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 

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

 Rist Caiion ; 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 ; Clack Cafion. 



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 Caiion 

 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. deprcssiis. 

 Leaves narrowly linear, slightly tomentulose or glabrous. 



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



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

 Achenes pubescent. 



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



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. Newberryi. 

 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. 



