366 CARDUACEAE. 



45. Erigeron Wootonii Rydb. {E. cinereus var. 7 A. Gray) In sandy soil 

 from Colo, to N. M. and Ariz. — Alt. up to 7000 ft. — Walsenburg; Antonito; 

 Grand Lake; Garden of the Gods. 



46. Erigeron divergens T. & G. Low plains and river banks from Mont, 

 and Wash, to N. M. and Calif.— Alt. 5000-8500 ft. — Golden City; Steamboat 

 Springs; Durango; Mancos ; Arboles ; Ouray; Cedar Edge; Sargent; Hon- 

 nold; Hotchkiss; Big Creek Gulch; Empire; Boulder; Buena Vista; Colorado 

 Springs. 



47. Erigeron flagellaris A. Gray. {E. stolonifer Greene) On banks of 

 streams and river valleys from S. D. and Wyo. to N. M. and Utah. — Alt. 

 5000-11,000 ft. — Durango; Ft. Collins; southeast of Ouray; Cucharas River, 

 below La Veta ; Arboles ; Mancos ; headwaters of Sangre de Cristo Creek ; 

 Bob Creek, west of Mt. Hesperus ; Corao ; Calhan ; Red Rock Cafion ; Boulder ; 

 Middle Park ; Veta Pass ; Sargent ; Columbine ; Boulder ; Castle Cation ; 

 Walsenburg ; Como ; Trappers' Lake ; Poudre, near the Narrows ; Eldora to 

 Baltimore; bank of Purgatory River, near Trinidad; Moon's ranch; Poudre 

 Caiion ; Horsetooth Gulch ; Quimby ; Howe's Gulch. 



48. Erigeron cinereus A. Gray. {E. divergens cinereus A. Gray) On river 

 bluffs from Colo, and Utah to Tex. and Ariz.— Alt. 6500-7500 ft.— Manitou; 

 river bluffs north of La Veta ; Los Pinos (Bayfield) ; Arboles. 



49. Erigeron nudiflorus Buckl. Hills and river bluffs from Colo, to Tex. 

 and Ariz. — Alt. 7000-8000 ft. — Ft. Collins ; butte, five miles southeast of La 

 Veta ; Quimby ; Horsetooth Mountain ; Horsetooth Gulch. 



50. Erigeron argentatus A. Gray. On dry plains from Mont, and Wash, 

 to Col. and Nev. — Grand Junction. 



51. Erigeron canus A. Gray. On dry plains from S. D. and Wyo. to Neb. 

 and N. M. — Alt. 4000-9000 ft. — Near Empire ; Colorado Springs ; Sunset 

 Caiion ; Lake City ; Sangre de Cristo Creek ; Grayback mining camps and 

 Placer Gulch ; Mancos ; Almelia. 



52. Erigeron subcanescens Rydb. On dry plains from Mont, and Alb. to 

 Colo.— North Park. 



53. Erigeron caespitosus Nutt. On dry plains from Sask., Yukon and B. C. 

 to Colo. — Alt. about 9500 ft. — Chambers' Lake. 



32. LEPTILON Raf. Horseweed, Canada Fleabane. 



I. Leptilon canadense (L.) Britton. {Erigeron Canadense L.) In waste 

 places and dry soil from Lab. and B. C. to Fla. and Calif. ; also in W. Ind. 

 and Mex. and introduced in Europe. — Alt. 4000-8000 ft. — Gunnison; Minne- 

 haha ; Box Caiion, west of Ouray ; Ft. Collins ; North Cheyenne Caiion. 



33. ESCHENBACHIA Moench. 



I. Eschenbachia Coulteri (A. Gray) Rydb. {Conyca Coulteri A. Gray) 

 On river bottoms from Colo, to Tex. and Calif. — Caiion City (Braudcgee). 



34. BACCHARIS L. Grounsel Tree, Pencil Tree. 



Pappus copious, in fruit elongating and surpassing the styles. 



Pappus-bristles in several series ; plant 3-6 dm. high, herbaceous with a 

 woody base. 1. B. Wrightii. 



