WIS] 



'The Grasses op Illinois 



411 



274 



Figs. 273-274. — luflorescenees: 273, 77. jubatmn; 274, E. ptisillum 



278 



rigs. 275-278. — Groups of spikclets; 27:', If. jHlxttinn: 270, //. vodm^.inn, 

 277, 77. pnmmeli; 278, 77. pvsiUum 



