Hymenachne P.Beauv.

Marsh grass (en)

Genus

Angiosperms > Poales > Poaceae

Characteristics

Aquatic perennials. Culms long, decumbent, spongy, rooting at lower nodes, internodes solid, filled with aerenchyma. Leaf blades linear or broadly linear. Inflorescence usually a cylindrical spikelike panicle, rarely with spreading primary branches. Spikelets lanceolate, dorsally compressed, veins prominent, florets 2; lower glume usually about 1/3 spikelet length, base clasping; upper glume shorter than or subequaling spikelet, 5-veined; lower lemma as long as spikelet, 5-veined, apex acute to shortly awned; lower palea absent or much reduced; upper lemma membranous, rarely thinly cartilaginous, smooth, margins hyaline, gripping edges of palea below but free toward apex, apex acute.
More
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.
Life form perennial
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Sexuality hermaphrodite
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Hardiness (USDA) 9-12

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Cultivation

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