162 MISC. PUBLICATION 200, U. S. DEPT. OF AGRICULTURE 



38. Eragrostis silveana Swallen. (Fig. 326.) Perennial; culms 

 densely tufted, erect from a knotty base, 40 to 50 cm tall; sheaths 



[Figure 325.— Eragrostis tracyi. Panicle, X 1; floret, X 10. (Type.) 



glabrous; blades flat or loosely involute in drying, elongate, 3 mm 

 wide, attenuate to a fine point, glabrous; panicle 25 to 35 cm long, 



Figure 326.— Eragrostis silveana. Panicle, X 1; spikelet, X 10. (Type.) 



10 to 15 cm wide, the viscid scabrous branches stiffly ascending or 

 spreading, naked at base, sparsely pilose in the axils; spikelets pur- 



