Acroceras diffusum L. C. Chia, Fl. Hainan. 4: 538. 1977.

Culms 0.6–1 m tall. Leaf sheaths shorter than internodes, compressed, keeled, one margin ciliate; leaf blades 10–15 × 1–1.3 cm, both surfaces glabrous, base slightly rounded, margins thickened and repand, midvein obscure with transverse veinlets. apex acuminate; ligule ca. 0.5 mm. Panicle lax, ca. 15 × 9 cm, branches 7–10, with slender branchlets. Spikelets oblong, ca. 3.2 mm; lower glume ovate-lanceolate, ca. 2/3 spikelet length, 5–7-veined; upper glume and lower lemma similar, 9–11-veined; lower floret with an oblong membranous palea; upper lemma glabrous, shining. Caryopsis ca. 1.7 mm. Fl. and fr. Sep–Oct.

* Moist places in forests. Hainan.