对10个狗牙根〔Cynodon dactylon(L.)Pers.〕和2个非洲狗牙根(C. transvaalensis Burtt-Davy)种源的13个外部形态性状进行了实地观测和统计分析。结果表明,与狗牙根相比,非洲狗牙根的叶片宽度较窄,穗支数较少,小穗较长,节间直径较细,穗支长度较短,差异显著;非洲狗牙根的叶片、葡匐茎及柱头的颜色与狗牙根有明显不同,因此,叶片宽度、节间直径、穗支数、穗支长度、小穗长度、叶片色泽、匍匐茎色泽和柱头色泽8个外部形态性状可作为鉴别这2个种的形态学指标。

Thirteen morphological features of ten provenances of Cynodon dactylon(L.)Pers. and two provenances of C. transvaalensis Burtt-Davy were analyzed and compared. The results showed that compared to C. dactylon,the leaf width of C. transvaalensis was narrower, inflorescence number was fewer, internode diameter was thinner, and its inflorescence length was shorter while spikelet longth was longer. There were significant differences in above five indexes between C. dactylon and C.transvaalensis. Inaddition,  leaf,  stolon and style. color of  C.transvaalensis was significant difference to that of C. dactylon. Therefore, the eight morphological features of leaf width, internode diameter, inflorescence number, inflorescence and spikelet length, and color of leaf, stolon and style, can be used as morphological indexes to distinguish this two species.