24 POACEAE. 



Flowering glumes over 5 nun. long, equally hairy throughout. 



Flowering glumes 5-6 mm. long, spindle-shaped when mature ; callus 



short. 7- S. viridula. 



Flowering glumes 6-7 mm. 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. 11. 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 Canon ; 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; Walsenburg; Arboles; Grayback mining camps; Black Cation 

 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, Mchan) ; 

 but doubtful. 



5. Stipa Porteri Rydb. {S. Mongolica Porter & Coult. ; not Turcz.) 

 Mountains of Colo. — Twin Lakes. 



6. Stipa Richardsonii 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 Canon. 



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

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

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

 West Mancos Caiion ; Rist Canon ; Poudre Cafion. 



9. Stipa minor (Vasey) Scribn. (5". 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- 



