Annual; caespitose. Culms 15-60 cm long. Leaf-sheaths keeled; glabrous on surface, or pilose. Ligule a fringe of hairs; 0.2-0.6 mm long. Leaf-blades 4.5-17 cm long; 1.1-3.3 mm wide. Leaf-blade surface smooth, or scabrous.
Inflorescence a panicle. Panicle spiciform; linear; loose (internodes 4-10mm); 2-6.8 cm long; 0.8-1.9 cm wide. Primary panicle branches accrescent to a central axis; with sessile scars on axis. Panicle axis angular; scabrous; bearing deciduous spikelet clusters. Spikelets subtended by an involucre. Fertile spikelets sessile; 1-3 in the cluster. Involucre composed of bristles; connate into a cup below; ovate; 5.2-12.9 mm long; base obconical; base glabrous. Involucral bristles deciduous with the fertile spikelets; emerging irregularly from body of a burr; 3.2-6 mm long; flattened; rigid; retrorsely scaberulous; glabrous.