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173. Stenotaphrum Trinius, Fund. Agrost. 175. 1822 [“1820”].
钝叶草属 dun ye cao shu
Authors: Shou-liang Chen & Sylvia M. Phillips
Diastemenanthe Steudel; Ophiurinella Desvaux.
Annuals or perennials, stoloniferous. Leaf blades linear to narrowly lanceolate; ligule ciliate. Inflorescence of very short racemes bearing a few sessile spikelets; racemes arranged singly and sunk in pockets on one or both sides of a foliaceous or corky axis, variously disarticulating at maturity, raceme rachis ending in a point. Spikelets ovate-lanceolate to lanceolate; glumes both short or the upper equal to spikelet, membranous; lower floret staminate or neuter, lemma as long as the spikelet, usually coriaceous, rarely papery, smooth, acute; upper lemma slightly shorter than lower lemma, papery, rarely coriaceous, margins flat. x = 9.
Seven species: tropics and subtropics, mostly on seashores or near the coast from the Indian Ocean to SE Asia and the Pacific Ocean, one species pantropical; three species (one introduced) in China.
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| 1 |
Inflorescence with broad foliaceous axis, spikelets not sunk in axis cavities; lower lemma herbaceous, upper lemma coriaceous. |
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1 S. helferi |
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Inflorescence with thick, non-foliaceous axis, spikelets sunk in axis cavities; lower lemma cartilaginous, upper lemma papery |
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(2) |
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| 2 (1) |
Spikelets on opposite sides of a cylindrical axis, 2.5–3.5 mm, in short racemes; leaf blades sharply acuminate. |
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2 S. micranthum |
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Spikelets on one face of a flattened axis, 4–5 mm, solitary; leaf blades obtuse. |
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3 S. secundatum |
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Lower Taxa
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