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. Walse,nburg ; 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 ; Como ; Calhan ; Red Rock Canon ; Boulder ; 

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

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

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

 Canon; 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 

 Canon; 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 Canon, west of Ouray; Ft. Collins; North Cheyenne Canon. 



33. ESCHENBACHIA Moench. 



i. Eschenbachia Coulter! (A. Gray) Rydb. (Conyza Coulteri A. Gray) 

 On river bottoms from Colo, to Tex. and Calif. Canon City (Brandegee}. 



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. i. B. Wrightii. 



