GENERA OF GRASSES OF THE UNITED STATES. 



205 



side of the branchlets. Species ten, tropical and temperate regions; 

 five species in the United States, mostly^ swamp grasses. 



Type species: Phalaris oryzoides L. 



Homalocenchrus Mieg, Act. Helv. 

 Phys. Math. 4: 307. 1760. One spe- 

 cies is referred to the genus with cer- 

 tainty, another being doubtfully re- 

 ferred to it. No specific names are 

 used, but under the first there are two 

 citations which appear in the Species 

 Plantarum under Phalaris oryzoides. 



Leersia Swartz, Prod. Veg. Ind. Occ. 

 21. 1788. Three species are de- 

 scribed, L. monandra, L. hexandra, 

 and L. oryzoides. Phalaris oryzoides 



FIG. 122. Rice, Oryza saliva. Plant, X I ; spikelet, X 5. 



L., the basis of the third species, is selected as the type, as this is the oldest 

 historically. 



