142 RANUNCULACEAE. 



open woods, in Colo, and N. M. Alt. 7000-10,000 ft. Van Boxle's ranch, 

 above Cimarron; Minnehaha; Ojo; hills southeast of La Veta; Veta Pass; 

 Idaho Springs; Mt. Abram, Ouray; chaparral-covered hills southeast of 

 Ottray; Lake City; Cheyenne Canon. 



3. Atragene diversiloba Rydb. In mountains of Colo. Mountains near 

 Denver. 



4. Atragene tenuiloba (A. Gray) Britton. (Clematis alpina tenuiloba 

 A. Gray.) In mountain woods from S. D. to Mont., Colo, and Ariz. Alt. 

 7000-10,000 ft. Placer; Sheep Canon; North Cheyenne Canon; Williams' 

 Canon, above Manitou ; Colorado Springs ; Pike's Peak. 



12. MYOSURUS L. MOUSE-TAIL. 



Achenes with a flat back, only slightly carinate and tipped with a very short 



appressed beak. i. M. minimus. 



Achenes strongly carinate on the back, tipped with a long subulate ascending beak. 



2. M. aristatus. 



1. Myosurus minimus L. In muddy places and shallow water from Ont. 

 to Wash., Fla. and Calif.; also in Europe and northern Africa. Alt. up to 

 5000 ft. Denver (Eastwood}. 



2. Myosurus aristatus Benth. In muddy places from Mont, to Wash., Colo, 

 and Calif. Alt. up to 9000 ft. Long's Peak. 



13. BATRACHIUM S. F. Gray. WHITE WATER-CROWFOOT. 



Petals 5-7 mm. long, broadly obovate ; stamens many. 



Segments of the leaves 10-15 mm. long, rather rigid, scarcely collapsing when 



withdrawn from the water. i. B. trichophyllum. 



Segments of the leaves 15-30 mm. long, flaccid, collapsing when withdrawn from 



the water. 2. B. naccidum. 



Petals less than 5 mm. long, oblong-obovate ; stamens 5-12. 



Stem slender ; leaves not very flaccid. 3. B. Drouetii. 



Stem filiform ; leaves very flaccid. 4. B. confervoides. 



1. Batrachium trichophyllum (Chaix.) Bosh. (Ranunculus aquatilis tricho- 

 phyllus Chaix.) In water from N. S. to B. C, N. C. and Calif.; also 

 in Mex., Europe and Asia. Alt. 4000-9000 ft. Near Ouray; Grizzly Creek; 

 Ft. Collins ; Sangre de Cristo Creek ; New Windsor ; Denver. 



2. Batrachium flaccidum (Pers.) Rupr. (Ranunculus aquatilis trichophyl- 

 lus A. Gray, in part) In water from Lab. to Wash., N. C. and Low. Calif. 

 Alt. 4000-10,000 ft. Ft Collins; Trail Creek, near junction with North 

 Poudre; Trapper's Lake; below Carson; Upper Laramie River; Boulder. 



3. Batrachium Drouetii (F. Schultz) Nym. In water from Vt. to Alaska, 

 R. I. and Low. Calif. Alt. 7000-8000 ft. Along Uncompahgre River, near 

 Ouray; Parlin, Gunnison Co.; Piedra. 



4. Batrachium confervoides Fries. In water from Man. to Alaska, south to 

 Colo. In Grand Lake. 



14. RANUNCULUS L. CROWFOOT, BUTTER-CUP. 



Leaves linear to oval, entire or merely denticulate or crenate ; none divided or cleft. 



FLAMMULAE. 

 Some of the leaves at least cleft. 



Sepals black-hairy. NIVALES. 



Sepals not black-hairy. 



