GENERA OF GRASSES OF THE UNITED STATES. 
171 
7. CHLORIDEAE, THE GRAMA TRIBE. 
82. Leptochloa Beauv. 
Spikelets 2 to several flowered, sessile or short-pediceled, approxi- 
mate or somewhat distant along one side of. a slender rachis, the 
rachilla disarticulating above the glumes and between the florets; 
glumes unequal or nearly equal, awnless or mucronate, 1-nerved, 
Fig. 100. — Aegopogon tenellus. Plant, X I ; group of spikelets, X 5 ; lateral spikelet, 
X 10 ; central (long-awned) spikelet, X 10. 
usually shorter than the first lemma ; lemmas obtuse or acute, some- 
limes 2-toothed and mucronate or short-awned from between the 
teeth, 3-nerved, the nerves sometimes pubescent. 
Annual or perennial grasses, with flat blades and numerous spikes 
or racemes scattered along a common axis forming a long or some- 
