Carduaceae 321 



Abundant throughout the region in dry or 

 moist ground and on slopes up to an altitude 

 of 7000 feet; flowering in June and July. 



~ . Stems 1 8 inches to 4 feet tall, 



Carduus 



Kelseyi striate, more or less cobwebby- 



Rybd. woolly. Leaves linear, sinuately 



Whlte toothed and fringed, with rather 



Thistle. . 



weak spines, green above, cot- 

 tony beneath. Heads several in a leafy 

 spike, i-ij inches high, subtended by linear, 

 cut and bristly-fringed and cobwebby-hairy 

 leaves; bracts rather unequal, lanceolate, 

 a few of the outermost with weak spines, 

 the rest unarmed but with a long slender 

 tip; corolla cream-colour. 



Open ground and on slopes at the lower alti- 

 tudes throughout the Rockies; flowering in 



July. 



Persistently white tomentose, i- 

 Carduus 

 undulatus 3 feet high, branching. Leaves 



Nutt. rarely pinnately parted, moder- 



Wavy- ately prickly. Heads of flowers 



Uaved about ij inches high, usually 



Thistle. 



solitary at the ends of the 



