| 摘要: |
| 该文描述了自云南东南部发现的荨麻科楼梯草属一新种,南溪楼梯草(Elatostema nanxiense)。此新种与田林楼梯草(E. tianlinense)相似,但其叶具三出脉,边缘具浅圆齿或小钝齿,雄总苞苞片较少,8枚,排成一层,背面有1～3条纵肋,只1枚在顶端具角状突起而与后者相区别。此外,此新种与盘托楼梯草系的广布种盘托楼梯草(E. dissectum)的区别在于其茎被糙伏毛,叶呈椭圆形,具三出脉,雄头状花序的花序梗较短,雄总苞苞片较少,呈宽卵形或横长方形,背面有1～3条纵肋,雄小苞片有缘毛。 |
| 关键词: 荨麻科, 楼梯草属, 新种, 云南 |
| DOI：10.11931/guihaia.gxzw201702025 |
| 分类号:Q949.737.5 |
| 文章编号:1000-3142(2019)03-0294-03 |
| Fund project: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项目 [Supported by the Program of State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences]。 |
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| Elatostema nanxiense, a new species of Urticaceae from Yunnan Province |
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WANG Wen-tsai1, WU Zengyuan2
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1. State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences,
Beijing 100093, China;2. Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming
Institute of Botany, Chinese Academy of Scienses, Kunming 650201, China
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| Abstract: |
| A species of the genus Elatostema(Urticaceae), E. nanxiense, is described as new from southeastern part of Yunnan Province. It is similar to E. tianlinense W. T. Wang, differing from the latter in its crenate or obtusely denticulate, trinerved leaves, and fewer 1-seriate and 1-3-ribbed staminate involucral bracts. Besides, it differs from E. dissectum, which is a wide-spread species in sect. Elatostema ser. Dissecta W. T. Wang, in its strigillose stems, elliptic and trinerved leaves, shorter staminate peduncles, fewer broadly ovate or transversely rectangular and 1-3-ribbed staminate involucral bracts, and glabrous staminate bracteoles. |
| Key words: Urticaceae, Elatostema, new species, Yunnan Province |
