GENERA OF GRASSES OF THE UNITED STATES. 99 
the opposite sides of the spike being imbricate in a row, so that the 
spike appears to be 4-rowed. In 6-rowed barley (1. hewastichon L.) 
O 17 « aa 
el iy, Sica ee 
Pa eS ts ai paw 
Fic. 49.—Bottle-brush grass, Wystric patula. Plant, % 43; spikelet and floret, X 3. 
the lateral spikelets form rather distinct rows. In 2-rowed barley 
(H. distichon lL.) the lateral spikelets are all infertile and reduced, 
