三芒雀麦 san mang que mai

Boissiera danthoniae (Trinius) A. Braun; Bromus lanceo-latus Roth var. danthoniae (Trinius) Dinsmore; B. macro-stachys Desfontaines var. danthoniae (Trinius) Ascherson & Graebner; Triniusa danthoniae (Trinius) Steudel.

Annual. Culms erect or geniculately ascending, 30–50 cm tall, pubescent below inflorescence. Leaf sheaths pubescent; leaf blades 10–15 cm × 2–4 mm, both surfaces densely pubescent or later glabrescent. Panicle contracted or racemelike, dense, ovate in outline, 5–10 × 1–5 cm; branches and pedicels shorter than spikelets, ascending, scabrid. Spikelets oblong-lanceolate, 20–40 × 6–12 mm, florets 8–16, overlapping; rachilla internodes not visible; glumes broad, lower glume 5–8.5 mm, 3–5-veined, upper glume 7–9 mm, 7–9-veined; lemmas broadly elliptic, 9–12 mm, glabrous, pubescent or villous, 9–11-veined, veins scabrid, margins broadly membranous, broader and obtusely angled in upper half, apex lacerate, lowest lemmas shortly 1-awned, upper lemmas 3-awned from 2–4 mm below apex; central awn 15–25 mm, base flattened, twisted, recurved, lateral awns 4–10 mm, straight or recurved; palea shorter than lemma, keels ciliate. Anthers 1–1.8 mm. Fl. May–Aug.

Wastelands, dry grassy places on gravel slopes; 1500–3000 m. W Xizang [Afghanistan, NW India, Kazakhstan, Kyrgyzstan, Pakistan, Russia, Tajikistan, Turkmenistan, Uzbekistan; SW Asia, Mediterranean (Cyprus)].

Bromus danthoniae has been placed in B. sect. Triniusia (Steudel) Nevski. However, the available molecular data indicate that the species is nested within B. sect. Bromus.