74 CYPERACEAE. 



67. Carex capillaris L. In alpine-arctic regions from Greenl. to Alaska, 

 N. H. and Colo. Alt. 10,000-12,000 ft. South Park; West Spanish Peak; 

 Pike's Peak; Georgetown; Devil's Causeway; West Mancos Canon; Twin 

 Lakes; Middle Park; Thompson's Canon, on Long's Peak; Silver Plume; 

 lat. 39-4i- 



68. Carex viridula Michx. In bogs and among wet rocks from Newf. to 

 Wash., Pa., Colo, and Utah. Hamor's Lake. 



69. Carex microglochin Wahl. In arctic-alpine regions from Greenl. to B. 

 C. and Mont.; also in Colo., Europe and Asia. Lat. 39-4i. 



70. Carex retrorsa Schkur. In swamps and wet meadows from N. S. to 

 Ore., Pa. and Colo. Durango. 



71. Carex Engelmannii Bailey. Alpine slopes of Colo. Alt. about 12,000 

 ft. Silver Plume; Upper Clear Creek region. 



72. Carex utriculata Boott. In marshes from Lab. to B. C, Del. and Calif. 

 Alt. 5000-10,000 ft. Gunnison; Veta Pass; South Park; Bijou Basin; 

 Steamboat Springs; Bob Creek, west of Mt. Hesperus; Hamor's Lake, north 

 of Durango; Cascades near Pike's Peak; Twin Lakes; Upper Laramie River; 

 near Chambers' Lake ; Little Beaver Creek. 



C. utriculata var. minor. Not uncommon with the type. 



73. Carex pulla Good. (C. saxatilis L.) In arctic-alpine regions from 

 Greenl. to Alaska and Colo.; also in Europe and Asia. Alt. 7000-10,000 ft. 

 Seven Lakes; Deep Creek Lake; White River Plateau. 



74. Carex monile Tuck. In marshes and wet meadows, N. Sc. to B. C., 

 N. J. and Calif. Alt. up to 10,000 ft. Twin Lakes; Upper Laramie River; 

 Chambers' Lake ; Hamor's Lake. 



75. Carex lupulina Muhl. In swamps from Ont. to Mont., Fla. and Tex. 

 Alt. up to 6500 ft. Durango. 



Order 14. ARALES. 



Plants normal, with flowers on a spadix. Fain. 20. ARACEAE. 



Plants reduced to small floating thalloid -structures, with only 1-3 flowers. 



Fam. 21. LEMNACEAE. 



Family 20. ARACEAE. ARUM FAMILY. 

 i. ACORUS L. SWEET FLAG, CALAMUS. 



i. Acorus Calamus L. In marshes and streams from N. S. to Minn., Fla., 

 Colo, and Texas. Alt. 3500-4500 ft. Fort Collins. 



Family 21. LEMNACEAE Dumort. DUCK-WEED FAMILY. 



i. LEMNA L. DUCK-WEED. 



Fronds long-stalked, mostly submerged, forming large masses. i. L. trisulca. 

 Fronds short-stalked or sessile, floating on the surface. 



Fronds pale and usually strongly gibbous beneath. 2. L. gibba. 



Fronds green or purplish beneath, not gibbous. 3. L. minor. 



i. Lemna trisulca L. In springs and running water from N. S. to Sask., 

 B. C., N. J., Tex. and Cal. ; also in the Old World. Alt. 3500-8000 ft. 



