GRASSES OF IOWA. 



4& 



Fig. 34. Spike 

 of Setaria gJauca. 

 (King.) 



Fig. 35. Inflorescence of Koeleria cristata Pers. Eatonia 

 obttisata Gray. Eatonia pennsylvanica Gray. 



Fig. 36. Splkelets of grasses. 



1, Poa pratensis, spikelet four- 

 flowered, the two lower scales 

 the sterile glumes; the flower- 

 ing glume of others only show; 



2, Setaria glauca; 3, Spikelet of 

 Calamagrostis canadensis, the 

 two sterile glumes, flowering 

 glumes and palet; 4, Setaria 

 verticillata. 



