Culms (15)25-110 cm, more or less erect, often branching from the aerial nodes. Blades usually densely scabrous on both surfaces, not exceeding the panicle. Panicles 10-57 cm long, (0.5)3-18 cm wide, often ellipsoidal, usually completely exserted from the uppermost leaf sheaths; branches 2-11 cm, mostly ascending. Spikelets 5-10 mm. Lower glumes 1-2.6 mm, narrowly triangular to ovate; upper glumes 1.8-2.8 mm, obovate to widely obovate; lemmas 2-3.6 mm, light brown, dark green, or lead-colored, usually without a basal dark spot, apices usually truncate or obtuse, rarely broadly acute, sometimes bifid, sometimes mucronate; anthers 3, 0.2-0.6(1) mm. Caryopses 1-1.5 mm.
Diplachne fusca subsp. uninervia is native from the southern United States to Argentina. It may be confused with Dinebra scabra from which it usually differs in its truncate or obtuse lemmas.