234 BULLETIN 772, U. S. DEPARTMENT OF AGRICULTURE. 
depression a tuft of woolly hairs, the palea concave below, gibbous 
above, the apex often free at maturity. 
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F:¢, 141.—Panicum geminatum. Plant, X 2; two views of spikelet and fertile floret 
x10: 
Large branching perennials, with woody culms often clambering 
several feet high into shrubs or trees, the blades firm, flat, usually 
