岩生剪股颖
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中文名:岩生剪股颖 拉丁学名:Agrostis sinorupestris 界:植物界 门:被子植物门 纲:单子叶植物纲 目:禾本目 科:禾本科 亚 科:早熟禾亚科 族:剪股颖族 属:剪股颖属 种:岩生剪股颖 |
岩生剪股颖(yán shēng jiǎn gǔ yǐng)，学名 Agrostis sinorupestris L. Liu ex S. M. Phillips & S. L. Lu，异名：Agrostis rupestris Agrostis sino-rupestris ，是一种生长在中国西藏、云南的草本植物。 [1]
目录
岩生剪股颖形态特征
多年生。秆稠密丛生，直立而细弱，高12-20厘米；直径0.5毫米，具2-3节。叶鞘长于或短于节间；叶舌干膜质，很短，先端圆或截平；
叶片窄线形，长3-15毫米，宽1-1.5毫米，内卷或扁平，微粗糙。圆锥花序披针形，稍紧缩，暗紫色，长3-8厘米，每节具2-6分枝，分枝长达4厘米，平滑；
小穗长3.2-3.5毫米，穗梗平滑；颖片披针形，两颖稍不等长，第一颖比第二颖长约0.3毫米，平滑，脊上微粗糙；外稃长2.1-2毫米，先端微有齿，芒自外稃背面的中部伸出，长4-5毫米；
基盘两侧有长约0.2毫米的短毛；内稃长约0.6毫米；花药长圆形，长约0.6毫米。颖果椭圆形，长约1.2毫米。花果期夏秋季。
Type:China. Yunnan: E slopes of Lijiang Snow Range, Yangtze watershed, 1923-1924, J. F. Rock 10774 (holotype, US-1214302).
Haec species A. rupestri Allioni affinis, sed ab ea arista ex medio (non prope basim) lemmatis exorienti atque antheris brevioribus (0.6–0.8 mm, non 1–2 mm) differt.
Agrostis hugoniana Rendle var. aristata Keng ex Y. C. Yang.
Perennial, densely tufted. Culms erect, slender, 12–20(–30) cm tall, ca. 0.5 mm in diam., 2–3-noded. Leaf sheaths longer or shorter than internodes; leaf blades linear, flat or involute, 3–15 cm × 1–2 mm, scabrid; ligule very short, apex round or truncate. Panicle slightly contracted, lanceolate in outline, 3–8 cm; branches 2–6 per node, up to 4 cm, smooth or sparsely scabrid. Spikelets 2.8–3.5 mm, dark purple; glumes lanceolate, unequal, lower glume ca. 0.3 mm longer than upper glume, keel scabrid, apex acute; callus hairs ca. 0.2 mm; lemma ca. 2 mm, awned from middle of back, apex slightly toothed; awn weakly geniculate, 3.5–5 mm; palea 0.4–0.6 mm. Anthers 0.6–0.8 mm. Fl. and fr. summer and autumn.
- Stony mountain slopes; 3500–4000 m. Sichuan, Xizang, Yunnan.
There is a good illustration of Agrostis sinorupestris in Keng (Fl. Ill. Pl. Prim. Sin. Gram. 545. 1959, as "Agrostis rupestris"). The species is very similar to delicate forms of A. nervosa, but differs by the presence of awns.
The name "Agrostis sinorupestris L. Liou" (Vasc. Pl. Hengduan Mts. 2: 2252. 1994) belongs here, but was not validly published because no Latin description was provided. The name Agrostis rupestris Allioni has been misapplied to this species in the Chinese literature. That species is confined to mountains in Europe and differs by its lower awn insertion on the lemma back (near the base to the lower 1/3) and longer anthers 1–2 mm.
分类文献
《中国植物志》 第9(3)卷 (1987) >> 244页 PDF >> 岩生剪股颖 Agrostis rupestris
SYN 注：学名已修订，接受名为Agrostis sinorupestris。 20.岩生剪股颖（禾本科图说）
Agrostis rupestris All. Fl. Pedem. 2; 237. 1785; 禾本科图说544.图473. 1959; Tzvel. Poac. URSS 335. 1976.
岩生剪股颖生长环境
生长于海拔3700-4000米的山坡上。
岩生剪股颖分布范围
分布于中国西藏、云南。