72 TRIANDRIA. MOJNOGYNlAo oryzopsis, 



Hab. In mountain-meadows in the interior of the Northern 

 States. Neur Deerfielci, Massachusetts. Dr. Coo ley and 

 Mr. Hitchcock. Williamstown, Massachusetts. Prof. 

 Dewey. April — May. On the Broad Mountains of Penn- 

 sylvania. Pursh. 



P UTS h thinks this grass is deserving the attention of agri- 

 culturists, on account of the fine flour yielded by its large 

 seeds. • 



ORDER 11. 

 D I G Y N I A. 



(Gra mina.) 



A. Floioers all perfect, 



t. Spikekts (locustae, Beauv.) 1-Jlozcercd. 

 * Calyx 0. 



1. LEEUSIA. 



** Calyx ^-valvf^d, 



a. Corolla without abortive rudiments at the base. 



1. Glumes and corolla of dissimilar textures- 



inferior valve involving the superior.. 



a. Corolla unarmed. 



2. PASPALUM. 3. MILIUM. 



/3. Corolla owned or bristled at the tip. 



4. PIPTATHEftUM. 5. STIPA. 



6, ARISTIDA, 



2. Glumes and corolla of nearly similar tex' 



ture, often carinate, 



a. Panicle more or less spreading. 



7. MUHLENBERGIA. 10. CINNA. 



8. TRICHODIUM. 11. POLYPOGON. 



9. AGROSTIS. 12. TRICHOCHLOA., 



13. ARUNDO. 



/?. Panicle more or less contracted mto «r 

 spike, 



14. PSAMMA. 16. ALOPECURUS, 



15, CRYPSIS. 17. PHLEUM. 



