CARDUACEAE. 401 



7. Carduus hesperius (Eastw.) Heller. (Cnicus hesperius Eastw.) In 

 mountains of Colo., above timber line. — Mt. Hesperus. 



8. Caiduus griseus Rydb. In the mountains of Colo. — Alt. up to 12,000 ft. 

 — Trappers' Lake; Bosworth's ranch, Stove Prairie; Steamboat Springs; 

 Happy Hollow ; Ward ; Marshall Pass ; Telluride. 



9. Carduus Centaureae Rydb. (Cnicus Americanus A. Gray, in part) In 

 the mountains of Wyo. and Colo. — Alt. 7000-10,000 ft. — Bosworth's ranch ; 

 Stove Prairie ; mountains, Larimer Co. ; Four-mile Hill, Routt Co. ; Penn's 

 Gulch; Steamboat Springs; mountains between Sunshine and Ward; Hins- 

 dale Co. 



10. Carduus erosus Rydb. In the mountains of Southern Colo. — Alt. about 

 7500 ft. — Durango. 



11. Carduus perplexans Rydb. In the mountains of Colo. — Alt. about 7000 

 ft. — Cimarron. 



12. Carduus acaulescens (A. Gray) Rydb. {Cnicus Drummondii acaules- 

 cens A. Gray) In the mountains of Colo. — Alt. 8000-10,000 ft. — Banks of 

 Laramie River ; on Grizzly Creek ; Parlin, Gunnison Co. ; Columbine ; Mar- 

 shall Pass ; Empire. 



13. Carduus americanus Rydb. {Cirsium acaule Americanum A. Gray) In 

 mountain valleys of Colo. — Alt. about 10,000 ft. — Silver Plume; Como; South 

 Park. 



14. Carduus foliosus Hook. (Cnicus foUosus Gray) In the mountains 

 from S. D. and B. C. to Colo. — Dillon. 



15. Carduus coloradensis Rydb. (Cnicus Drummondii A. Gray, in part) 

 In the mountains of Colo. — Alt. about 7500 ft. — Pagosa Springs ; Gunnison ; 

 Wolcott. 



16. Carduus scariosus (Nutt.) Heller. (Cnicus scariosus A. Gray) In the 

 mountains of Wyo., Utah and Colo. — Alt. about 8500 ft. — Columbine. 



17. Carduus spathulatus Osterhout. Hills of, Colorado. — North Park. 



18.. Carduus truncatus Greene. On sage plains of Southern Colo. — West of 

 Mancos. 



ig. Carduus bipinnatus (Eastw.) Heller. (Cnicus hipinnatus Eastw.) In 

 caiions of southwestern Colo. It is scarcely distinct from the preceding. — 

 Johnston Canon, near Mancos River. 



20. Carduus pulchellus Greene. In the mountains of Colo. — Piedra. 



21. Carduus plattensis Rydb. On sand hills of Neb. and Colo. — New 

 Windsor, Weld Co. ; Wray. 



22. Carduus Tracyi Rydb. On dry fields of Colo. — Alt. 5000-7000 ft. — 

 Green Mountain Falls ; Mancos ; Ft. Collins and La Porte. 



23. Carduus canescens Nutt. On dry plains and hills of Wyo. and Colo. — 

 Alt. 7500-8500 ft. — Box Caiion, west of Ouray. 



24. Carduus oblanceolatus Rydb. In the mountains of Wyo. and Colo. — 

 Twin Lakes. 



25. Carduus Flodmanii Rydb. (Cnicus undulatus canescens A. Gray, 

 mainly; not Cirsium canescens Nutt.; Carduus canescens Pammel) In river 

 valleys from Minn, and Mont, to Iowa and Colo. — Alt. 4000-5000 ft. — Cache 

 la Poudre ; Ft. Collins ; La Porte ; Westclifife ; New Windsor, Weld Co. 



26. Carduus floccosus Rydb. In the mountains of Colo. — Wolcott, Eagle Co. 



27. Carduus undulatus Nutt. (Cnicus undulatus A. Gray) On dry plains 

 26 



