BDllellD Tennessee AzrlCQltoral CxperlsieDt Station, 1894. 



Plate XX. 



Fig. 77. Aristidn oiigantha. 



Fig. 7S. Stipa arenarea. 



2. Inflorescence. 3. Empty glumes. 4. 2. I'anlcle. 3. Upper leaf. i. Empty 



Flowering glume. glumes. .'>. Flowering glume. 



Vis:. 79. Muhlpnhersia rapillaris. 



2 I'anlcle .". I'pper leaf. 4. bplkelet. 



Fis. SO. Muhlenhpfgia difTusa. 



2. Panicle. :;. Splkelet. 4. Splkelet ex- 

 panded. 5. Emp:y glumes. 



