广西楼梯草属五新种

Five new species of Elatostema J.R.et G. Forst.(Urticaceae)from Guangxi, China

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

Key words:  Elatostema  Elatostema microcarpa  Elatostema gyrocephala  Elatostema binatum  Elatostema hechiense  Elatostema huanjiangense  Urticaceae  new species

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Elatostema 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Elatostema 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Elatostema 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Elatostema huanjiangense W.T.Wang & Y.G.Wei可能与樟叶楼梯草Elatostema petelotii Gangnep.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,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。

Abstract:

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 Zhuangzu Autonomous Region and the Chinese Academy of Sciences, Guilin 541006, China