Description from Flora of China
Agrostis perlaxa Pilger; A. poluninii Bor; A. pubicallis Keng ex Y. C. Yang.
Perennial, tufted. Culms erect or slightly geniculate at base, up to 50 cm tall, 0.5–1.2 mm in diam., 2–4-noded. Leaf sheaths smooth; leaf blades very narrowly linear, flat, 5–10 cm × 0.5–2 mm, smooth except toward apex; ligule 2–3 mm, apex lacerate. Panicle very lax, ovate in outline, 7–20 cm, open at and after anthesis; branches 2–3 per node, whorls distant, widely ascending to divaricate, capillary, slightly flexuous, longest up to 9 cm, smooth or slightly scabrid, lower half bare. Spikelets 2.6–3.5 mm, usually violet tinged; glumes unequal, lower glume narrowly lanceolate, longer than upper, upper glume oblong-lanceolate, keel scabrid, apex acuminate; callus hairs ca. 0.2 mm; lemma 2/3 spikelet length, back smooth or scaberulous, awned from just above middle, apex truncate-denticulate; awn weakly geniculate, 2–4 mm; palea ca. 0.3 mm. Anthers 0.6–1 mm. Fl. and fr. Aug–Sep.
The spikelets of Agrostis hookeriana are similar to those of A. sozanensis, but in the former species the panicle is very open and broad, with divaricate branches, and the geographic distribution is more westerly.
Montane forests, among bushes, ditches, damp places; 1900–3600 m. Qinghai, W Sichuan, Xizang, Yunnan [Bhutan, India (Sikkim), Nepal].