云南异燕麦Helictotrichon delavayi (Hack.) Henr.

别名：洱源异燕麦;滇异燕麦;

科名：禾本科 Gramineae

属名：异燕麦属 Helictotrichon

《中国植物志》第9(3)卷163页
  10．云南异燕麦（秦岭植物志）图版41：16-19
  Helictotrichon delavayi (Hack.) Henr. in Blumea 3 (3) :430. 1940; 禾本科图说492. 1959; 秦岭植物志1 (1) : 126. 图99. 1976. ——Avena delavayi Hack. in Neue Graser. Oest. Bot. Zeitschr. 52: 189. 1902.
  多年生。秆直立，光滑，高35-50厘米，具2-3节。叶鞘疏松，具倒生瘤毛，短于节间；叶舌膜质，长约1.5毫米，顶端截形，且常撕裂；叶片扁平，边缘内卷，长6-11厘米，宽1.5-2毫米，两面均粗糙。圆锥花序疏松开展，卵状长圆形，长5-10厘米，宽2-3厘米，每节常具2分枝，分枝粗糙，长1-2厘米，每枝着生1-2个小穗；小穗绿色，并带紫红色，长圆形，含3-4小花，长8-10毫米（芒除去）；小穗轴节间长2-2.5毫米，遍生细白毛；颖膜质，披针形，第一颖长5.5-7毫米，常具1条明显脉，第二颖长7-8毫米，具3脉；外稃粗糙，顶端具2齿裂，第一外稃长7.5-9毫米，具5脉，基盘具细白毛，芒自稃体中部以上伸出，长13-15毫米，成熟时一回膝曲；内稃略短于外稃，具2脊，脊上具短纤毛；雄蕊3，花药褐红色，长2-2.5毫米；子房被茸毛。花果期6-8月。
  产陕西、云南等省。生于海拔2100-3700米的草甸草原或林下。模式标本采自云南。

《Flora of China》 Vol. 22 (2006)
Helictotrichon delavayi  (Hackel) Henrard
云南异燕麦   yun nan yi yan mai
Avena delavayi Hackel, Oesterr. Bot. Z. 52: 189. 1902.
Perennial. Culms erect, slender, 35–50 cm tall, 2–3-noded. Leaf sheaths tight, shorter than internodes, puberulous near margins, otherwise glabrous; leaf blades narrowly linear, flat or margins involute, stiff, 6–11 cm, 1.5–2 mm wide, abaxial surface of lower blades pubescent, both surfaces scabrid, apex acute; ligule truncate, 1.5–2 mm. Panicle ovate-oblong in outline, 5–10 cm, slightly nodding; branches usually paired, lower ca. 6 cm, scabrid, bearing 2–4 spikelets in distal part. Spikelets 0.8–1 cm, green variegated yellow and purple, florets 3–4; rachilla shortly bearded; lower glume 5.5–7 mm, 1-veined, upper glume 7–8 mm, 3-veined; lemmas firm with scarious apex, lowest 7.5–9 mm, 5-veined, scaberulous, apex 2-toothed, teeth acuminate-mucronate; awn 1.3–1.5 cm, geniculate with twisted column, terete; palea slightly shorter than lemma, keels ciliolate. Anthers 2–2.5 mm. Fl. and fr. Jun–Aug.
* Montane meadows, forests; 2100–3700 m. Shaanxi, Sichuan, Yunnan.
This is a small, narrow-leaved variant from the Helictotrichon junghuhnii complex.