162 



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



about 2 mm. long; palea minutely 37. Eragrostis tracyi Hitchc. (Fig. 



scabrous on the keels; grain nearly 222.) Apparently perennial; culms 



smooth, slightly narrowed toward the erect, tufted, 30 to 80 cm. tall; 



summit, 1 mm. long. 91 — Sandy sheaths rather sparsely pilose at the 



prairies, southern Texas; northern throat; blades flat or, especially of 



Mexico. the innovations, involute, 5 to 25 



Figure 222.— Eragrostis tracyi. Panicle, X 1; floret, X 10. (Type.) 



Figure 223. — Eragrostis silveana. Panicle, X 1; spikelet, X 10. (Type.) 



