13. Elymus cacuminis B. Rong Lu & B. Salomon, Nordic J. Bot. 13: 355. 1993 [“cacuminus”].
峰峦披碱草 feng luan pi jian cao
Roegneria cacuminis (B. Rong Lu & B. Salomon) L. B. Cai.
Culms tufted at base, erect or geniculately ascending, 25–57 cm tall, (2 or)3(or 4)-noded, glabrous, or sparsely scabrous below spike. Leaf sheath grayish or purplish, usually hairy at base, smooth distally; ligule to 0.5 mm; auricles pale green, brown, or purple; leaf blade light green to purplish, linear, tightly involute or with involute margin, rarely flat, 2–15 × 0.1–0.6 cm, abaxial surface scabrous, adaxial surface ± pubescent. Spike strongly nodding at flowering, secund or distichous, dense or lax, 4–13 × 0.8–1.2 cm; rachis scabrous on back and margin. Spikelets 1 per node, green or purple, 25–40 × 2.5–4.5 mm, with 3–6 florets; pedicel 5–9 mm. Glumes ovate or narrowly lanceolate, glabrous abaxially, scabrous along veins, margin thin, apex mucronate; proximal glume 2–6 × 0.5–1.4 mm, (1 or)2–5-veined; distal glume (2.5–)3–9 × 0.8–1.5 mm, 3–5(–7)-veined. Lemma narrowly lanceolate-elliptic, 8–11 × 1.2–2 mm, scabrous to sparsely pubescent abaxially; callus narrow ± setulose; awn strongly curved at maturity, 1.5–3 cm. Palea slightly shorter than lemma, glabrous to sparsely pubescent adaxially, ciliate along keels. Anthers yellow or purple, 1.3–2 mm. Fl. and fr. Jul–Sep. 2n = 28*.
Dry scrub, stony mountain slopes, rocky river banks, streams in valleys; 4300–5000 m. Sichuan, Xizang [India (Sikkim), Nepal].