反折披碱草 fan zhe pi jian cao

Roegneria retroflexa (B. Rong Lu & B. Salomon) L. B. Cai.

Culms 55–75 cm tall, 3- or 4-noded, glabrous. Leaf sheath smooth; ligule 0.4–0.5 mm, apex lacerate; auricles 1–1.2 × 0.1–0.2 mm; leaf blade narrowly linear, 4–10 × 0.1–0.2 cm, scabrous. Spike nodding, lax, 6.5–12 × 0.5–1 cm; rachis smooth. Spikelets 1 per node, 4–6.5 × 2–5 mm, with 3–5 florets; rachilla pilose, 2.5–3 mm. Glumes narrowly elliptic, subequal, small, scabrous along veins, margin membranous, apex acute or mucronate; proximal glume (1.5–)2–5 × 0.5–1 mm, (2 or)3-veined; distal glume (3–)5–7.5 × 0.8–1.3 mm, 3–5-veined. Lemma narrowly lanceolate, 9–12 × 1–1.5 mm excluding awn; awn bent when mature, 3.5–5.5 cm. Palea narrowly lanceolate, 8–9 × 0.9–1.2 mm, ciliate along keels, apex truncate, hairy. Anthers yellow, 2.5–3 mm. Fl. and fr. Jul–Sep. 2n = 28*.

* Dry to moist mountain slopes and meadows usually with shrubs and Betula trees; 3900–4300 m. Xizang.