GENERA OF GRASSES OF THE UNITED STATES. 



177 



this sometimes bearing a rudimentary lemma ; glumes narrow, acumi- 

 nate, 1-nerved, about equal, shorter than the floret; lemma strongly 



FIG. 104. Crowfoot grass, Dactyloctenium aegyptium. Plant, X i ; spikelet, floret, 

 and seed (without pericarp), X 5. 



compressed, pubescent on the keel, firm in texture, 3-nerved, the 

 lateral nerves close to the margins. 

 97769 19 Bull. 772 12 



