GRASSES OP IOWA. 



129 



Fig. 69 B. Two-ranked barley, Hordeum sativum distic/ion. (After Hackel.) 

 1, Hordeum sativum hezastichon (B 3) group of three spikelets; (B) splkelet from 

 behind; (B 1) from in front; (K 1) fruit from in front; (K 2) from b^hind. (After Nees.) 

 3. Common four-rowed barley, Hordeum sativum vul^are. (After Hackel.) 



