垂穗賴草
垂穗賴草 |
百合超目 Lilianae 禾本目 Poales 禾本科 Poaceae 賴草屬 Leymus 垂穗賴草Leymus pendulus L. B. Cai |
垂穗賴草(chuí suì lài cǎo),學名 Leymus pendulus L. B. Cai ,植株具延長根狀莖。 膝曲下面的稈直立或稍,60-150厘米高,2-3毫米直徑, 4-6有節,平滑。 葉鞘無毛或者粗糙,基生者宿存,通常瓦解進纖維; 葉舌2-3.5毫米,膜,先端鈍; 葉片綠色,平的或內卷, 5-22(-53) * 0.2-0.7 厘米,兩面粗糙,邊緣疏生具微刺的或纖毛蟲。 穗狀花序懸架,帶褐色,非常疏鬆,產於海拔2300-2400米的林地邊緣和山谷中,分布於青海(西寧)。 [1]
目錄
形態特徵
植株具延長根狀莖。 膝曲下面的稈直立或稍,60-150厘米高,2-3毫米直徑, 4-6有節,平滑。 葉鞘無毛或者粗糙,基生者宿存,通常瓦解進纖維;
葉舌2-3.5毫米,膜,先端鈍; 葉片綠色,平的或內卷, 5-22(-53) * 0.2-0.7 厘米,兩面粗糙,邊緣疏生具微刺的或纖毛蟲。
穗狀花序懸架,帶褐色,非常疏鬆,23-32厘米; 軸節間的15-30毫米中間以下,6-12毫米上部,密被短柔毛。 小穗2或3 每節,1.1-1.5厘米,具5-9;
小穗軸節間的1-1.5毫米,密被微柔毛。 線狀披針形,近等長的穎片,9-11毫米,草質,1脈,粗糙背面,邊緣疏生具緣毛的在中部以上。
披針形的Lemma,昏暗5-脈,稀少具微刺背面,青春期或者接近邊緣; 首先外稃6-9毫米, 花葯黃或帶紫色,2.5-3.5毫米穎果棕色,先端短柔毛。
FOC >> Vol.22 (2006) >> Poaceae >> Leymus | eFloras.org Link 8.Leymus pendulus L. B. Cai垂穗賴草 chui sui lai cao
Plants with extended rhizomes. Culms erect or slightly geniculate below, 60–150 cm tall, 2–3 mm in diam., 4–6-noded, smooth. Leaf sheath glabrous or scabrous, basal ones persistent, usually disintegrating into fibers; ligule 2–3.5 mm, membranous, apex obtuse; leaf blade green, flat or involute, 5–22(–53) × 0.2–0.7 cm, both surfaces scabrous, margin sparsely spinulose or ciliate.
Spikes pendent, brownish, very lax, 23–32 cm; rachis internodes 15–30 mm below middle, 6–12 mm distally, densely pubescent. Spikelets 2 or 3 per node, 1.1–1.5 cm, with 5–9 florets; rachilla internodes 1–1.5 mm, densely puberulent.
Glumes linear-lanceolate, subequal, 9–11 mm, herbaceous, 1-veined, scabrous abaxially, margin sparsely ciliate above middle. Lemma lanceolate, obscurely 5-veined, sparsely spinulose abaxially, pubescent along or near margin; first lemma 6–9 mm, with slender awn 2–3 mm.
Palea equaling or slightly longer than lemma, sparsely spinulose along keels, scabrous between keels, apex pointed or bifid. Anthers yellow or purplish, 2.5–3.5 mm. Caryopsis brown, apex pubescent.
產地生境
- Woodland margins, mountain valleys, bases of walls; 2300–2400 m. Qinghai (Xining).