Pseudoraphis spinescens (R. Br.) Vickery

Stem floating on water, nodes pubescent. Blade lanceolate-linear, 3-6 cm long, 2-4 cm wide, with a petiole of ca. 1 mm long, membranaceous, erose. Panicle 6-14 cm long, branches stiff, extending beyond spikelet into a bristle of 6-10 mm long. Spikelets hispid, lanceolate, 5-7 mm long, solitary on pedicel of ca. 0.5 mm long; lower glume truncate or rounded, hyaline, ca. 0.5 mm long; upper glume 5- 7 mm long, acuminate, hispid on veins; lower lemma slightly shorter than upper glume, veins ca. 13, obscure, acuminate, enclosing a lower palea and a staminate flower; upper lemma pistillate 1.6-1.8 mm long, membranaceous; anther ca.1 mm long. Caryopsis much exceeding upper floret when mature.

India, Sri Lanka, Myanmar. Indochina, Malesia, northern Australia, China and Japan. Taiwan, growing in shallow water or floating on deep water.

Panicum spinescens R. Br. Prod. Fl. Nov. Holl. 193. 1810.