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

47. Elymus mutabilis (Drobow) Tzvelev, Rast. Tsentr. Azii. 4: 217. 1968.

狭颖披碱草 xia ying pi jian cao

Plants ± with rhizome, or if without rhizome then culms tufted. Culms erect, 60–120 cm tall. Leaf blade flat, 10–20 × 0.4–0.7 cm, glabrous. Spike usually dense, 6–20 × 0.4–0.7 cm; rachis margin ciliate; internodes 9–15 mm. Spikelets 1 per node, green, purple, glaucous, or purplish glaucous, 10–20 mm, with 2–5 florets; very shortly pedicellate. Glumes lanceolate or broadly so, 7–13 × 1.5–2 mm, 5-veined, scabrous or hispid, margin sometimes broadly membranous, apex acuminate to awned; awn (when present) 1–2 mm. Lemma narrowly elliptic, 8–9 mm, scabrous, ± pilose, or pubescent throughout; awn 1–7 mm. Palea equaling or subequaling lemma, margin ciliate, apex emarginate, truncate, or obtuse. Anthers 2–3 mm. Fl. and fr. Jun–Sep. 2n = 28*.

Sparse forests, forest margins and glades, among shrubs, mountain slopes, meadows, pebbles; 1200–2400 m. Xinjiang [Mongolia, Russia; C and SW Asia, Europe].

This species is a good forage grass.

1 Plants without rhizome (culms tufted); spikelets usually glaucous or purplish glaucous.   47c var. praecaespitosus
+ Plants ± with rhizome; spikelets purple or green   (2)
2 (1) Spikelets usually purple; glumes lanceolate; lemma ± pilose, awn 2–5 mm.   47a var. mutabilis
+ Spikelets usually green; glumes broadly lanceolate; lemma pubescent throughout, awn 1–2 mm.   47b var. nemoralis


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