光鞘披碱草 guang qiao pi jian cao

Agropyron curvatum Nevski, Izv. Bot. Sada Akad. Nauk SSSR 30: 629. 1932; Elymus curvatus (Nevski) D. F. Cui (1996), not Piper (1903); Roegneria curvata (Nevski) Nevski; R. fedtschenkoi (Tzvelev) N. R. Cui, nom. superfl.

Culms erect or slightly geniculate at base, robust, 50–100 cm tall. Leaf sheath smooth, glabrous, rarely pilose at base; leaf blade 0.5–1.2 cm wide, glabrous, scabrous, or adaxial surface laxly pilose. Spike erect or slightly curved, often somewhat secund, dense, 7–16 cm. Spikelets 1 per node, subsessile, green or greenish tawny-purple, 15.5–25 mm excluding awns, with 5 or 6 florets. Glumes broadly lanceolate, 11–18 × 2.3–3.5 mm, 5–7-veined, margin membranous, apex acuminate, pointed, sometimes with a tooth. Lemma lanceolate, 10–14 mm, scabrous or appressed setose; awn reflexed, 25–37 mm. Palea lanceolate, 9–13 mm, hispid along keels, apex subobtuse. Anthers 2.5–3 mm. Fl. and fr. Jun–Jul. 2n = 28*.

Mountain meadows. Xinjiang [Afghanistan, Kazakhstan, Kyrgyzstan, Pakistan, Russia, Turkmenistan, Uzbekistan].