58 CYPERACEAE. 



I. DULICHIUM L. C. Richard. 



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

 N. S. to B. C, Fla. and Tex.— Locality not given. 



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



Rachis persistent. 

 Annuals. 



Glumes awned or mucronate. i- C. inAexus. 



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



Perennials. 



GlumeSf tipped with a curved or bent awn. 3. C. Fendlerianus. 



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



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



1. Cyperus inflexus Muhl. In wet, sandy soil from Vt. to B. C, Fla. and 

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

 Ft. Collins; along Platte River, near Denver; Caiion 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 Tex. — Alt. about 5500 ft. — Colorado Springs. 



3. ERIOPHORUM L. Cotton-grass. 



Achenes obovoid, obtuse. 



Glumes ovate-lanceolate; achenes light brown. i. £. polystachyon. 



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



2. B. 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. 1 . S. coloradensis. 



Perennials ; bristles present. 



Involucre none. 2. 5. pauciHorns. 



Involucre of one erect bract. 



