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

1. Elytrigia repens (Linnaeus) Desvaux ex B. D. Jackson, Index Kew. 1: 836. 1893.

偃麦草 yan mai cao

Plants with long rhizomes. Culms not tufted, green, glaucous, or purplish green, 40–80 cm tall, 3–5-noded, smooth. Leaf sheath smooth, glabrous but pilose at base; ligule ca. 0.5 mm; leaf blade flat, 10–20 × 0.5–1 cm, abaxial surface smooth, adaxial surface scabrous or pilose. Spike erect, 10–18 × 0.8–1.5 cm; rachis smooth but margin hispidulous; internodes 10–15 (–30) mm. Spikelets 10–18 × 6–10 mm, with 5–7(–10) florets, glabrous. Glumes subequal, 4–15 mm, 5–7-veined, smooth, glabrous, margin membranous, apex with point 1–2 mm or awn 4–8 mm. Lemma oblong-lanceolate, 6–12 mm, apex acuminate or with awn to 2 mm or 4–8 mm. Palea slightly shorter than lemma, ciliolate along keels. Anthers yellow, ca. 5 mm. Fl. and fr. Jun–Sep.

Valleys, grasslands, pastures, meadows, field margins, waste places; 500–1900 m. Gansu, Hebei, Heilongjiang, Nei Mongol, Qinghai, Shandong, Sichuan, Xinjiang, Xizang, Yunnan [India, Japan, Korea, Mongolia, Russia; C and SW Asia, Europe; introduced in North America].

This species is one of the world's most valuable range grasses.

1 Glumes 4–8 mm; lemma 6–10 mm.   1c subsp. elongatiformis
+ Glumes 10–15 mm; lemma ca. 12 mm   (2)
2 (1) Glume and lemma apex both with awn 4–8 mm.   1b subsp. longearistata
+ Glume apex usually with point 1–2 mm; lemma apex acuminate or with awn to 2 mm.   1a subsp. repens


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