GRASSES OF OHIO 
271 
71. Spikelets strictly 1-flowered; branches of the inflorescence in our species 
usually numerous. Spartina. (29) 
71. Spikelets with 1 perfect flower and 1 or more vestigial ones; branches of the 
inflorescence 4 or less. Bouteloua. (34) 
72. Carpellate spikelets in pockets of the rachis; inflorescence without husks or 
hardened leaf-sheaths. Tripsacum. (66) 
72. Carpellate spikelets covered with husks or with the thickened subtending 
leaf sheath. 73 
73, Carpellate spikelets covered by a hardened leaf sheath, forming a bead-like 
fruit. ■ Coix. (67) 
73. Carpellate spikelets in rows on a cob, usually covered with papery husks. 
Zea. (68) 
