4Ol] FLORA OF BOULDER, COLORADO 253 



Common in the mountainous region, 7000-10000 ft. (Dan- 

 iels, 629). Also at Ward (Rydberg). 



NORTH DAKOTA to MONTANA ; NEW MEXICO to ARIZONA. 



1182. S. Riddellii T. & G. [S. fihfolius Fremontii T. & G.]. 

 RIDDELL'S GROUNDSEL. 



Frequent on the plains about Boulder, 5100-6000 ft. (Dan- 

 iels, 481). 



NEBRASKA to COLORADO ; TEXAS to NEW MEXICO. 



1183. S. multicapitatus Rydb. MANY-HEADED GROUNDSEL. 

 Plains about Boulder, 5600 ft. (Daniels, 401). 

 COLORADO to NEW MEXICO and ARIZONA. 



1184. S. spartioides T. & G. BROOM-LIKE GROUNDSEL. 

 Along Boulder Canon road, 5500 ft. (Daniels, 804). Also 



mountains between Sunshine and Ward (Rydberg). 

 NEBRASKA to WYOMING; TEXAS to ARIZONA. 



475. CIRSITIM Hill. THISTLE. 



1185. C. Parry! (Gray), Cockerell. Nov. comb. [Cnicus Par- 

 ryi Gray; Carduus Parryi (Gray) Greene]. PARRY'S 

 THISTLE. 



Boulder (Rydberg). 



COLORADO to NEW MEXICO and UTAH. 



1186. C. scopnlorum (Greene) Cockerell. Nov. comb. [Cni- 

 cus eriocephalus Gray; Carduus scopulorum Greene]. 

 CRAG THISTLE. 



Arapahoe Peak above timberline, 10500-12000 ft. (Daniels, 

 887). Also at Ward (Rydberg). 

 COLORADO. 



1187. C. griseum (Rydb.) Cockerell. Nov. comb. [Carduus 

 griseus Rydb.]. GRAY THISTLE. 



Ward (Rydberg). 

 COLORADO. 



1188. C. Amerieamim (Gray), Daniels. Nov. comb. [Cnicus 

 Americanus Gray; Carduus Centaureae Rydb.; Cirsium 



