Description from Flora of China
Calamagrostis staintonii G. Singh.
Perennial, loosely tufted, shortly rhizomatous. Culms 50–90 cm tall, 2–3 mm in diam., smooth, unbranched, 3–4-noded. Leaf sheaths smooth; leaf blades usually involute, ca. 25 cm, 2–5 mm wide, both surfaces glabrous, smooth or sometimes scabrid on margin; ligule 3–5(–7) mm, obtuse or subacute. Panicle open, 10–18 × ca. 12 cm; branches ascending or spreading, lowermost whorled, 4–8 cm, smooth, bare below middle. Spikelets 3.5–4.5 mm, greenish or yellowish green tipped with purple; glumes lanceolate, lower glume 1-veined, upper glume 3-veined, scabrid, apex acute or abruptly acuminate; callus hairs about as long as lemma; lemma 2.5–3 mm, scabrid, apex 4-toothed; awn arising from upper 1/5–1/4 of lemma, well exserted from spikelet, 3–6 mm, very slightly bent; palea ca. 2/3 as long as lemma; rachilla 1–1.5 mm, including hairs 2.5–3 mm. Anthers ca. 2 mm. Fl. Jul–Aug.
Calamagrostis staintonii is the correct name for this species in Calamagrostis because the heterotypic name C. nepalensis Nees ex Steudel already exists.
Dry slopes; 3100–3500 m. Sichuan, Yunnan [Nepal].