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FOC | Family List | FOC Vol. 22 | Poaceae

157. Hymenachne P. Beauvois, Ess. Agrostogr. 48. 1812.

膜稃草属 mo fu cao shu

Authors: Shou-liang Chen & Sylvia M. Phillips

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.

Five species: tropics of the Old World and New World; three species (one endemic) in China.

Hymenachne is a genus of swamp grasses similar to Sacciolepis, and both are segregates from the large genus Panicum. The culms of Sac-ciolepis are hollow, but in Hymenachne they are filled with aerenchyma.

1 Panicle open, up to 9 cm wide; spikelets loose; culm nodes villous.   1 H. patens
+ Panicle spikelike, 1–2 cm wide; spikelets dense; culm nodes glabrous   (2)
2 (1) Spikelets 4–6 mm; upper glume and lower lemma cuspidate-acuminate or extended into mucro up to 2 mm.   2 H. amplexicaulis
+ Spikelets 2–3.2 mm; upper glume and lower lemma acute to acuminate   (3)
3 (2) Spikelets 3–3.2 mm, lanceolate, acuminate.   3 H. assamica
+ Spikelets 2–2.5 mm, ovate-lanceolate, acute.   10 Panicum auritum (see p. 507)

Lower Taxa


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