403] FLORA OF BOULDER, COLORADO 255 



South Dakota to Idaho; Missouri to Texas and Colo- 

 rado. 



1194. C. ochrocentrum Gray [Cnicus ochrocentrns Gray; 

 Carduus ochrocentrus (Gray) Greene]. Yellow-spined 



THISTLE. 



Plains, 5100-6000 ft. (Daniels, 1033). 

 Nebraska to Colorado; Texas to Arizona. 



476. CENTAITREA L. Star thistle. 



1 195. C. Cyanus L. Bluebottle. Cornflower. Bachelor's 

 button. 



Escaped into roadsides and streets about Boulder, 5300-5600 

 ft. (Daniels, 140). 

 Europe, thence to North America. 



Family 112. CICHORIACEAE. Reich. Chicory family. 



477. PTILORIA Raf. 



1 196. P. ramosa Rydb. Branching ptiloria. 

 Boulder (Rydberg). 



Nebraska and Montana to Colorado. 



1 197. P. pauciflora (Torr.) Raf. [Stephanomcria runcinata 

 Nutt.]. Few-flowered Ptiloria. 



Plains about Boulder, 5100-6000 ft. (Daniels, 475). Also 

 between Sunshine and Ward (Rydberg). 

 Colorado to Nevada ; Texas to Arizona. 



478. TRAGOPOGON L. Salsify. 



1198. T. pratensis L. Yellow goat's-beard. 



Boulder Caiion road and about Boulder, 5100-7000 ft. (Dan- 

 iels, 559). 



Europe, thence to North America. 



1 199. T. porrifollus L. Salsify. Oyster plant. 

 Common about Boulder, 5100-6000 ft. (Daniels, 17). 

 Europe, thence to North America. 



1199a. T. porrifolius L. X T. pratensis L. 

 Aurora St., Boulder (Cockerell). 



