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107. Eremopyrum (Ledebour) Jaubert & Spach, Ann. Sci. Nat., Bot., sér. 3. 14: 360. 1851.

旱麦草属 han mai cao shu

Triticum [unranked] Eremopyrum Ledebour, Fl. Altaic. 1: 112. 1829.

Plants annual. Culms erect or geniculate-ascending. Leaf sheath split to base; leaf blade usually flat. Spike ellipsoid-ovoid or cylindric-ovoid, very dense; rachis short, disarticulating at nodes. Spikelets 1 per node, held at nearly 90° to rachis, sessile, laterally compressed, with 3–6 florets; rachilla somewhat scabrous or shortly pilose, with or without joints below each floret. Glumes boat-shaped, leathery, with prominent keel, margin somewhat thickened, ultimately subhorny. Lemma leathery, 5-veined, 1-keeled, apex pointed or shortly awned; callus very short. Palea usually almost 2/3 as long as lemma, scabrous or pilose along keels. Lodicules ciliate at margin. Caryopsis somewhat adherent to lemma and palea. x = 7.

About eight species: from N Africa and the Mediterranean region to the W Himalayas; four species in China.

All species are valuable fodder plants for ephemeral spring pastures.

1 Spikelets glabrous or scabrous   (2)
+ Spikelets villous or hairy   (3)
2 (1) Spikelets 12–15 mm; leaf sheath not inflated on upper leaves, or slightly dilated on uppermost leaf.   3 E. bonaepartis
+ Spikelets 6–10 mm; leaf sheath inflated on upper leaves.   4 E. triticeum
3 (1) Spikelets 9–14 mm; glumes linear-lanceolate; lemma pubescent; palea keels prolonged into 2 short, blunt teeth; leaf sheath slightly inflated on upper leaves.   1 E. orientale
+ Spikelets 13–17 mm; glumes linear; lemma long villous; palea keels prolonged into 2 awned teeth 0.5–1.5 mm; leaf sheath slightly dilated but not inflated on uppermost leaf.   2 E. distans

Lower Taxa


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