282 BULLETIN 772, U. S. DEPARTMENT OF AGRICULTURE. 
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Fic. 170.—Gama grass, Tripsacum dactyloides. Rhizome, leaves, and inflorescence, X 4 3 
pistillate spikelet and joint of rachis, X 5; pair of staminate spikelets with joint of 
rachis, x) 5: 
