小柱芥属植物分类及地理分布研究

小柱芥属(Microstigma Trautv.)为十字花科(Brassicaceae)一寡种属,目前由于缺乏系统研究,存在属内物种划分不明确,地理分布不确定等问题。该文通过在甘肃、内蒙古的标本采集,以及GBIF的标本记载和相关文献的查阅,对小柱芥属植物的形态特征和地理分布进行了详细描述,确定了小柱芥属内的物种数目并编制了属内物种检索表,绘制了地理分布图。结果表明:支持尤那托夫小柱芥(Microstigma junatovii)为一个独立的种,同时该种为中国新分布记录种;确定小柱芥属为蒙古高原近特有属,含4个种。该研究不仅丰富了中国小柱芥属的物种多样性,为小柱芥属的植物鉴定提供了理论依据,也为蒙古高原植物区系、植被等相关研究积累了新资料。

Plant classification and geographical distribution of Microstigma Trautv.

Microstigma Trautv. is an oligo-species genus of Brassicaceae. Its division of species and geographic distribution has not been systematic research. Basing on specimen collected from Gansu and Inner Mongolia, specimen searched on GBIF and the other relative literatures on Microstigma Trautv., we described its morphological characteristics and distribution in detail, clarified the number of species and compiled a key to these species within Microstigma Trautv., mapped its geographic distribution. The results indicate that Microstigma junatovii is an independent and newly recorded species in China. Microstigma Trautv. is a near-endemic genus in the Mongolian Plateau, composed of 4 species. Our study not only enriches species diversity of Microstigma Trautv. in China, providing theoretical basis for plant identification in Microstigma Trautv., but also accumulates new information for future related research on the flora and vegetation of the Mongolian Plateau.