中国披碱草属一新记录种——定结披碱草

Elymus duthiei (Melderis) G. Singh (Poaceae, Triticeae), a newly recorded species from China

摘要: 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。

Abstract: Elymus duthiei(Melderis) G. Singh, newly recorded from Xizang, China, is described and illustrated in detail. Morphologically, the species is similar toE. anthosachnoides(Keng) Á. Löve ex B. R. Lu andE. glaberrimus(Keng & S. L. Chen) S. L. Chen but differs from the former in height and diameter of culms, number 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 distribution data are provided.