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99. Psathyrostachys Nevski in Komarov, Fl. URSS. 2: 712. 1934.

新麦草属 xin mai cao shu

Plants perennial, densely tufted, or laxly tufted with underground rhizomes. Culms usually erect. Leaf blade flat or rolled. Spike linear, oblong, or ovate; rachis fragile, readily disarticulating between spikelets. Spikelets in groups of 2 or 3, sessile, compressed, with 1 or 2(or 3) florets, usually with rudimentary florets. Glumes subulate-setiform, awnlike, inconspicuously 1-veined, not keeled, margin entire. Lemma lanceolate, broadly rounded abaxially, not keeled, 5–7-veined, apex acuminate to awned. Palea equaling or slightly longer than lemma, 2-keeled. Caryopsis tightly enclosed in lemma and palea at maturity, oblong, apex hairy. x = 7.

Nine species: steppes and semidesert regions from W Russia and Turkey eastward to Afghanistan and Siberia; cultivated in North America; five species (two endemic) in China.

All species of this genus are good fodder plants.

1 Plants laxly tufted, with underground rhizomes   (2)
+ Plants usually densely tufted, without underground rhizomes   (3)
2 (1) Glumes scabrous; lemma glabrous to sparsely scabrous.   1 P. huashanica
+ Glumes pilose in proximal half, scabrous in distal half; lemma sparsely pilose.   2 P. stoloniformis
3 (1) Anthers violet, 5–5.6 mm.   4 P. kronenburgii
+ Anthers usually yellow, 3–5 mm   (4)
4 (3) Glumes densely hirsute, hairs 0.5–1.3 mm.   3 P. lanuginosa
+ Glumes scabrous or puberulent only proximally and distally.   5 P. juncea

Lower Taxa


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