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Taiwan Gramineae | Family List | Poaceae

Erianthus Michx., Fl. Bor.-Amer. 1:54. 1803.

蔗茅屬

Perennials; culms tufted, solid, nllea with pith; root-primodia present at base of nearly all internodes or only of basal ones, always in 1-row. Ligule well- developed, the collar not much developed; blades linear, flat, behind ligule with dense group of long, soft hairs, often extending upwards for some distance along the midnerve. Inflorescence an open panicle, branched on all sides. Spikelets in pairs, the one sessile, the other pedicelled, dorsally compressed, awned or muticous, the base hairy, the basal hairs shorter than spikelet. Pedicelled spikelets articulate with pedicel, falling off entirely. Sessile spikelets falling with adjacent rachis-internode and pedicel of other spikelet; glumes about as long as spikelet, acute, membranous, long-hairy at least in pedicellate spikelets, lower glume flat or slightly convex, margins incurved, 2-5-nerved; upper glume boat-shaped, 3-nerved; lateral nerves often obscure; lower lemma slightly shorter, acute, thinly membranous, 1-nerved; lower palea absent; upper lemma convex, apex 2-toothed or entire, slightly shorter than upper glume; l-nerved, with long or short awn or muticuous; upper palea shorter, nerveless; lodicules 2, small, cuneate, apex emarginate, glabrous; stamens 3, the anthers linear; ovary glabrous, the styles 2, free, the stigmas plumose, exserted laterally. Caryopsis oblong or linear-oblong, with a convex back and flat ventral side; embryo half as long as caryopsis.

About 28 species distributed in tropical America, Southeastern Europe to Eastern Asia, Indo-Malaysia and Polynesia, and with one species in the Sahara, and one in Madagascar.

Two species and one variety are found in Taiwan.


KEY TO THE SPECIES

1 Spikelets awnless, if awned, awn at least not exceeding the spikelet   Erianthus arundinaceus
+ Spikelets awned, awn well developed, far exceeding the spikelet   Erianthus formosanus

Lower Taxa


 

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