8. Panicum luzonense J. Presl in C. Presl, Reliq. Haenk. 1: 308. 1830.
大罗湾草 da luo wan cao
Panicum cambogiense Balansa; P. cruciabile Chase.
Annual, tufted, hispid. Culms erect or geniculately ascending, 30–150 cm tall, nodes bearded. Leaves cauline; leaf sheaths loose; leaf blades linear to linear-lanceolate, flat, 5–20(–40) × 0.5–1.5 cm, base cordate, margins scabrid, apex acute; ligule ciliate. Panicles terminal and axillary, ovate to oblong in outline, 10–30(–50) cm, moderately branched with the spikelets evenly spread throughout the panicle, branches scabrid. Spikelets elliptic to obovate, somewhat plump, 2–2.5 mm, glabrous; lower glume broadly ovate, 1/3–1/2 length of spikelet, 5–7-veined, acute, separated by an internode; upper glume ovate, as long as spikelet, 9–11-veined, transverse veins present, acute; lower lemma similar to upper glume, palea well developed but floret barren; upper floret elliptic, yellow, smooth, shiny. Fl. and fr. Aug–Oct. 2n = 18.
Fields, forest margins. Guangdong, Guangxi, Hainan, Taiwan, Yunnan [India, Indonesia, Myanmar, Philippines, Sri Lanka; Australia].