裸燕麦 luo yan mai

Avena sativa Linnaeus var. nuda (Linnaeus) Koernicke.

Annual. Culms 45–90 cm tall. Leaf blades up to 20 cm, 3–7 mm wide, scaberulous. Panicle somewhat contracted, up to 25 cm. Spikelets 1.8–2.5(–3.5) cm, florets 2–4, lower 1 or 2 florets awned, upper florets awnless; rachilla glabrous, not disarticulating at maturity, florets lacking a basal bearded callus; glumes lanceolate, subequal, conspicuously shorter than spikelet, 7–9-veined; lemmas 1.5–2 cm, papery, distinctly veined throughout, glabrous, awned from ca. upper 1/3, apex 2-toothed, teeth slenderly acuminate, up to 4 mm; awn 1.5–2 cm, bent but not twisted. Grain ca. 6 mm, free from lemma and palea at maturity (free threshing). 2n = 42.

Cultivated; 2300–3300 m. Hubei, C and N Yunnan [Russia; Europe].

This is a minor crop, seldom cultivated nowadays. It is used for flour and also for animal fodder. It is a European species, but has been recently recorded as cultivated in Yunnan.

The place of publication of this species is sometimes cited as Amoen. Acad. 3: 401. 1756. The Amoenitates Academicae are a collection of reissued Linnaean dissertations. Avena nuda was validly published in the original dissertation in 1753.