新疆落芒草 xin jiang luo mang cao

Urachne songarica Trinius & Ruprecht, Sp. Gram. Stipac. 15. 1842; Oryzopsis songarica (Trinius & Ruprecht) B. Fedtschenko; O. tianschanica Drobow & Vvedensky; Piptatherum songaricum subsp. tianschanicum (Drobow & Vvedensky) velev.

Perennial, densely tufted from a short rhizome. Culms (25–)30–60(–100) cm tall, 2–4-noded. Leaf sheaths glabrous, shorter than internodes; leaf blades flat or loosely rolled, 5–20 cm, 2–4 mm wide, abaxial surface scaberulous toward apex, adaxial surface glabrous or puberulous; ligule lanceolate, 5–8 mm. Panicle lax, 10–20(–30) cm; branches (1–)2 per node, slender, ascending, sinuous or sometimes nodding, longest 1/2–2/3 panicle length, scabrid at least in upper part, spikelets clustered toward apices. Spikelets green or gray-brown; glumes broadly lanceolate, 6–10 mm, membranous except at base, scabrid, apex acuminate; callus glabrous; lemma ovate, 3–5.2 mm, pubescent above middle, glabrous below except for small tufts at basal margins, glabrescent along midline at maturity, apex acute; awn caducous, 5–8 mm. Anthers 1.5–2 mm, bearded at apex. Fl. and fr. Jun–Aug.

Rocky moist places on mountain slopes; 1000–1900 m. Xinjiang [Kazakhstan, W Mongolia, Russia].