AGROSTIDE^. 353 



Vermont, C. E. Faxon 11, 12; Michigan, Beal 80, Clark 702, 

 2902; Canada, Macoun; ^linnesota, Hohinger ; Montana, Anderson 

 21, 42, WiUiams; Wyoming, Bujjwn C 105; Dakota, Duffeij; Utah, 

 Jones 11 4:5; Washington, Sandherg 325, 535, Suksdorf 1024; 

 Oregon, HowcU. 



Concerning the above species and its synonyms, see Bot, Gaz. 

 11: 175 (1886), for notes by F. L. Scribner. 



Canada, New England to Oregon and California. 



Yar. crassiglumis (Thurb,). Calamagrostis crassighim is Thuvh. 

 S. Wats. Bot. Calif. 2:281 (1880). Deyeuxia crassiglumis Vasey, 

 Cat. Gr. U. S. 50 (1885). 



Leaves of sterile shoots as long as the cnlm, which is 20-30, cm. 

 high; blades of the culm 7-10 cm. long, rigid, reaching to the 

 panicle. Panicle dense, 4-6 cm. long. 



California (Mendocino County), Bolander 4766. 



Yar. confinis (Willd.). Arundo co«/m'.s Willd. Enum. 1:127 

 (1809). Calamagrostis conjinis lUntt Gen. 1:47(1818). I)eyeuxia{?) 

 conjinis Kunth, Rev. Gram. 1:76 (1835). 



Culms more slender than the species; panicle less compact; hairs 

 exceeding the floret a little. 



New York to Minnesota. 



Yar. gracilis Scribn. Coult. Bot. Gaz. 11 : 175 (1886). 



Culms 2-3 cm. high; rudiment 0.4 cm. long, hairs as long as 

 the floret. 



Y^ellowstone Park, Tweedy 58, teste Scribner. 



69. (141). Ammophila Host. Gram. Austr. 4:24, t. Jfl (1809). 

 Psamma Beauv. Agrost. 143 (1812). 



Spikelets 1-flowered in large spikelike panicles, the rachilla 

 articulate above the outer glumes, bearing a tuft of hairs around 

 the floral glume, produced beyond it in a small bristlelikc rudi- 

 ment. Empty glumes persistent, chartaceous, thick, lanceolate, 

 acute, compressed-keeled ; floral glume 5-nerved, similar in texture 

 and about the same length, the apex dentate or sometimes mucro- 

 nate; palea about as long as its glume, of like texture, 2-keeled, 

 2-toothed. sulcate between the keels. Stamens 3. Styles distinct. 

 Grain obovoid, enclosed but not adherent. 



