中国赖草属(禾本科)一新种——贫穗赖草

报道了中国西部赖草属一新种———贫穗赖草。该种相似于若羌赖草和广叉赖草,但它不同于前者在于穗状花序的中部或下部具孪生小穗,外稃披针形、无毛,具1.0~1.5 mm长的短尖头,内稃短于外稃1.0~1.5 mm,沿上部脊疏生小刺,叶鞘无毛,具非膜质边缘;不同于后者在于秆较高,叶片内卷,穗状花序稀疏、狭窄,小穗较短,颖较长,外稃披针形、较长,具5条不明显的脉。

Leymus paucispiculus,a New Species of Poaceae from China

A new species of Leymus from western China,L. Paucispiculus L. B. Cai, is described and illustrated. This species is similar to both L. Ruoqiangensis S. L. Lu et Y. H. Wu and L. Devaricatus(Drobov)Tzvelev,but distinguished from the former by having twinborn spikelets in the middle or lower part of the spike,glabrous and lanceolate lemmas with short mucros 1.0～ 1.5 mm long, shorter paleas(usually being shorter than the lemmas by 1.0～ 1.5 mm)with sparse spinules along the upper keels and glabrous leaf sheaths with non-membranous margins, and from the latter by taller culms, involute leaf blades, lax and narrower spikes, shorter spikelets,longer glumes,and lanceolate and longer lemmas with 5 obscure nerves.