher显示出高度的形态相似性，但在叶片为更窄的斜卵形不对称、雌花有4（偶尔6）枚花被片以及更小的膜质花序苞片方面与后两者不同。基于ITS序列数据的分子系统发育分析支持该新物种为单系类群且与其他类群不同。考虑到其分布狭窄以及人类活动的干扰，根据世界自然保护联盟（IUCN）红色名录类别和标准，新分类群的保护状况被评估为“易危”（VU B1, B2 ab (i, iv, v), D2）。
