CARDUACEAE. 389 



6. Arnica foliosa Nutt. In valleys from Mont, to Colo. Alt. 8000-10,000 

 ft. Silverton; alkali meadow, Higho; Sargent; Parlin. 



7. Arnica celsa A. Nels. In valleys from Wyo. to Colo. Estes Park, Lari- 

 mer Co. ; lola ; Grizzly Creek. 



8. Arnica macilenta Greene. In valleys of Wyo. and Colo. Alt. about 8000 

 ft. Steamboat Springs ; Andrews' Shetland ranch. 



9. Arnica Rydbergii Greene. On hills from Mont, to Colo. Alt. 8000-12,000 

 ft. Lula Pass, Larimer Co. ; Silver Plume ; Cameron Pass ; Eldora to Bal- 

 timore; Hahn's Peak; summit of North Park Range. 



10. Arnica tenuis Rydb. In the mountains of Colo, and Wyo. Alt. 9000- 

 12,000 ft. Beaver Creek. 



11. Arnica coloradensis Rydb. In the mountains of Colo. Exact locality 

 not given. 



12. Arnica subplumosa Greene. (A. Chamissonis longinodosa A. Nels.) 

 In meadows from Mont, to Colo. Alt. 10,000-12,000 ft. Mountains above 

 Ouray; Marshall Pass; mountains east of North Park; Silver Plume; Breck- 

 enridge; Mt. Harvard; Berthoud Pass; Buffalo Pass; Chambers' Lake; 

 Gray's Peak; Fish Creek Falls. 



13. Arnica longifolia D. C. Eaton. (A. polycephala A. Nels.) In meadows 

 from Mont, and Wash, to Colo, and Calif. Alt. 10,000 ft. Keblar Pass; 

 Ethel Peak. 



14. Arnica fulgens Pursh. On hills from S. D., Alb. and B. C. to Colo, 

 and Calif. Alt. 8500 ft. Empire; Pinkham Creek. 



15. Arnica pedunculata Rydb. On hills from N. D. and Wash, to Colo, 

 and Calif. Alt. 6000-10,000 ft. Vicinity of Como; Clear Creek; Estes Park; 

 Horsetooth Gulch; foot-hills, Larimer Co.; gulch south of Boulder; Table 

 Rock; Dixon Canon; Rist Canon. 



16. Arnica monocephala Rydb. On hills from Mont, and Ida. to Colo. 

 Alt. 6000-12,000 ft. Dale Creek, Larimer Co.; Horsetooth Mountain; Bert- 

 houd Pass. 



17. Arnica Parryi A. Gray. (A. eradiata (A. Gray) Heller) In the 

 mountains from Mont, and B. C. to Colo, and Wash. Alt. 9000-13,500 ft. 

 Gore Pass; sources of Leroux Creek; continental divide, Routt Co.; Little 

 Kate Mine, La Plata Mountains; Cameron Pass; Mt. Harvard; Silverton; 

 Silver Plume; Rogers; Buffalo Pass; Berthoud Pass; Caribou; headwaters 

 of Clear Creek; Rabbit Ears, Larimer Co.; Hahn's Peak. 



86. SENECIO L. 



Heads more or less nodding. 



Heads discoid. I. PUDICI. 



Heads radiate. II. AMPLECTENTES. 



Heads not nodding. 

 Heads over 15 mm. high and 20 mm. broad, solitary (seldom 2-3). 



II. AMPLECTENTES. 



Heads less than 15 mm. high and broad. 

 Plants equally leafy throughout. 



Leaves or their divisions not narrowly linear or filiform. 

 Leaves merely toothed and entire, not pinnatifid. 



Leaf-blades oval, elliptic or obovate, usually obtusish ; heads few. 



III. OCCIDENTALES. 



Leaf-blades triangular or ovate to linear-lanceolate, distinctly acute ; 

 heads usually many. 



