Annual grass, 50-130cm tall, up to 5m long in deep-water rices, forming small tufts;roots fibrous, arising from the base of shoots; stem erect to ascending, glabrous,composed of a series of nodes and internodes; leaves in two ranks; ligule triangular tolinear-lanceolate; auricles often present; inflorescence a terminal panicle, 9-40cm longwith 50-500 spikelets; fruit often whitish-yellow or brown to fuscous. (Philippines)