CARDUACEAE. 387 



zie and Alaska to Colo. Alt. about 8000 ft. Red Mountain, south of Ouray. 



30. Artemisia incompta Nutt. Hillsides from Mont, to northern Colo. 

 Anita Peak. 



31. Artemisia discolor Dougl. In the mountains from Alb. and B. C. to 

 Colo., Utah and Wash. Lake City. 



32. Artemisia Bigelovii A. Gray. On dry plains from Colo, to Tex. and 

 Ariz. Arkansas River. 



33. Artemisia tripartita Rydb. (A. trifida Nutt.) On plains and hills 

 from Mont, and Wash, to Colo, and Ore. Exact locality not given. 



34. Artemisia tridentata Nutt. On dry plains (sage plains) from Neb., 

 Mont, and B. C. to Colo, and Calif. Alt. 4000-9500 ft. Grand River, Sheeps- 

 horn road; Grand River, near State Bridge; Montrose; Pitkin; Gunnison; 

 Steamboat Springs; near Empire; Upper Laramie River; Cimarron; Durango; 

 Sangre de Cristo Creek; Hotchkiss; Breckenridge. 



35. Artemisia arbuscula Nutt. On dry mountains and high plains from 

 Wyo. and Ore. to Colo, and Calif. Hayden flats, Routt Co. 



36. Artemisia nova A. Nels. On high plains of Colo, and Wyo. Alt. about 

 7700 ft. Gunnison. 



37. Artemisia spicifonnis Osterh. On dry plains of Colo, and Utah. Alt. 

 about 9000 ft West side of North Park; Crested Butte. 



38. Artemisia cana Pursh. On dry plains and hills from Sask. and Mont, 

 to Colo. Alt. 4000-10,000 ft. Breckenridge; Marshall Pass; west of Hebron; 

 Hayden flats, Routt Co. ; Timnath. 



39. Artemisia viscidula (Osterh.) Rydb. (A. cana viscidula Osterh.) On 

 dry plains of Wyo. and Colo. Steamboat Springs. 



Tribe 7. SENECIONEAE. 

 83. PETASITES Tourn. SWEET COLTSFOOT. 



i. Petasites sagittata (Pursh) A. Gray. In wet ground from Lab. and 

 Alaska to Minn, and Colo. Alt. 8000-10,000 ft. Eldora to Baltimore ; George- 

 town. 



84. HAPLOESTES A. Gray. 



i. Haploestes Greggii A. Gray. On dry plains from Kans. and Colo, to 

 Tex. and N. M. Southeastern Colorado ; exact locality not given. 



85. ARNICA L. 



Heads radiate. 



Basal leaves and lower stem-leaves with cordate or broadly ovate blades and 



slender petioles. 

 Achenes glabrous or glandular puberulent ; rarely with a few silky hairs above. 



1. A. platyphylla. 

 Achenes densely hirsute or strigose. 



Blades of the leaves broadly oval ; the basal ones with short petioles. 



2. A. silvatica. 

 Basal and lower stem-leaves with long petioles and usually cordate bases ; 



involucres and peduncles more or less villous, slightly glandular. 

 Plant 1-2 dm. high ; leaves thick, usually entire. 3. A. pumila. 



Plant 2-4 dm. high ; leaves thin, usually toothed. 4. A. cordifolia. 

 Basal leaves with spatulate, oblanceolate or lanceolate blades. 



