根据形态和叶片微形态特征讨论无芒披碱草的归并

通过形态学观测和叶片解剖特征分析,比较了无芒披碱草、短芒披碱草及老芒麦3个近缘种的主要性状差异,以探讨无芒披碱草的系统分类归属.结果表明,在外部形态上无芒披碱草与短芒披碱草差异甚小,难以进行区分,但与老芒麦差异明显,是典型的种间关系;在叶片解剖上,无芒披碱草的绝大多数特征与短芒披碱草的一致或类同,可与老芒麦的却存在明显间断.故研究认为:无芒披碱草与短芒披碱草是同一个种,无芒披碱草应作为短芒披碱草的异名.

Reduction on Elymus sinosubmuticus Based on the External Morphology and Micromorphological Characteristics of Leaf Blades

The main character differences among nearest related Elymus sinosubmuticus,E.breviaristatus and E.sibiricus in the genus Elymus were compared by the methods of morphological observation and anatomical analysis of leaf blades.The results show that there is very slight disparity between E.sinosubmuticus and E.breviaristatus in external morphology,the classification of the two species is very difficult;and the differences between E.sinosubmuticus and E.sibiricus are distinct,the two taxa are two different species.Anatomically,the most features of E.sinosubmuticus are consistent with or similar to that of E.breviaristatus,while for E.sibiricus,the discontinuity of characters between them is obviously present.Based on the results of study,the authors believe E.sinosubmuticus and E.breviaristatus to be the same species,and E.sinosubmuticus should be reduced to synonymy of E.breviaristatus.