Plants annual. Culms to 100 cm; nodes hispid, hairs appressed.
Sheaths glabrous or pilose, margins ciliate distally; ligules about
1 mm, ciliate; blades 15-30 cm long, 4-7 mm wide, flat, scabrous or pubescent.
Panicles 3-15 cm, densely spicate; rachises rough hispid and sparsely
villous; bristles 1-3, 5-15 mm, flexible, antrorsely scabrous. Spikelets
about 2 mm, turgid. Lower glumes 1/3-1/2 as long as the spikelets, 3-5-veined;
upper glumes about 3/4 as long as the upper lemmas, 5-7-veined; lower
lemmas equaling the upper lemmas; lower paleas 3/4 as long as the lower
lemmas, hyaline; upper lemmas very coarsely and transversely rugose; upper
paleas similar to the upper lemmas. 2n = unknown.
Setaria corrugata grows in pinelands and cultivated fields along
the southeastern coast of the United States. It is also found in Cuba
and the Dominican Republic. Superficially, it resembles S.
viridis, but is
easily distinguished from that species by its coarsely rugose (corrugated)