24 POACEAE. 



Flowering glumes over s mm. long, equally hairy throughout. 



Flowering glumes s-6 mm. long, spindle-shaped when mature ; callus 



short. 7. S. viridula. 



Flowering glumes 6-7 ram. long, almost cylindric ; callus long and 

 pointed. 8. S. Nelsonii. 



Empty glumes firm, thickish, membranous or herbaceous ; nerves not promi- 

 nent. 

 Flowering glumes 4-5 mm. long; leaf-blades very narrow, involute. 



9. S. minor. 

 Flowering glumes 8-10 mm. long; leaf-blades broad. 



Panicle slender ; stem low and slender. 10. 5'. Scribneri. 



Panicle stout and dense ; stem tall and stout. 1 1 . 5. Vaseyi. 



1. Stipa neo-mexicana (Thurb.) Scribn. Dry hills from Colo, to N. Mex. 

 and Calif. — Alt. up to 6000 ft. — Colorado Springs. 



2. Stipa comata Trin. & Rupr. On dry plains and hills, especially in sandy 

 soil, from Alb. to Alaska, N. Mex. and Calif. — Alt. 4000-8500 ft. — Along the 

 Platte River, Denver; New Windsor, Weld Co.; Mancos; Almeha; Ft. Col- 

 lins; mesas opposite Grand Junction; Rist Caiion; near Narrows along Pou- 

 dre River. 



3. Stipa Tweedyi Scribn. Plains and valleys from Alb. to Wash., Colo, 

 and Ariz. — Alt. 5000-10,000 ft. — Ft. Collins; near Badito, between La Veta 

 and Gardner; Walsenbiirg; Arboles; Grayback mining camps; Black Canon 

 of the Gunnison; Chester, Saguache Co.; Durango; Mancos; North Park; 

 Gypsum; Rist Canon. 



4. Stipa spartea Trin. On prairies from Man. to B. C, Ills, and Colo. 

 — Reported from Colorado Springs (Porter) ; South Park {Canby, Mehan) ; 

 but doubtful. 



5. Stipa Porteri Rydb. (S. Mongolka Porter & Coult. ; not Turcz.) 

 Mountains of Colo. — Twin Lakes. 



6. Stipa Sichaidsonii Link. In meadow lands and hillsides from Alb. to 

 Mont., S. D. and Colo. — Mountains west of Laramie River, Larimer Co. 



7. Stipa viridula Trin. {S. parviAora Americana Schultes) Dry prairies 

 and hills from Sask. to Mont., Kans. and Utah. — Alt. 4000-8500 ft. — Gato; 

 Columbine ; plains, Larimer Co. ; Rist Caiion. 



8. Stipa Nelsonii Scribner. Dry plains and hills from Ass. to Ida. and 

 Colo.— Alt. 7500-10,000 ft.— Near Boulder; hills about Box Caiion, west of 

 Ouray; Cerro Summit; Idaho Springs; Poncha Pass; Georgetown; Durango; 

 West Mancos Caiion; Rist Caiion; Poudre Canon. 



9. Stipa minor (Vasey) Scribn. {S. viridula minor Vasey) Dry hill- 

 sides and mountain valleys from Mont, to Utah and N. M.— Alt. 8000-12,500 

 ft.— North Park ; Twin Lakes ; Marshall Pass ; Roger's ; Cumbres ; Colorado 

 Springs; Robinson, Summit Co.; Long Gulch; near Chamber's Lake; Ute 

 Pass road; along the Michigan, North Park; Anita Peak, Routt Co. 



10. Stipa Scribneri Vasey. On foot-hills and mountain-sides of Colo, and 

 N. M.— Alt. 5000-9500 ft.— Plains and foot-hills near Boulder; Trail Glen; 

 Clear Creek Canon, Golden; near Empire; Royal Gorge; Georgetown. 



11. Stipa Vaseyi Scribn. {S. viridula robusta Vasey.) On foot-hills and 

 mountain-sides from Colo, to Ida., Tex. and N. M. ; also in Mex.— Alt. 5000- 

 9000 ft.— Colorado Springs; New Windsor, Weld Co.; Idaho Springs; foot- 



