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FOC | Family List | FOC Vol. 22 | Poaceae | Elymus

29. Elymus glaberrimus (Keng & S. L. Chen) S. L. Chen, Bull. Nanjing Bot. Gard. 1987: 9. 1988.

光穗披碱草 guang sui pi jian cao

Plants without rhizome, when culms tufted, or with short rhizome. Culms erect, glaucous, ca. 80 cm tall. Leaf sheath smooth and glabrous, or puberulent at base; leaf blade glaucous, flat, or involute when dry, 8–15 × (0.1–)0.3–0.4 cm, stiff, abaxial surface smooth, glabrous, adaxial surface scabrous. Spike erect, 5–12 cm, with 6–11 spikelets. Spikelets 1 per node, greenish, stramineous when old; rachilla smooth and glabrous, or puberulent. Glumes lucid, oblong-lanceolate, glabrous, margin membranous, apex acute with a tooth on one side; proximal glume 4–6 mm, 3-veined; distal glume 5.5–7.5 mm, 3–5-veined. Lemma oblong-lanceolate, smooth and glabrous throughout; first lemma ca. 9 mm; awn recurved, 3–20 mm, scabrous. Palea equaling lemma, smooth and glabrous abaxially distally or scabrous proximally, ciliolate along keels, apex emarginate or truncate. Fl. and fr. Aug–Sep. 2n = 28*.

* Meadows, mountain steppes, rocky slopes; 1400–2300 m. Qinghai, Xinjiang.

1 Lemma awn 10–20 mm; plants without rhizome.   29a var. glaberrimus
+ Lemma awn 3–5 mm; plants usually with short rhizome.   29b var. breviaristus


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