Checklist to the Elatostema (Urticaceae) of Vietnam including 19 new records, ten new combinations, two new names and four new synonyms
Checklist to the Elatostema (Urticaceae) of Vietnam including 19 new records, ten new combinations, two new names and four new synonyms
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越南 Elatostema（荨麻科）清单，包括 19 个新记录、10 个新组合、2 个新名称和 4 个新同义词
DOI：
10.7717/peerj.6188
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发表时间：
2019-01-10
期刊：
影响因子：
2.7
通讯作者：
Wei, Yi-Gang
中科院分区：
文献类型：
--
作者：
Fu, Long-Fei;Monro, Alex;Wei, Yi-Gang
楼梯草属（荨麻科）包括数百种草本植物，分布于热带和亚热带非洲、亚洲、澳大利亚和大洋洲。最丰富的物种出现在东南亚的石灰岩岩溶上。楼梯草属的分类学修订基本上已经过时，并且在楼梯草属和赤车属的划分上相互矛盾。东南亚和世界各地的大多数植物标本馆都含有大量未经鉴定的材料。作为一个更广泛的修订楼梯草在东南亚的一部分，我们提出了一个更新的清单越南实地考察的基础上，在世界各地的标本馆，审查的模式材料和命名。我们承认77个分类群（75种和2种下分类群）的楼梯草在越南，其中23个以前归因于赤车属。其中19个是该国的新记录，即，e. attenuatoides、E. austrosinense、中华绒螯蟹E. backeri、黑尾拟步行虫E. brunneinerve、黑脉艾美球虫E. crassiusculum、E. crenatum、钝齿E. fengshanense、E. glochidioides、钩毛藻E.软藓E. nanchuanense、川鄂小蜂E.长圆叶E. obtusum、E. oppositum、E. pergameneum、E. prunifolium、E. pseudolongipes、拟长柄真杆菌E. pycnodontum，密齿真齿线虫E. salvinioides和E.西畴。我们把E. baviensis与E. platyphyllum、扁叶蜂E. colaniae与E. myrtillus、大角拟青霉P.macroceras与E. hookerianum和P.tetramera为E.解剖学第一次14个分类群（所有公认的分类群的18%）是越南特有的，这使得楼梯草属在这个国家的特有种最丰富的属之一;这种特有的水平是在兰科观察到的水平。我们的清单表明，楼梯草属植物的最高多样性和特有性发生在北方越南，有最大的北方越南西南部的区系相似性。并对植物区系区系之间的关系进行了探讨。在越南63个省级单位中，有33个省份没有楼梯草属植物的记录，包括所有最南端的省份。我们建议，进一步研究楼梯草在越南中部和南部的多样性是非常必要的。
Elatostema (Urticaceae) comprises several hundred herbaceous species distributed in tropical and subtropical Africa, Asia, Australia and Oceania. The greatest species richness occurs on limestone karst in Southeast Asia. Taxonomic revisions of Elatostema are largely out of date and contradict each other with respect to the delimitation of Elatostema and Pellionia. Most herbaria in SE Asia and worldwide contain significant amounts of unidentified material. As part of a broader revision of Elatostema in SE Asia, we present an updated checklist for Vietnam based on field visits, a review of specimens in herbaria worldwide, a review of type material and nomenclature. We recognize 77 taxa (75 species and two infraspecific taxa) of Elatostema in Vietnam, 23 of which were previously ascribed to Pellionia. Nineteen of these are new records for the country, i.e., E. attenuatoides, E. austrosinense, E. backeri, E. brunneinerve, E. crassiusculum, E. crenatum, E. fengshanense, E. glochidioides, E. malacotrichum E. nanchuanense, E. oblongifolium E. obtusum, E. oppositum, E. pergameneum, E. prunifolium, E. pseudolongipes, E. pycnodontum, E. salvinioides and E. xichouense. We place E. baviensis in synonymy of E. platyphyllum, E. colaniae in synonymy of E. myrtillus, P. macroceras in synonymy of E. hookerianum, and P. tetramera in synonymy of E. dissectum for the first time. Fourteen taxa (18% of all the recognized taxa) are endemic to Vietnam, which makes Elatostema one of the richest genera for endemic species in this country; this level of endemism is comparable to levels observed in Orchidaceae. Our checklist suggests that the highest diversity and endemism of Elatostema occurs in northern Vietnam, and that there is the greatest floristic similarity of northern Vietnam to SW China. The relationship among floristic regions is also investigated. We could find no records of Elatostema for 33 out of 63 provincial units of Vietnam, including all the southernmost provinces. We propose that further studies on the diversity of Elatostema in central and southern Vietnam are severely needed.