Description from Flora of China
Aristida vulgaris var. depressa (Retzius) Trinius & Ruprecht; Chaetaria depressa (Retzius) P. Beauvois.
Annual. Culms slender, erect or geniculate at base, 30–50 cm tall, branched. Leaf sheaths glabrous, shorter than internodes, loose; leaf blades involute, 4–15 cm, abaxial surface smooth, adaxial surface pubescent, apex finely pointed; ligule ca. 0.5 mm. Panicle lax and open or loosely contracted, 7–18 cm; branches filiform, 2–5 cm, ascending or slightly flexuously spreading, inserted singly or in small groups along main axis. Spikelets greenish or stramineous; glumes clearly unequal with upper longer, narrowly lanceolate, 1-veined, lower glume 4–4.7 mm, scabrid on vein and back, acuminate, upper glume 7–8 mm, smooth, emarginate to acute; callus 0.3–0.5 mm, obtuse; lemma linear, about as long as upper glume, 6.5–8 mm, laterally compressed, smooth or punctately scabrid, keel spinulose; awn arising directly from lemma apex, branches subequal, central branch 1.2–1.5 cm, laterals ca. 1 cm. Anthers 1.5–2 mm. Fl. Jul–Sep.
This is a variant from the Aristida adscensionis gene pool, in which species it is often included.
Grassy mountain slopes, river banks and roadsides; 700–1600 m. Sichuan, Yunnan [India, Myanmar, Sri Lanka, Thailand].