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伊吾赖草 |
百合超目 Lilianae 禾本目 Poales 禾本科 Poaceae 赖草属 Leymus 伊吾赖草 Leymus yiunensis |
伊吾赖草(yī wú lài cǎo),学名 Leymus yiunensis N. R. Cui & D. F. Cui,异名:Leymus yiwuensis ,多年生草本,高25—35厘米。产于海拔约2400米,分布于新疆(Burqin,Yecheng,Yiwu)。 [1]
形态特征
具下伸或横走的根茎,秆成疏丛,直立,光滑无毛。茎生叶片通常内卷。穗状花序直立,稠密。产伊吾、哈密。优良牧草。是小麦和大麦的近缘种植物。
膝曲的秆直立或,14-35厘米高,有节的1的通常,平滑,无毛。 叶鞘平滑,无毛或边缘具缘毛; 叶舌0.5-1毫米,膜; 叶片内卷,4-9厘米×毫米,背面无毛,正面和边缘粗糙。
穗状花序直立,绿色,紧密, ( 3-)5-11 * (0.35-) 0.5-1 厘米; 青春期的轴,通常具白色,长,柔软头发在节点上。 每节,0.7-1.1厘米,具3-5小穗2-8)小花;
小穗轴密被短柔毛。 通常颖片包括基部的第一个外稃,狭披针形,近等长,5-9毫米,1脉,下部短柔毛,上部粗糙,先端缩小,。 披针形的Lemma,清楚5脉,背面密被,白色,柔软的头发,边缘具缘毛;
首先,外稃7-9毫米包括点1-1.5毫米; 胼胝体具柔软毛0.5张-1毫米内稃近相等外稃,具缘毛沿着龙骨状。 花药黄,2-3毫米子房椭圆形,先端被微柔毛。 花期 以及果期6-8月。
FOC >> Vol.22 (2006) >> Poaceae >> Leymus | eFloras.org Link 7.Leymus yiunensis N. R. Cui & D. F. Cui伊吾赖草 yi wu lai cao
伊吾赖草 Leymus yiunensis Leymus yiwuensis N. R. Cui ex L. B. Cai, nom. illeg. superfl.Culms erect or geniculate, 14–35 cm tall, usually 1-noded, smooth, glabrous.
Leaf sheath smooth, glabrous or margin ciliate; ligule 0.5–1 mm, membranous; leaf blade involute, 4–9 cm × 0.1–2.5 mm, abaxial surface glabrous, adaxial surface and margin scabrous. Spike erect, green, dense, (3–)5–11 × (0.35–) 0.5–1 cm; rachis pubescent, usually with white, long, soft hairs on nodes.
Spikelets 2 per node, 0.7–1.1 cm, with 3–5(–8) florets; rachilla densely pubescent. Glumes usually covering base of first lemma, narrowly lanceolate, subequal, 5–9 mm, 1-veined, proximally pubescent, distally scabrous, apex narrowed, awnlike.
Lemma lanceolate, distinctly 5-veined, abaxially with dense, white, soft hairs, margin ciliate; first lemma 7–9 mm including point 1–1.5 mm; callus with soft hairs 0.5–1 mm. Palea subequaling lemma, ciliate along keels distally. Anthers yellow, 2–3 mm. Ovary elliptic, apex puberulent. Fl. and fr. Jun–Aug.
产地生境
- Meadows; ca. 2400 m. Xinjiang (Burqin, Yecheng, Yiwu).
草甸 海拔约2400米,新疆(Burqin,Yecheng,Yiwu)。
辨析
Leymus yiwuensis was described as a new species by Cai (Bull. Bot. Res., Harbin 17: 29. 1997) based on the same holotype specimen (N. R. Cui 820064, XJA) as L. yiunensis.
Leymus yiwuensis被蔡描述成一新种(公牛。 肤蝇等幼虫。 研究, 哈尔滨 17: 29. 1997) 基于作为L. yiunensis的相同的主模式标本(N. R. Cui 820064,XJA)。