西伯利亚羊茅 xi bo li ya yang mao

Festuca albida (Turczaninow ex Trinius) Malyschev (1965), not Lowe (1831); Poa albida Turczaninow ex Trinius; Leucopoa albida (Turczaninow ex Trinius) V. I. Kreczetowicz & Bobrov; L. sibirica Grisebach, nom. illeg. superfl.

Plant dioecious, densely tufted; shoots extravaginal and intravaginal; basal sheaths light gray or brownish, becoming fibrous. Culms 22–40 cm tall, nodes 1(–2). Leaf sheaths glabrous; leaf blades flat or involute, 8–30 cm × 1.5–3 mm, margins smooth or scaberulous; adaxial to abaxial sclerenchyma strands present, abaxial sclerenchyma in narrow discrete strands; ligule 0.4–0.7 mm, margin ciliate. Panicle weakly spreading, 5–7 cm; branches 1–1.5 cm, scabrid, 2 at lowest node (the short branch with only one spikelet). Spikelets 6–8 mm, greenish or yellowish; florets 2–3; glumes membranous; lower glume lanceolate or broadly lanceolate, 3.5–4.8 mm; upper glume broadly lanceolate or ovate, 4–5.3 mm; rachilla internodes 0.5–0.7 mm; lemmas 5.8–6.5 mm, back asperulous; awns absent; palea keels scabrid. Anthers 3–3.5 mm long in male florets. Ovary apex densely hairy in female florets. 2n = 28. Fl. and fr. Jun.

Stony slopes, screes, among rocks, sometimes in sand. Nei Mongol, NE China [Mongolia, Russia].