本文报道了采自西藏定结县的披碱草属一中国新记录种,即定结披碱草(Elymus duthiei(Melderis)G.Singh).该新记录种形态上与假花鳞草(E.anthosachnoides(Keng)Á.Löve ex B.R.Lu)和光穗披碱草(E.glaberrimus(Keng&S.L.Chen)S.L.Chen)相似,但与前者的差异在于秆的高度和直径、节的数目、叶片宽度、小穗大小及被毛类型,与后者的区别在于分布、秆高度、小穗被毛程度和芒的长度不同.本文提供了定结披碱草的生境照、精细解剖照、描述和分布.
Elymus duthiei(Melderis)G.Singh(Poaceae,Triticeae),a newly recorded species from China
Elymus duthiei(Melderis)G.Singh,newly recorded from Xizang,China,is described and illustrated in detail.Morphologically,the species is similar to E.anthosachnoides(Keng)Á.Löve ex B.R.Lu and E.glaberrimus(Keng&S.L.Chen)S.L.Chen but differs from the former in height and diameter of culms,num-ber of nodes,width of leaf blades,and type of trichome and size of spikelets,and from the latter in distribution,height of culms,type of trichome of spikelets,and awn length.Detailed photo plates,descriptions,and distri-bution data are provided.
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