大丛披碱草 da cong pi jian cao

Roegneria magnicaespes (D. F. Cui) L. B. Cai.

Plants without rhizome. Culms tufted, erect, 50–70 cm tall, 2-noded. Leaf sheath glabrous, usually fibrous and broken at base; ligule ca. 5 mm, membranous, apex truncate; leaf blade setaceous, involute, 6–15 × 0.15–0.25 cm, stiff, abaxial surface glabrous, adaxial surface scabrous. Spike erect, slender, 8–12 cm; rachis scabrous, margin ciliolate; internodes ca. 10 mm. Spikelets 1 per node, 11–18 × 2–3 mm, with 4–6 florets; rachilla densely puberulent; internodes ca. 1.5 mm. Glumes oblong-lanceolate, 4- or 5-veined, margin membranous, apex acuminate or pointed; proximal glume 3–6 mm, distal glume 6–9 mm. Lemma oblong-lanceolate, smooth, glabrous, apex acuminate; first lemma ca. 10 mm. Palea equaling lemma, narrowed toward subtruncate apex, ciliolate along keels. Anthers ca. 3 mm. Fl. and fr. Jul–Aug. 2n = 28*.

* Steppes; ca. 2100 m. Xinjiang.