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(Last Modified On 10/18/2012)
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(Last Modified On 10/18/2012)
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Genus
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HYMENACHNE
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PlaceOfPublication
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Ess. Agrost. 48. pl. IO. f. 8. 1812.
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Description
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Spikelets acuminate, short-pedicellate in dense spike-like or interrupted pan- icles; first glume acute or acuminate, 3- to 5-nerved, one-third to half as long as the spikelet, remote, a distinct stipe below the second glume; second glume and sterile lemma exceeding the fruit, 5-nerved, acuminate, the lemma longer than the glume, the tip awn-like; fruit membranaceous, pale, the margins of the lemma not inrolled, the tip of the palea not enclosed.
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Note
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Coarse aquatic perennials with long, broad, cordate clasping blades and long, spike-like or open panicles with spreading densely flowered branches.
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Key
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a. Panicles spike-like, dense; spikelets 3-4 mm. long, the second glume and sterile lemma rather prominently scabrous on the nerves - 1. H. AMPLEXICAULIS aa. Panicles not spike-like, the branches ascending to spreading, the lower ones 5-10 cm. long; spikelets 2-2.5 mm. long, the second glume and sterile lemma scabrous only on the midnerve - --2. H. DONACIFOLIA
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