POACEAE. 23 



3. Phalaris canariensis L. Introduced from Europe and Africa; in waste 

 places from N. S. to S. D., Va. and Colo. — Alt. up to 8500 ft. — Gunnison; 

 Colorado Springs. 



15. SAVASTANA. Holy Grass, Vanilla Grass. 



I. Savastana odorata (L.) Scribn. {Hierochloe borealis R. & S.) Among 

 bushes and on banks from Lab. to Alaska, N. J. and Ariz. — Alt. 6500-8500 

 ft. — Stove Prairie, Larimer Co. ; West Cliff ; South Park ; along the Cone- 

 jos River, north of Antonito. 



Tribe 6. AGROSTIDEAE. 



16. ARISTIDA L. Poverty Grass, Wire Grass. 



Spikelets crowded, 4-6 on the short panicle-branches, which are spikelet-hearing 



to the base or nearly so. 1. A. fasciculata. 



Spikelets not crowded, usually 1-3, or if more the branches of the panicle or 

 their divisions with a long, naked base 

 Second glume of the spikelet 1.5 cm. long or less, usually equalling or slightly 

 exceeding the flowering glume. 2. A. Fendleriana. 



Second glume of the spikelet 2 cm. long, from more than J4 longer than to 

 nearly twice as long as the flowering glume. 3. A. longiseta. 



I. Aristida fasciculata Torn In dry soil from Kans. to Calif, and Tex. ; 

 also in Mex. — Alt. up to 5500 ft. — Caiion City. 



■£. Aristida Fendleriana Steud. (A. purpurea Coult. ; not Nutt.) In dry 

 sandy soil from S. D. to Mont., Tex. and Calif. — Alt. 4000-8500 ft. — Los 

 Pinos; Buena Vista; South Park; Salida, Chaffee Co. 



3. Aristida longiseta Steud. In dry soil from 111. to S. D., Wash., Tex. and 

 Mex.— Alt. 4000-8500 ft.— Near Boulder; Trail Glen; New Windsor, Weld 

 Co. ; mountains between Sunshine and Ward ; Arboles ; Durango ; Ft. Col- 

 lins; Colorado Springs; Cucharas Valley; Denver; Pueblo; foot-hills, Lari- 

 mer Co. ; Palisades ; Canon City. 



17. STIPA L. Porcupine-grass, Oat-grass, Wild Oats. 



Outer glumes of the spikelet 2 cm. long or more. 



Awn plumose. i. 5. neo-mexicana. 



Awn not plumose. 



Base of panicle usually included in upper sheaths; flowering scale 8-12 mm. 



long; awn slender and curled above. 2. S. comata. 



Base of panicle exserted; flowering scale over 12 mm. long; awn straight 

 above or nearly so. 

 Flowering scales 12-15 tni"- long. 3. 5". Tweedyi. 



Flowering scales 20-25 mm. long. 4. .S. spartea. 



Outer glumes of the spikelets 1.5 cm. long or less. 

 Panicle loose and open. 

 Awn plumose ; panicle-branches ascending. 5. 5'. Porteri. 



Awn not plumose ; panicle-branches diverging or reflexed at maturity. 



6. S. Richardsonii. 

 Panicle dense and spike-like. 



Empty glumes scarious or hyaline, the nerves hence prominent. 

 Flowering glumes about 5 mm. long, long-hairy towards the apex. 



12. .S". Lettermannii. 



