栏目

紧序剪股颖Agrostis contracta Y. C. Tong ex Y. C. Yang

紧序剪股颖Agrostis contracta Y. C. Tong ex Y. C. Yang

科名:禾本科 Gramineae

属名:剪股颖属 Agrostis

《中国植物志》第9(3)卷245页
  21.紧序剪股颖(植物研究)图版60:1-7
  Agrostis contracta Y. C. Tong ex Y. C. Yang, 植物研究4 (4) : 100. 图5, 1984.
  多年生,高30-50厘米。秆粗1-1.5毫米,具3-4节,一般平滑,仅花序下粗糙。叶鞘抱茎,边缘近膜质,基部长于节间,上部比节间短;叶舌膜质,长1-2毫米,先端平截;叶片扁平,长10-13厘米,宽3-5毫米,先端急尖,边缘和脉上粗糙。花序狭披针形,长10-15厘米,宽3厘米,绿带紫色,分枝密集,每节有5-10枚,分枝与穗梗近光滑;小穗多数;颖片披针形,第一颖长2.5-3毫米,第二颖稍短于第一颖,脊上粗糙;外稃长1.5-1.7毫米,先端平截而有细齿,芒着生在外稃的2/3-3/4处,或近中部着生,长约3毫米,中部膝曲,伸出小穗之外,基盘具约0.2毫米的毛;内稃长圆形或倒卵形、近全缘,长约0.3毫米;花药椭圆形,长约0.6毫米。花果期8-10月。
  产云南的碧江、贡山。生于海拔4000米左右的高山草甸地区。模式标本采自云南碧江。
  本种接近川西剪股颖(A. hugoniana Rendle var. aristata Keng),但区别在于,植株较高大,叶片较宽,花序具密集的小穗,芒从外稃的2/3-3/4处生出。

《Flora of China》 Vol. 22 (2006)
Agrostis sinocontracta  S. M. Phillips & S. L. Lu
紧序剪股颖   jin xu jian gu ying
Replaced synonym: Agrostis contracta Y. C. Tong ex Y. C. Yang, Bull. Bot. Res., Harbin 4(4): 100. 1984, not Agrostis contracta F. Mueller ex J. D. Hooker, Fl. Tasman. 2: 116. 1858.
Perennial, tufted. Culms erect, 30–50 cm tall, 1–2 mm in diam., 3–4-noded. Leaf sheaths loose, smooth; leaf blades linear, soft, culm blades 10–14 cm × 3–5 mm, blades of tillers ca. 1 mm wide, abaxial surface scabrid or almost smooth, adaxial surface scabrid; ligule 1–2.5 mm, apex truncate. Panicle laxly contracted, lanceolate in outline, 10–15 cm; branches 1–3 at each node or sometimes secondary branching from base, narrowly ascending, 2.5–3.5 cm, almost smooth, a few widely scattered scabridities, bearing spikelets for most of length. Spikelets 2.5–3 mm, green tinged purplish gray; glumes narrowly lanceolate, lower glume slightly longer than upper glume, keel scabrid, apex acuminate; callus hairs 0.1–0.2 mm; lemma ca. 1/2 spikelet length, awned from upper 1/4–1/3, apex emarginate-denticulate; awn recurved in right angle from lower 1/3, slightly twisted below bend, 3–3.3 mm; palea ca. 0.25 mm. Anthers 0.5–0.7 mm. Fl. and fr. Aug–Oct.
* Alpine meadows; ca. 4000 m. NW Yunnan (Bijiang, Gongshan).
Agrostis filipes J. D. Hooker, from Kashmir and the Khasi Hills of NE India, also has awns arising from above the middle of the lemma back and a small palea. It differs in having narrower culm leaf blades 1–2.5 mm wide, a densely contracted panicle, and a fine awn 1–2 mm.

TOP