CARDUACEAE. 349 



ft. Pike's Peak; Bosworth's ranch, Stove Prairie; mountains between Sun- 

 shine and Ward; Soldier Canon. 

 A variety with linear bracts was collected in Sheep Canon. 



21. Solidago radulina Rydb. In the mountains of Utah and Colo. Alt. 

 6000-8000 ft. Meadow Park; Gunnison Co. 



22. Solidago trinervata Greene. On dry plains and hills from S. D. and 

 Wyo. to Colo, and Ariz. Alt. 7000-9500 ft. Lower Boulder Canon; Idaho 

 Springs; east of Laramie River; New Windsor; along Bear River, below 

 Steamboat Springs ; Durango ; near Mancos ; lola ; southeast of Ouray ; Wol- 

 cott; west of Ouray; between Porter and Durango; Elk Canon; Ft. Collins; 

 Poudre River; Black Canon of the Gunnison. 



23. Solidago mollis Bartl. (S. nemoralis incana A. Gray) On plains from 

 N. D. and Mont, to Colo, and Tex. Alt. 7000-8000 ft. Ft. Collins; New 

 Windsor; Cucharas Valley, near La Veta. 



20. PETRADORIA Greene. 



i. Petradoria pumila (T. & G.) Greene. (Solidago pumila T. & G.) On 

 high mountains from Wyo. and Nev. to Tex. and Ariz. Alt. 5000-8000 ft. 

 Durango; Grand Junction; Cerro Summit. 



21. EUTHAMIA Nutt. 



i. Euthamia occidentalis Nutt. (Solidago occidentals Nutt.) In moist 

 ground from Mont, and Wash, to N. M. and Colo. Alt. 4000-5000 ft. 

 Hotchkiss, Delta Co.; Sterling; Deer Run; Olathe, Delta Co.; Hotchkiss; 

 Delta. 



22. OLIGONEURON Small. 



i. Oligoneuron canescens Rydb. (Solidago rigida humilis Porter) On 

 prairies and river valleys from Sask. and Mont, to Neb. and Colo. Pagosa 

 Springs ; Hayden. 



23. TOWNSENDIA Hook. 



Bracts acuminate. 



Stems low with spreading basal branches, which surpass it in length. 



i. T. grandiflora. 

 Stems erect or nearly so, wholly simple below. 



Involucre about 1.5 cm. broad, naked. 2. T. eximia. 



Involucre about 2-3 cm. broad, generally subtended by leaves. 



3. T. Vreelandii. 

 Bracts acute or obtuse. 

 Stems evident, leafy. 



Stems 5-20 cm. high ; annuals and biennials. 



Bracts of the involucre 3-ranked ; pubescence of the stem appressed ; 



leaves linear. 4. T. Fendleri. 



Bracts 2-ranked ; pubescence of the stem not strictly appressed; earlier 



leaves spatulate. 5. T. strigosa. 



Stem usually evident, but short, 1-5 cm. long ; perennials. 

 Leaves more or less cinereous. 



Pappus of the rays consisting of bristles Yz- l A as long as those of the 



disk-flowers. 6. T. incana. 



Pappus of the rays reduced to a crown of short squamellae. 



5. T. strigosa. 

 Leaves glabrous or nearly so. 7. T. glabella. 



