Cenchrus brownii Roem. & Schult.

Annual; culms erect to decumbent-spreading and rooting at the lower nodes, simple to freely branching; sheaths mostly longer than the internodes, compressed, keeled, glabrous; ligule ciliate, less than 1 mm. long; blades 10-30 cm. long, mostly 6-8 mm., or sometimes as much as 12 mm. wide, scabrous to nearly glabrous; spikes 4-10 cm. long, dense, the axis minutely scabrous or pubescent; burs about 4 mm. wide, subtended by a ring of slender irreg-ular bristles, the lobes pubescent, interlock-ing; spikelets usually 3 in each bur, 4-4.5 mm. long; first glume obsolete; second glume two-thirds to three-fourths as long as the subequal sterile lemma and fruit; fruit acuminate, minutely roughened, the nerves evident near the tip.