RANUNCULACEAE. 147 



17. THALICTRUM L. MEADOW-RUE. 



Flowers perfect. 



Plant 2 dm. or less high : achenes turgid; filaments filiform, i. T. alpinum. 

 Plant 3-10 dm. high; achenes flat and very oblique; filaments clavate. 



2. T. sparsiflorum. 

 Flowers dioecious or polygamous. 



Achenes turgid, thick-walled ; ribs thick and almost corky, separated by acute 



grooves. 

 Plants polygamous ; stem-leaves subsessile. 



Achenes, petioles and lower surface of the leaves decidedly viscid-pubescent. 



3. T. dasycarpuui. 

 Achenes, petioles and the lower surface of the leaves glabrous or slightly 



viscid-puberulent. 4- T. purpurascens. 



Plants dioecious ; stem-leaves petioled. 5. T. venulosum. 



Achenes more or less flattened, thin-walled ; ribs not thick, separated by wide 

 shallow rounded grooves ; achenes not twice as long as broad, decidedly oblique. 



6. T. Fendleri. 



1. Thalictrum alpinum L. In alpine and arctic bogs from Greenl. to 

 Alaska, Colo, and Calif. Alt. 9000-12,000 ft. Como; Alpine Tunnel; Seven 

 Lakes ; Tennessee Pass ; near Wyoming line, North Park ; Hamor's Lake, 

 above Durango ; West Indian Creek ; Pike's Peak ; headwaters of Clear 

 Creek ; alpine ridges east of Middle Park. 



2. Thalictrum sparsiflorum Turcz. In wet ground from Mont, to Alaska, 

 Colo, and Calif. Alt. 6000-8500 ft Happy Hollow ; near Georgetown ; Carle- 

 ton Lake ; Parlin ; Long Gulch, Larimer Co. ; Minnehaha ; headwaters of 

 Clear Creek; Empire. 



3. Thalictrum dasycarpum Fisch. & Lall. In wet meadows from Ont. to 

 Sask. and Colo. Alt. 4000-8000 ft. Ft. Collins; La Veta; New Windsor; 

 bank of river, Larimer Co.; Wahatoya Creek; Pagosa Springs; Walsenburg. 



4. Thalictrum purpurascens L. (T. Cornuti Torn, in part; not L.) In 

 wet meadows from N. S. to Sask., Fla. and Colo. Alt. 4000-6000 ft. Along 

 the Poudre ; Ft. Collins and La Porte ; plains and foot-hills near Boulder. 



5. Thalictrum venulosum Trelease. On hills and in open woods from Man. 

 to B. C. and Colo. Alt. 5000-12,000 ft. Dillon Canon ; Cache la Poudre ; 

 Gunnison ; Estes Park ; Cumberland Mine, La Plata Mountains. 



6. Thalictrum Fendleri Engelm. In the mountains from Wyo. to N. M. 

 and Ariz. Alt. 6000-10,000 ft. Foot-hills, Larimer Co. ; Dillon Canon, 

 Trinidad ; gulch west of Pennock's ; Livermore ; Steamboat Springs ; Four- 

 Mile Hill, Routt Co.; vicinity of Ouray; Villa Grove; Ute Pass; Dillon; foot 

 of Pike's Peak ; Veta Pass ; West Indian Creek ; North Cheyenne Canon ; 

 Mancos; Silver Plume; Idaho Springs; Arboles; Pagosa Peak; Chicken 

 Creek; Bob Creek; Colorado Springs; Turkey Creek; Sangre de Cristo 

 Creek; Eldora to Baltimore. 



Family 55. NYMPHAEACEAE DC. WATER-LILY FAMILY. 

 i. NYMPHAEA L. YELLOW WATER-LILY. 



i. Nymphaea polysepala (Engelm.) Greene. In lakes and slow streams 

 from Mont, to Alaska, Colo, to Calif. Alt. up to 11,000 ft. Chambers' Lake; 

 Bierstadt Lake. 



