GENERA OF GRASSES OF THE UNITED STATES. 
149 
Spokoboiats R. Br, 
Spikelets 1-flowered, the rachilla disarticulating above the glumes; 
glumes awnless, usually unequal, the second often as long as the spike- 
let; lemma membranaceous, 1-nerved, 
awnless; palea usually prominent and 
as long as the lemma or longer; seed 
free from the pericarp. 
Annual or perennial grasses, with 
small spikelets in open or contracted 
Fig. 84. — Smut-grass, Kporobolus berteroanus. Plant, X I ; spikelet and floret, X 5. 
