CARDUACEAE. 401 



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

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



8. Carduus 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. s 



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 foliosus 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. 



19. Carduus bipinnatus (Eastw.) Heller. (Cnicus bipinnatus Eastw.) In 

 canons 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 Canon, 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; Westcliffe; 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 



