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广西楼梯草属三新种和一新变种
韦毅刚1, 王文采2*
1. 广西壮族自治区 中国科学院 广西植物研究所, 广西 桂林 541006;2.中国科学院 植物研究所 系统与进化植物学国家重点实验室, 北京 100093
摘要:
描述了在中国广西发现的楼梯草属3新种和1新变种:马山楼梯草Elatostema mashanense W.T.Wang & Y.G.Wei与滇黔楼梯草E.backeri H.Schroter相近缘,但茎被向上展的短糙伏毛,叶顶端通常尾状渐尖,边缘具小牙齿或圆齿,具三出脉而与后者相区别。变种毛茎圆序楼梯草Elatostema gyrocephalum W.T.Wang & Y.G.Wei var. pubicaule W.T.Wang & Y.G.Wei的茎在近顶端处密被短柔毛,雌花序托不分裂,苞片中部黑色而与模式变种不同。黑苞楼梯草Elatostema nigribracteatum W.T.Wang & Y.G.Wei与显苞楼梯草E.bracteosum W.T.Wang在亲缘关系上相近,但茎被微柔毛,叶有短柄,叶片较小,长达7 mm,纸质,上面无毛,钟乳体较小,长0.1~0.15 mm,雌花序分裂成2个二回头状花序,苞片和小苞片呈黑色,无毛,花序托上有数条小枝,而与后者明显区分。天峨楼梯草Elatostema tianeense W.T.Wang &Y.G.Wei似E.hookeriano Wedd,但叶在边缘下部三分之一以上或中部以上有较多小牙齿,具半离基三出脉,托叶较小,狭三角形或三角状钻形,长1~2.5 mm,雌花枝粗壮,雌苞片条状三角形,无角状突起而不同。
关键词:  楼梯草属  马山楼梯草  毛茎圆序楼梯草  黑苞楼梯草  天峨楼梯草  荨麻科  新种  新变种  广西
DOI:
分类号:Q949
Fund project:
Three new species and one new variety of Elatostema J.R.& G.Forst.(Urticaceae)from Guangxi
WEI Yi-Gang1, WANG Wen-cai2*
1. 1.Guangxi Institute of Botany, Guangxi Zhuang Autonomous Region and the Chinese Academy of Sciences, Guilin 541006, China;2.State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China
Abstract:
Three new species and one new variety of Elatostema(Urticaceae)are described from Guangxi,China.
Key words:  Elatostema  Elatostema mashanense  Elatostema gyrocephalum var.pubicaule  Elatostema nigribracteatum  Elatosteema tianeense  Urticaceae  new species  new variety  Guangxi
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