Cichoriaceae 279 



toothed, obtuse, the teeth shallow and 

 simple, 3-4 inches long, J-J of an inch 

 wide. Flowers bright orange or yellow on 

 smooth scapes, 4-8 inches high; invo- 

 lucral bracts all appressed, in 2 -series, the 

 outer ovate to lanceolate, frequently reddish ; 

 inner ones narrowly lanceolate. 



Throughout the Rockies in the lower 

 valleys and slopes; flowering in early June. 



Sonchus Stems smooth, leafy below, 

 arvensis L. branched and nearly naked 

 MM above, 2-4 feet high. Lower 



and basal leaves runcinate-pin- 

 natifid, often 12 inches long, spinulose den- 

 tate, narrowed into short petioles, the upper 

 pinnatifid or entire, clasping. Flowers bright 

 yellow, numerous in showy heads, 1-2 inches 

 broad; involucre nearly an inch high. 



An introduced weed, occurring more or 

 less frequently along the line of the railway 

 throughout the region; a showy plant when 

 in flower, during the early part of the 

 day. 



