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中文摘要：
基于21个形态性状，对34个赖草属类群进行了表型分支分析。经筒约分析，得到了70颗同等最大筒约分支树，其严格一致树显示：①赖草属在形态上为高水平的分化，在组间及种问均存在着广泛的变异，不支持现有的赖草属分组；②北美的赖草属植物与欧亚大陆赖草属植物亲缘关系较远；③L．duthiei、L．duthieivar．longearistatus和L．coreanus与其他赖草植物的亲缘关系较近，支持将其从猬草组合到赖草属中。鉴于性状状态间存在着较多的平行和逆转进化，同时性状状态间的演化可能平行的、多次的或者是特化的，这样复杂的演化关系很难通过筒约化的分支分析来重建，结合细胞学和DNA序列分析很可能是必需的。
英文摘要：
Based on 21 morphological characters, a cladistic analysis of 34 Leymus species was conducted. The parsimony analysis yielded 70 equally most parsimonious trees and a strict consensus tree. The results indicated that： （1） Leymus species have rich variation in in these morphological characteristics, which is not agreement with the subdivison of Leymus; （2） the Leymus species in North America differed morphologically from the Eurasian Leymus species; （3） L. duthiei, L. duthiei var. longearistatus, and L. coreanus are closely related to other Leymus species, and it is reasonable to transfer these taxa from Hystrix to Leyrnus. In addition, the high level distribution of homoplastic characters in Leymus, together with the parallel or multiple evolution, makes it difficult to reconstruct phylogenetic tree by parsimony analysis very difficult. Therefore, it is necessary to combine the morphological data with DNA sequence data to reconstruct phylogeny of Leymus.
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