CARDUACEAE. 393 



Stem-leaves lanceolate or oblanceolate in outline, with narrow segments. 



53. 5. flavulus. 

 ^tern-leaves spatulate or oblanceolate in outline, with short and broad 



segments. 51. S. mutabilis. 



Heads discoid. 



First basal leaves reniform. 52. 5\ nephrophyllus. 



None of the leaves reniform. 



Plant yellowish or light green, 3-5 dm. high. 53. S. flavulus. 

 Plant dark green, about 1.5 dm. high. 54. S. fedifolius. 



XV. ANDICOLAE. 

 Blades of the basal leaves reniform, orbicular, obovate or cunea.te ; toothed at least 



at the apex, obtuse. 



Rays golden yellow. 55. 5". petrocallis. 



Rays pale-yellow. 



Involucre hemispherical to campanulate. 



Flowering stems about 2 dm. high; heads 9-10 mm. high; basal leaves 



crenate-serrate, except at the very base. 56. S. cognatus. 



Flowering stems less than 1.5 dm. high; heads 10-12 mm. high. 



Heads several ; leaf-blades obovate or ovate, slightly tomentose. 



57. S. pentodontus. 



Heads solitary ; leaf-blades reniform, glabrous. 58. 5". Porteri. 

 Involucre turbinate. 59. 5". turbinatus. 



Blades of the basal leaves elliptical to linear, entire or very rarely some of them 



3-toothed at the apex, acute. 



Leaves elliptic ; heads about i cm. high. 60. 5*. perennans. 



Leaves narrowly oblanceolate ; heads 78 mm. high or the central one rarely 

 i cm. 61. S. tverneriaefolius. 



XVI. ERIMOPHILI. 



One species. 62. 5\ MacDougalii. 



XVII. LONGILOBI. 



Plant more or less permanently tomentose. 63. S. filifolius. 



Plant glabrous, at least in age. 



Leaves, except those of the branches, pinnately divided. 



Heads campanulate; bracts 12-15. 64. S. Riddellii. 



Heads almost cylindrical; bracts 8-10. 65. 5". multicapitatus. 



Leaves entire, linear-filiform or some rarely with a pair of filiform lobes. 



66. 5". spartioides. 



1. Senecio scopulinus Greene. (S. Bigelovii Hallii A. Gray) In the moun- 

 tains of Colo, and Wyo. Alt. 8000-10,000 ft. North Park; Parlin; Veta 

 Pass ; Yampa ; Empire ; Steamboat Springs ; Grizzly Creek. 



2. Senecio chloran.tb.us Greene. In the mountains of Colo. Alt. 9000-11,000 

 ft. Coffee Pot Springs ; White River Plateau ; Marshall Pass ; near Pagosa 

 Peak; Ruxton Dell; La Plata River; Alpine Tunnel; Bald Mountain; Vance 

 Junction ; Medicine Bow Range ; Twin Lakes. 



3. Senecio contristatus Greene. In the mountains of Colo. Alt. about 

 10,000 ft. Keblar Pass. 



4. Senecio pudicus Greene. (S. cernuus A. Gray; not L.) In the moun- 

 tains of Colo. Alt. 7000-12,000 ft. Clear Creek; Georgetown; Mt. Harvard; 

 Como; Mt. Ouray; Black Canon; Bear Creek Canon, near Pike's Peak; Ute 

 Pass ; Cheyenne Canon ; Pike's Peak ; Twin Lakes ; west of Ouray ; between 

 Pallas and Sydney; Grand Lake; Minnehaha; Empire; between Sunshine 

 and Ward; Como; Marshall Pass; Lake City. 



5. Senecio amplectens A. Gray. In alpine and subalpine regions of Colo. 

 Alt. 9000-13,000 ft. Peak near White House ; Silverton ; Mt. Harvard ; Gray's 



