科名：禾本科 Gramineae

属名：三芒草属 Aristida

《中国植物志》第10(1)卷116页
  6. 高原三芒草（西藏植物志）图版36：4-5
  Aristida alpina L. Liou. 西藏植物志5: 82. 1987.
  多年生。须根密而细长，柔韧。秆直立，上部暗灰色，紧密丛生，平滑无毛，高15-25厘米，顶节位于秆基部为叶鞘所包藏。叶鞘紧密包茎，平滑，鞘口具长约2毫米的柔毛；叶舌短，具纤毛；叶片纵卷或稀扁平，灰绿色，上面粗糙，下面平滑，长4-18厘米，宽1-3毫米。圆锥花序狭窄，长4-10厘米，分枝2枚，粗糙，贴向主轴，长2-5厘米；小穗柄长2-5毫米，粗糙，小穗暗紫色或古铜色；两颖近等长，披针形，长12-13毫米，具1脉，脉上及背上部粗糙，顶端具短尖；外稃长约9毫米，背上部粗糙，暗紫色，基盘较钝圆，长约0.5毫米，具长约0.8毫米的短毛，芒微粗糙，主芒长8-9毫米，两侧芒长4-6毫米；内稃长约2毫米，椭圆形，具2脉；鳞被2，薄膜质，长圆形，长约2毫米；花药长约3毫米。花果期夏秋季。
  产我国西藏；多生于海拔4 500米的干山坡。模式标本采自西藏拉萨。

《Flora of China》 Vol. 22 (2006)
Aristida alpina  L. Liu
高原三芒草   gao yuan san mang cao
Perennial forming small tough tussocks. Culms erect, 15–25 cm tall, unbranched, upper part dark-gray, terminal node usually included in uppermost leaf sheath. Leaf sheaths glabrous, pilose at mouth (hairs ca. 2 mm), tightly overlapping; leaf blades gray-green, involute or rarely flat, 4–18 cm, abaxial surface smooth, adaxial surface scabrid. Panicle narrow, 4–10 cm; branches 2–5 cm, appressed to main axis. Spikelets dark-purple or brown; glumes subequal with upper slightly longer, 1.2–1.3 cm, lanceolate, 1-veined, scabrid on upper part and vein, apiculate; callus ca. 0.5 mm, bearded with ca. 0.8 mm hairs, obtuse; lemma ca. 9 mm, dark purple, scabrid in upper part, awns arising directly from lemma apex; central awn 8–9 mm, lateral awns 4–6 mm. Anthers ca. 3 mm. Fl. and fr. summer and autumn.
* Dry mountain slopes; ca. 4500 m. Xizang.
This species is very similar to Aristida triseta, but with somewhat larger spikelet parts.