GENERA OF GRASSES OF THE UNITED STATES. 155 



nounced oblique callus, the apex terminating in a long straight 

 scabrous awn. 



Perennial erect, slender grasses, with short knotty rhizomes, flat 

 blades and narrow, rather few-flowered panicles. Species one, North 

 American. 



\ 



FIG. 89. Heleochloa schoenoides. Plant, X I ', spikelet and floret, the palea splitting, X 5. 



Type species: Muhlenbergia erecta Schreb. 



I.nichyelytrum Beauv., Ess. Ajri-ost. .">!>. pi. 9, f. 2. 1812. The type is the 

 figured species, B. erectum, based 011 Huhlenberyia erecta. 



