Perennials or annuals; culms mostly prostrate, sometimes scrambling, with erect flowering shoots.
Inflorescence an open or contracted panicle and often branched from all sides. Spikelets pedicelate, falling
as a whole, small, strongly laterally compressed, strongly convex on one narrow side, hence oblique
and trigonous, unawned, 2-flowered; glumes and lower lemma herbaceous, veins very prominent; upper
lemma and palea indurate at maturity; rachilla not produced; lower glume much shorter than spikelet, 3-
veined; upper glume larger, strongly convex, 3-veined; lower lemma, as long as spikelet, slightly convex,
5-veined; lower palea small or 0; upper lemma distinctly sparated from lower lemma, boat shaped,
coriaceous, smooth and glossy, glabrous, with narrowly inrolled, opaque margins; upper palea with margins
incurved; lodicules 2; stamens 3; style 2, free, stigmas plumose, exserted laterally. Caryopsis free.
Eleven species, distributed in the tropical regions of the Old World; two species in Taiwan.