22 POACEAE. 



Second glume of the spikelet as long as the flowering glume or very nearly 

 so ; annuals. 

 Panicle usually i cm. thick or less ; bristles commonly green ; spikelets about 



2 mm. long. 2- C. viridis. 



Panicle usually 1-3 cm. thick ; bristles usually purple ; spikelets 2.5-3 mm. 

 long. 3* ^* italica. 



Second glume manifestly shorter than the flowering glume; perennial. 



4. C composita. 



1. Chaetochloa glauca (L.) Scribn. {Setaria glauca Beauv.) Yellow 

 Fox-tail. In waste places and cultivated grounds from Vt. to Man., Fla. 

 and Tex. — Alt. up to 5000 ft. — -Ft. Collins. 



2. Chaetochloa viridis (L.) Scribn. (Setaria viridis Beauv.) Green Fox- 

 tail. In cultivated ground and waste places from Me. to Wash., Fla. and 

 Calif. — Alt. 4000-6000 ft. — Near Boulder ; Idaho Springs ; Ft. Collins ; 

 Granada. 



3. Chaetochloa italica (L.) Scribn. {Setaria italica Kunth.) Italian 

 Millet, Hungarian Grass. Cultivated and escaped in fields and waste 

 places from Que. to Minn., Fla. and Colo. — Grass station, Ft. Collins. 



4. Chaetochloa composita (H. B. K.) Scribn. In dry soil from Tex. to 

 Colo, and Ariz.; also in Mex. — Alt. 4000-6000 ft. — Caiion City. 



12. CENCHRTJS L. Sand-Bur, Sand-Spur, Cock-Spur, Bur-Grass. 



1. Cenchius tribuloides L. In sandy soil from Me. to Minn., Fla. and Tex. 

 — Alt. 4000-6500 ft. — Near Boulder; Ft. Collins; Caiion City; Colorado 

 Springs. 



Tribe 4. ORYZEAE. 



13. HOMALOCENCHRUS Mieg. Rice Cut-Grass, Catch-fly Grass. 



1. Homalocenchrus oryzoides (L.) Poll. In wet places and swamps from 

 N. Sc. to Wash., Fla. and Calif.— Alt. 4000-5500 ft. — New Windsor, Weld 

 Co. ; Caiion City ; river-flats east of Ft. Collins. 



Tribe 5. PHALARIEAE. 



14. PHALARIS L. Canary-grass. 



Outer glumes not winged; inflorescence a narrow panicle. 1. P. arundinacea. 



Outer glumes winged ; inflorescence a spike or spike-like panicle. 



Spikelets narrow ; third and fourth glumes much reduced ; blade subulate, hairy. 



2. P. caroliniana. 



Spikelets broad, third and fourth glumes thin, membranous; blade lanceolate, 



glabrous or sparingly hairy. 3. p, canariensis. 



i. Phalaris arundinacea L. In swamp and wet meadows from N. Sc. to 

 B. C, N. J. and Nev. Also in Europe and Asia.— Alt. 4000-9000 ft.— George- 

 town; Gunnison; New Windsor, Weld Co.; Fort Collins; Hamor's Lake; 

 Table Rock. 



2. Phalaris caroliniana Walt. In wet soil from S. C. to Calif., Fla. and 

 Mex. — Brantly Caiion, Las Animas Co. 



