CARDUACEAE. 367 



Pappus-bristles in one series ; plants 1-5 m. high, shrubby. 



Fertile heads hemispherical, 5-10 mm. broad ; bracts all acute. 



2. B. salicina. 

 Fertile heads deeply campanulate, 3-5 mm. broad ; outer bracts obtuse^ 



3. B. Emoryi. 

 Pappus scant, little if at all elongating, in fruit not exceeding the styles. 



4. B. glutinosa. 



1. Baccharis Wrightii A. Gray. In saline soil from Kans. and Colo, to Tex. 

 and Ariz. ; also in Mex. Brantly Canon, Las Animas Co. ; Soda Spring 

 ledge, Fremont Co. 



2. Baccharis salicina T. & G. In saline soil from Kans. and Colo, to Tex. 

 and N. M. Alt. 4000-5000 ft. Rocky Ford, Otero Co.; Grand Junction; 

 Canon City. 



3. Baccharis Emoryi A. Gray. Along rivers, especially in saline ground, 

 from Colo, to N. M. and Calif. Alt. about 4600 ft. Grand Junction. 



4. Baccharis glutinosa Pers. Along streams from Colo, to Tex. and Calif. ; 

 also in Mex. Grand Junction ; Grand Canon ; Peoria Creek. 



Tribe 4. GNAPHALIAE. 

 35. BERTHELOTIA DC. 



i. Berthelotia sericea (Nutt.) Rydb. (Polypappus sericeus Nutt. ; Pluchea 

 borealis A. Gray) On sandy banks of streams from Colo, and Utah to Tex. 

 and Calif.; also in Mex. Grand Canon. 



36. FILAGO L. 



i. Filago prolifera (Nutt.) Britton. (Evax prolifera Nutt.) On dry 

 ground from S. D. and Colo, to La. and Tex. Plains near Greeley; New 

 Windsor. 



37. ANTENNARIA Gaertn. CAT'S-FOOT, EVERLASTING. 



Pappus-bristles of the staminate heads with clavate or scarious-dilated tips. 

 Plants surculose-proliferous with leafy stolons. 

 Plant caulescent. 



Bracts of the involucres with green or brown upper portion. 

 Bracts dark ; leaves not yellowish. 

 Bracts of the heads lanceolate, acute. 



(Pistillate heads of) i. A. media. 

 Bracts oblong or oval, obtuse. 



Bracts very dark, almost black at the base, but often with white tips. 



(Staminate heads of) i. A. media. 

 Bracts moderately dark, umber-colored throughout. 



2. A. umbrinella. 

 Bracts isabel-colored ; leaves yellowish-white. 



Inner bracts not rose-colored. 3. A. ftavescens. 



Inner bracts rose-colored. 4. A. concinna. 



Bracts of the involucres with white or pink upper portion. 

 Heads 5-8 mm. high. 



Bracts usually with bright pink upper portion. 

 Leaves narrowly oblanceolate, acute. 5. A. rosea. 



Leaves spatulate, obtuse. 6. A. imbricata. 



Bracts with white upper portion. 



