| 引用本文: | 王文采,韦毅刚.广西楼梯草属五新种[J].广西植物,2016,36(Z1):100-106.[点击复制] |
| WANG Wen-Cai, WEI Yi-Gang.Five new species of Elatostema J. R. et G. Forst.(Urticaceae)from Guangxi, China[J].Guihaia,2016,36(Z1):100-106.[点击复制] |
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| 广西楼梯草属五新种 |
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王文采,韦毅刚
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1.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;2. 广西壮族自治区
中国科学院 广西植物研究所, 广西 桂林 541006
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| 摘要: |
| 描述了在中国广西发现的楼梯草属五新种:小果楼梯草(Elatostema microcarpum W. T. Wang & Y. G. Wei)在体态方面与荔波楼梯草(E. liboense W. T. Wang)极为相似,但茎较低矮,不具软鳞片,叶上面无毛,钟乳体较小而可区别。圆序楼梯草(E. gyrocephalum W. T. Wang & Y. G. Wei)在体态上与浅齿楼梯草(E. crenatum W. T. Wang)相似,但叶两面均有糙伏毛,侧脉较少,4～6对,钟乳体较小,长约0.1 mm而不同。对序楼梯草(E. binatum W. T. Wang & Y. G. Wei)在亲缘关系方面与深绿楼梯草(E. atroviride W. T. Wang)相近,但茎和叶无毛,雄花序托较小,近方形,长度及宽度约6.5 mm,小苞片较小,长约1.5 mm,无毛,可以区别。河池楼梯草(E. hechiense W. T. Wang & Y. G. Wei)似华南楼梯草(E. balansae Gagnep.)但叶的渐尖头全缘,钟乳体较小,长0.1～0.15 mm,雌花序苞片顶端无角状突起,可以区别。环江楼梯草(E. huanjiangense W. T. Wang & Y. G. Wei)可能与樟叶楼梯草(E. petelotii Gagnep.)有亲缘关系,但后者的叶全缘,钟乳体较大,长0.3～0.7 mm,侧脉在狭侧3条,在宽侧4条,雌花序常有长花序梗,而与本种相区别。 |
| 关键词: 楼梯草属, 小果楼梯草, 圆序楼梯草, 对序楼梯草, 河池楼梯草, 环江楼梯草, 荨麻科, 新种 |
| DOI： |
| 分类号:Q949.737.5 |
| 文章编号:1000-3142(2016)增刊1-0100-07 |
| 基金项目:中国科学院知识创新工程(科技基础设施建设专项子项目)[Supported by the Knowledge Innovation Project of the Chinese Academy of Sciences]。 |
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| Five new species of Elatostema J. R. et G. Forst.(Urticaceae)from Guangxi, China |
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WANG Wen-Cai1, WEI Yi-Gang2
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1.State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of
Sciences, Beijing 100093, China;2.Guangxi Institute of Botany, Guangxi Zhuang Autonomous
Region and the Chinese Academy of Sciences, Guilin 541006, China
1.State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of
Sciences, Beijing 100093, China; 2.Guangxi Institute of Botany, Guangxi Zhuang Autonomous
Region and the Chinese Academy of Sciences, Guilin 541006, China
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| Abstract: |
| Five new species of the genus Elatostema(Urticaceae)are described from Guangxi Zhuang Autonomous Region, China:(1)E. microcarpum in habit is similar to E. liboense W. T. Wang, differing in its lower unscaly stems and its leaves which are glabrous adaxially and have smaller cystoliths;(2)E. gyrocephalum in habit is similar to E. crenatum W. T. Wang, differing in its strigose leaves with fewer secondary nerves and smaller cystoliths;(3)E. binatum is related to E. atroviride W. T. Wang, differing in its glabrous stems and leaves, smaller subquadrate staminate receptacles, and smaller glabrous staminate bracteoles;(4). E. hechiense in habit is similar to E. balansae Gagnep, differing in its entire leaf acumens, smaller cystoliths of leaves, and uncorniculate pistillate bracts; and(5)E. huanjiangense is probably related to E. petelotii Gangnep, differing in its few-crenate leaves with smaller cystoliths and fewer secondary nerves and very short pistillate peduncles. |
| Key words: Elatostema, Elatostema microcarpa, Elatostema gyrocephala, Elatostema binatum, Elatostema hechiense, Elatostema huanjiangense, Urticaceae, new species |
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