细芒羊茅Festuca stapfii E. Alexeev

科名：禾本科 Gramineae

属名：羊茅属 Festuca

《中国植物志》第9(2)卷077页
  47．细芒羊茅（西藏植物志）图版12：1-6
  Festuca stapfii E. Alexeev in Byull. Mosk. Obshch. Ispyt. Prir. Biol. 83(4): 115. 1978. et in Nov. Syst. Pl. Vasc. 17: 25, t. 3. f, 1-4. 1980. ——Festuca undata var. aristata Stapf in Hook. f. Fl. Brit. Ind. 7: 351. 1897; Bor, Grass. Burma Ceyl. Ind. Pakist. 542. 1960; 西藏植物志5: 87. 1987.
  多年生，丛生。秆直立，平滑无毛，高20-70厘米，具3-4节，节呈黑褐色。叶鞘平滑无毛，短于节间；叶舌长1-2毫米，顶具纤毛；叶片纵卷，较柔软，上面粗糙或被短微毛，下面平滑；叶横切面具维管束5，厚壁组织束5-7，仅存于下表皮内，上表皮具稀疏的毛。圆锥花序开展，长10-15厘米；分枝单一或稀具2，细丝状，微粗糙，长3-6厘米；小穗淡绿色，有光泽，长6-8.5毫米，含2-4小花；颖片背部平滑，边缘宽膜质，顶端渐尖，第一颖窄披针形，具1脉，长2-2.5毫米，第二颖宽披针形，具3脉，长3-4.5毫米；外稃背部平滑，具5脉，顶端具长3（5) -8毫米的芒，第一外稃长5-6.5毫米；内稃近等长于外，顶端膜质且微2裂，两脊粗糙；花药长1-1.5毫米；子房顶端平滑稀少量的毛。花果期7-9月。
  产四川、西藏。生于海拔3000-3200米的林缘及山坡草地。分布于尼泊尔、锡金。模式标本采自锡金。

《Flora of China》 Vol. 22 (2006)
Festuca stapfii  E. B. Alexeev
细芒羊茅   xi mang yang mao
Festuca undata Stapf var. aristata Stapf.
Plant tufted; shoots extravaginal. Culms 20–70 cm tall, nodes 2, dark brown. Leaf sheaths smooth or basal sheaths pubescent; auricles present as erect swellings; leaf blades conduplicate, flaccid, 3–10 cm × 0.8–1 mm, veins 7–9; adaxial to abaxial sclerenchyma strands absent, abaxial sclerenchyma in narrow discrete strands; ligule 0.3–0.5 mm, margin ciliate. Panicle loose, open, 6–23 cm; branches 3–6 cm, filiform, scabrid, 1(–2) at lowest node. Spikelets 6–8.5(–9.5) mm, greenish or purplish; florets 3–4(–7); glumes smooth, margins broadly membranous; lower glume narrowly lanceolate, 2–2.5(–3.8) mm; upper glume lanceolate, 3–4.5(–6.5) mm; rachilla internodes 1–1.5 mm; lemmas 5–6.5 mm, smooth, acuminate; awns (3–)5–8 mm; palea keels scabrid. Anthers 1–1.8 mm. Ovary apex glabrous when young, later sparsely hairy. Fl. and fr. Jul–Sep.
Grassy mountainsides, chalky meadows, forest margins; 3000–3200 m. Sichuan, Xizang, Yunnan (E Lijiang mountains) [Bhutan, India (Darjeeling, Sikkim), Nepal].
Festuca undata Stapf, from India (Sikkim), differs by its extravaginal shoots, shorter awns 0.7–1.4 mm, and smaller anthers 0.5–0.7 mm.