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-bearing 



to the base or nearly so. i. 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 y 2 longer than to 

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



1. Aristida fasciculata Torr. In dry soil from Kans. to Calif, and Tex.; 

 also in Mex. Alt. up to 5500 ft. Canon City. 



2. 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. S. 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 mm. long. 3. 5". Tweedyi. 



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



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

 Panicle loose and open. 



Awn plumose ; panicle-branches ascending. 5. S. 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. 



