Dichanthium 雙花草屬
型態特徵
Perennials; culms compressed, glabrous or peduncle of inflorescence hairy apically. Leaves tubercle-based hairy, sheaths keeled, nodes glabrous or hairy; ligule truncate, ciliate; blade linear, with rather broad base, apex acute, margins revolute when dry. Inflorescence of 1-several approximate, dense, spike-like racemes, rachis many-jointed, articulate, dorsally compressed, imbricate, spikelets in alternate paris; one pair of pedicelate spikelets. Sessile spikelets: lower glume herbaceous, as long as spikelet, several-nerved, dorsally flat with narrowly inflexed hyaline margins, and continuous wings along edges; upper glume equally as long or slightly shorter, narrower, thin, boat shaped, keeled, apex narrowed and margins incurved; lower lemma shorter than lower glume, thinly membranaceous, nerveless; lower palea wanting; upper lemma consisting of an awn with a hyaline, stipe-like base, column nearly glabrous; upper palea wanting; lodicules 2, cuneate, apex rounded-truncate, glabrous; stamens 3 or reduced to staminodes; styles 2, free, stigmas usually laterally exserted. Caryopsis oblong to ovate, with a flat ventral side and a convex dorsal side. Pedicelate spikelets with lower glume like bisexual spikelets, membranaceous; upper lemma oblong-lanceolate, nerveless; stamens 0-3, anthers linear.
About 15 species in the paleotropics; two naturalized species in Taiwan.
