岩生剪股穎
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中文名:岩生剪股穎 拉丁學名:Agrostis sinorupestris 界:植物界 門:被子植物門 綱:單子葉植物綱 目:禾本目 科:禾本科 亞 科:早熟禾亞科 族:剪股穎族 屬:剪股穎屬 種:岩生剪股穎 |
岩生剪股穎(yán shēng jiǎn gǔ yǐng)，學名 Agrostis sinorupestris L. Liu ex S. M. Phillips & S. L. Lu，異名：Agrostis rupestris Agrostis sino-rupestris ，是一種生長在中國西藏、雲南的草本植物。 [1]
目錄
岩生剪股穎形態特徵
多年生。稈稠密叢生，直立而細弱，高12-20厘米；直徑0.5毫米，具2-3節。葉鞘長於或短於節間；葉舌干膜質，很短，先端圓或截平；
葉片窄線形，長3-15毫米，寬1-1.5毫米，內卷或扁平，微粗糙。圓錐花序披針形，稍緊縮，暗紫色，長3-8厘米，每節具2-6分枝，分枝長達4厘米，平滑；
小穗長3.2-3.5毫米，穗梗平滑；穎片披針形，兩穎稍不等長，第一穎比第二穎長約0.3毫米，平滑，脊上微粗糙；外稃長2.1-2毫米，先端微有齒，芒自外稃背面的中部伸出，長4-5毫米；
基盤兩側有長約0.2毫米的短毛；內稃長約0.6毫米；花葯長圓形，長約0.6毫米。穎果橢圓形，長約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.
分類文獻
《中國植物志》 第9(3)卷 (1987) >> 244頁 PDF >> 岩生剪股穎 Agrostis rupestris
SYN 註：學名已修訂，接受名為Agrostis sinorupestris。 20.岩生剪股穎（禾本科圖說）
Agrostis rupestris All. Fl. Pedem. 2; 237. 1785; 禾本科圖說544.圖473. 1959; Tzvel. Poac. URSS 335. 1976.
岩生剪股穎生長環境
生長於海拔3700-4000米的山坡上。
岩生剪股穎分布範圍
分布於中國西藏、雲南。