60 CYPERACEAE. 



Style-branches 3. 



Achenes cancellate and longitudinally ribbed ; spikelet flat. 



4. E. acicularis. 

 Achenes smooth, papillose or reticulate ; spikelet terete. 



Achenes papillose. 5. E. acuminata. 



Achenes finely reticulate. 



Spikelets ovoid, blunt. 6. E. arenicola. 



Spikelets narrowly oblong, acute. 7. E. montana. 



1. Eleocharis atropurpurea (Retz.) Kunth. In wet soil from Iowa to Colo., 

 Fla. and N. Mex. ; also Mex. and Trop. Am. Reported from Colorado, but 

 doubtful. 



2. Eleocharis palustris (L.) R. & S. In swamps from Lab. and Alaska to 

 Va. and Calif. ; also in Europe and Asia. Alt. 4000-10,000 ft. Trimble 

 Springs, near Durango; Gunnison; Ruxton Dell; Sterling, Logan Co.; New 

 Windsor, Weld Co. ; Ft. Collins ; along Platte River, near Denver. 



3. Eleocharis glaucescens (Willd.) Schultes. In swamps and wet mead- 

 ows from Me. to Mont., Fla. and Ariz. Alt. 4000-7000 ft. Cucharas River, 

 below La Veta; Julesburg; mesas near Pueblo; Quimby. 



4. Eleocharis acicularis (L.) R. & S. In wet soil and mud from Newf. 

 to Sask., Wash., Fla. and Calif. ; also Mex., Cent. Am., Europe and Asia. 

 Alt. 4000-10,000 ft. Divide between Colorado Springs and Denver; New 

 Windsor, Weld Co. ; Georgetown ; river bank, Ft. Collins. 



5. Eleocharis acuminata (Muhl.) Nees. In wet soil from N. Sc. to Alb., 

 Ga., La. and Colo. Mt. Lincoln. 



6. Eleocharis arenicola Torr. On sandy shores and in swamps from S. C. 

 to Colo., Fla. and Tex. Salida. 



7. Eleocharis montana (H. B. K.) R. & S. In wet places from Colo, to 

 Calif, and Mex. Alt. about 7000 ft. Dolores. 



6. FIMBRISTYLIS Vahl. 



Leaves strongly involute. i. F. castanea. 



Leaves flat. 2. F. thermalis. 



1. Fimbristylis castanea (Michx.) Vahl. In saline soil from N. Y. to 

 Neb., Fla. and Tex. Lat. 39-4i. 



2. Fimbristylis thermalis S. Wats. Usually near warm springs from Colo, 

 to Calif. Sterling, Logan Co. 



7. ELYNA Schrad. 



i. Elyna Bellardi (All.) Koch. (Kobresia scirpina Willd.) In wet places 

 in alpine or arctic regions from Greenl. to Alaska and Alb. ; also in Colo. 

 Alt. 8500-13,000 ft. South Park; Twin Lakes; Georgetown; Clear Creek, 

 near Georgetown ; summit of Mt. Garfield ; Ruxton Dell ; Sierra Blanca. 



8. CAREX L. SEDGE. 



Stigmata 2 ; spikes all or nearly all bisexual, or dioecious, sessile. 



VIGNEAE. 



Stigmata 3 ; or if 2, the spikes mostly unisexual, the lateral ones pistillate (species 

 of Microrhynchae, C. pulla and C. misandra'). CARICES GENUINAE. 



