58 CYPERACEAE. 



I. DULICHIUM I.. C. Richard. 



1. Dulichium arundinaceum (L.) Britt. In wet and muddy places from 

 N. S. to B. C, I'la. and Tex. — Locality not given. 



2. CYPERUS L. CvriiRus, Galingale, Nut-grass, Papyrus. 



Rachis persistent. 

 Annuals. 



Glumes awned or mucronate: i. C. intiexus. 



Glumes acute, neither awned nor mucronate. 2. C. acuminalus. 



Perennials. 



Glumes tipped with a curved or bent awn. 3. C. Fcndlerianus. 



Glumes blunt or merely mucronate. 4. C. Bushii. 



Rachis deciduous above the two empty glumes. 5. C. filiculmis. 



1. Cyperus inflexus Mulil. In v^et, sandy soil from Vt. to B. C, Fla. and 

 Calif.; also in Max. — Alt. 5000-6500 ft. — Plains and foot-hills near Boulder; 

 Ft. Collins; along Platte River, near Denver; Canon City; New Windsor, 

 Weld Co.; Arkansas River; along Poudre River. 



2. Cyperus acuminatus Torr. & Hook. In wet soil from 111. to Ore., La. 

 and Calif. — Exact locality not given. 



3. Cyperus Fendlerianus Boeckl. In wet soil from Tex. to Colo., Ariz, 

 and Mex. — Alt. 4000-6000 ft. — Colorado Springs ; Arkansas Caiion. 



4. Cyperus Bushii Britt. (C Schweinitzii Coult. ; not Torr.) In sandy 

 soil from Wise, to Ore., Kans. and Colo. — Alt. 4000-5000 ft. — ^Denver; 

 Meadow Park. 



5. Cyperus filiculmis Vahl. In dry fields and on hills from N. H. to Minn., 

 Fla. and I'ex. — Alt. about 55CX) ft. — Colorado Springs. 



3. ERIOPHORUM L. Cotton-grass. 



Achenes obovoid, obtuse. 



Glumes ovate-lanceolate; achenes light brown. i. E. polystacbyon. 



Glumes oval or ovate, obtuse ; achenes dark brown, almost black. 



2. E. ocreatum. 

 Achenes linear-oblong, acute. 3. E. gracile. 



1. Eriophorum polystachyon L. In bogs from Greenl. to Alaska, Ga. and 

 Colo. — Alt. 4000-11,500 ft. — Hamor's Lake, north of Durango; Seven Lakes; 

 West Cliff; Estes Park, Larimer Co. 



2. Eriophorum ocreatum A. Nels. In bogs of Wyo. and Colo. — Twin 

 Lakes. 



3. Eriophorum gracile Koch. In bogs from Newf. to Alaska, Pa. and 

 Calif. — Estes Park, Larimer Co. 



4. SCIRPUS L. Bull-rush, Club-rush. 



Involucre of a single bract or wanting. 



Spikelets solitary, rarely 2 together ; plants dwarfed. 



Annuals; bristles none. i. S. coloradensis. 



Perennials ; bristles present. 



Involucre none. 2. 5. pauciftorus. 



Involucre of one erect bract. 



