340 CARDUACEAE. 



5. Chrysopsis amplifolia Rydb. In the mountains of Colo. Alt. 5000-7000 

 ft. Ward ; Longmont ; Manitou. 



6. Chrysopsis Bakeri Greene. (C. incana Greene; C. compacta Greene) 

 On hills from Mont, and Ida. to N. M. Alt. 4000-10,000 ft. Columbine; 

 Montrose; Jack's Cabin, Gunnison watershed; Box Canon, west of Ouray; 

 Redcliffe ; Big Creek Gulch ; Marshall Pass ; Lone Pine Creek, Larimer Co. ; 

 Red Mountain road, south of Ouray; Sangre de Cristo; Deer River; Black 

 Canon ; Cedar Edge ; Rogers ; near Pagosa Peak ; Tennessee Pass, Lake Co. ; 

 Rist Canon ; Graymont. 



7. Chrysopsis alpicola Rydb. On the higher peaks of Wyo. and Colo. 

 Alt. 11,000-13,000 ft. Clark's Peak; South Park; Gray's Peak; Graymount. 



8. Chrysopsis pedunculata Greene. On hills in Colo. Pagosa Springs. 



9. Chrysopsis horrida Rydb. On hills from Neb. and Colo, to Tex. Alt. 

 about 5000 ft. New Windsor. 



10. Chrysopsis arida A. Nels. On dry hills from Kans. and Mont, to N. M. 

 and Ariz. Alt. 5000-12,000 ft. Twin Lakes ; Mount Ouray ; Boulder. 



11. Chrysopsis floribunda Greene. In sandy soil in Colo. Alt. 5000-7000 

 ft. New Windsor; Black Canon. 



12. Chrysopsis pumila Greene. In canons of Neb. and Colo. Alt. 10,000- 

 11,000 ft. Near Empire. 



13. Chrysopsis resinolens A. Nels. In sandy soil of Wyo. and Colo. Alt. 

 5000-6000 ft. Chambers' Lake ; Boulder. 



Chrysopsis resinolens obtusata A. Nels. Alt. 8000-10,000 ft. Mountains 

 between Sunshine and Ward. 



14. Chrysopsis viscida (A. Gray) Greene. (C. villosa viscida A. Gray) 

 In the mountains from Colo, to Tex. and Ariz. Manitou; Breckenridge ; 

 summit of North Park Range. 



15. Chrysopsis hispida (Hook.) Nutt. (C. villosa hispida A. Gray) In 

 sandy river valleys from Sask. and Alb. to N. M. and Ariz. Black Canon 

 of the Gunnison. 



9. CHRYSOTHAMNUS Nutt. RABBIT-BRUSH. 



Bracts of the involucre acuminate. 

 Achenes glabrous. 



Leaves oblanceolate or spatulate, puberulent ; plant less than 2 dm. high. 



i. C. dcprcssits. 

 Leaves narrowly linear, slightly tomentulose or glabrous. 



Bracts thick, strongly carinate, glabrous. 2. C. pulchclliis. 



Bracts thin, not strongly carinate, arachnoid-ciliate. 3. C. Bigelovii. 

 Achenes pubescent. 



Bracts 4-6 in each vertical row. 2. C. pulchellus. 



Bracts 2-3 in each vertical row. 



Outer bracts long-acuminate, produced and more or less foliaceous. 

 Leaves linear, more or less distinctly 3-nerved. 4. C. Parryi. 

 Leaves very narrowly linear, i -nerved. 



Leaves mostly erect ; the upper reduced, not exceeding the heads. 



5. C. Neu'berryi. 

 Leaves arcuate-spreading ; the upper longer than the heads. 



6. C. Howardi. 

 Outer bracts short, neither produced nor foliaceous. 



Heads 5-8 mm. high ; bracts thin, glabrous ; leaves filiform. 



