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FOC | Family List | FOC Vol. 22 | Poaceae

127. Orinus Hitchcock, J. Wash. Acad. Sci. 23: 136. 1933.

固沙草属 gu sha cao shu

Authors: Shou-liang Chen & Sylvia M. Phillips

Perennials, with long scaly rhizomes. Leaf blades linear to involute, with setiform slightly pungent apex; ligule membranous. Inflorescence a sparse panicle of few to several ascending racemose branches along a central axis. Spikelets shortly pedicelled, laterally compressed, florets (1 or)2 to several, rachilla disarticulating above glumes and between florets; glumes thin, lower 1-veined, upper 3-veined, acute to obtuse; lemmas lanceolate-oblong, 3-veined, pilose, lightly keeled, entire, acute or mucronate; palea equal to or slightly shorter than lemma, ± ciliolate along keels, ± hairy between keels. Caryopsis cylindrical.

Four species: Himalayas from Kashmir to Nepal and W China, at high altitudes; four species (three endemic) in China.

The widely spreading, scaly rhizomes are well adapted to survival in shifting sands, and the species are good stabilizers of dunes.

1 Lemmas pilose all over; leaf sheaths usually pilose   (2)
+ Lemmas pilose only along margins and lower keel; leaf sheaths usually glabrous   (3)
2 (1) Spikelets 5–6.5(–11) mm; florets 2–5.   1 O. thoroldii
+ Spikelets 8–11 mm; florets 5–8.   2 O. tibetica
3 (1) Spikelets 7–8.5 mm; florets 3–5; lemmas obviously pilose.   3 O. kokonorica
+ Spikelets 5–6 mm; florets 1–2; lemmas inconspicuously pilose.   4 O. anomala

Lower Taxa


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