| 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 |
| 基金项目: |
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| Three new species and one new variety of Elatostema J.R.& G.Forst.(Urticaceae)from Guangxi |
|
WEI Yi-Gang1, WANG Wen-cai2*
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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
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
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| 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 |
