Acroceras tonkinense (Balansa) C. E. Hubb. ex Bor

This is a more robust species than Acroceras munroanum, with larger leaves and harshly scabrous leaf margins and inflorescence.

Perennial. Culms up to 100 cm tall, nodes densely pubescent with soft white hairs. Leaf sheaths glabrous or with tubercle-based hairs, one margin tuberculate-ciliate; leaf blades lanceolate, 10–20 × 1–3 cm, glabrous or abaxial surface pilose, margins thickened, pectinate-ciliate at base, scabrous, midvein prominent abaxially, apex narrowly acuminate; ligule ca. 1 mm, obtuse. Panicle open, 15–25 × 5–10 cm, axis and branches stiff, scabrous; racemes ascending, with secondary branching; spikelets widely spaced, paired or single in upper part. Spikelets 5–5.5 mm; lower glume broadly elliptic, 3/4 spikelet length, 5-veined; upper glume and lower lemma as long as spikelet, 5-veined, apex slightly thickened; lower palea hyaline, narrow; upper lemma smooth, shining, slightly shorter than spikelet, apex thickened and protruding. Fl. and fr. Aug–Oct.

Moist places in forest shade. Hainan, Yunnan [India, Indonesia, Laos, Malaysia, Myanmar, Thailand, Vietnam].

Panicum tonkinense Balansa, J. Bot. (Morot) 4: 140. 1890; Neohusnotia tonkinensis (Balansa) A. Camus.