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

6. Hordeum spontaneum K. Koch, Linnaea. 21: 430. 1848.

钝稃野大麦 dun fu ye da mai

Plants annual. Culms 40–50 cm tall, 5- or 6-noded, glabrous. Leaf sheath glabrous; ligule yellowish brown, ca. 1 mm, apex truncate; auricles present, 2–3 mm; leaf blade 5–10 × 0.4–0.6 cm. Spike distichous, greenish to dark brown, slightly compressed, 4–6 × ca. 1 cm; rachis ca. 3 mm, brittle, densely pubescent. Lateral spikelets: pedicellate, sterile; pedicel ca. 2 mm; lemma apex rounded-obtuse, cuspidate, very shortly awned, or with awn 6–10 mm. Central spikelets: sessile, 1–1.4 cm; glumes linear-lanceolate, densely hairy, apex tapering into slender, scabrous awn; lemma broadly elliptic, glabrous, apex prolonged into flat, very scabrous awn 5–17 cm. Fl. and fr. Apr–Jun.

Thickets, stony screes, pebbles, roadsides, waste places, often as a weed in cultivated fields of Hordeum and other crops; 3500–4000 m. Sichuan, Xizang, Yunnan [Afghanistan, India, Kazakhstan, Kyrgyzstan, Pakistan, Russia, Turkmenistan, Uzbekistan; NE Africa, SW Asia].

1 Apex of lemma of lateral spikelets rounded-obtuse.   6a var. spontaneum
+ Apex of lemma of lateral spikelets cuspidate or awned   (2)
2 (1) Apex of lemma of lateral spikelets cuspidate or with very short awn.   6b var. proskowetzii
+ Apex of lemma of lateral spikelets with awn 6–10 mm.   6c var. ischnatherum


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