Calamagrostis borii Tzvelev.

Perennial, tufted, rhizomatous; rhizomes elongate, slender. Culms erect, 25–35 cm tall, smooth, 2–3-noded. Leaf sheaths smooth or scabrid at base; leaf blades flat, 4–8 cm, 3–4.5 mm wide, scabrid; ligule 3–7 mm. Panicle dense, spikelike, narrowly oblong in outline, 6–9 × 1.5–2 cm; branches erect, appressed, scabrid. Spikelets 4.5–6(–7) mm, rose or purplish red; glumes lanceolate, subequal, lower glume 1-veined, upper glume 3-veined, smooth or scabrid only along keel, apex sharply acuminate; callus hairs 1/3–1/2 length of lemma; lemma 4–5 mm, membranous, upper part scabrid, apex obtuse or denticulate; awn arising from or a little below middle of lemma, straight or slightly geniculate, 5–6 mm; palea ca. 3/4 as long as lemma; rachilla conspicuously penicillate, 1.5–2 mm, including hairs 4–5 mm. Anthers 2–2.5 mm. Fl. and fr. Jul–Sep.

This species is very close to Deyeuxia pulchella, but has a more compact panicle and an awn arising lower down the lemma back.

* Alpine meadows, grassy mountainsides; 3500–5000 m. W Sichuan, Xizang.