74 
Colorado Agricultural College 
Beggars-ticks, Sticktight {Bidcns frondosa L.) (Fig. 142). — Seeds 
brown in color, flattened, slightly concave on one side, rough, each side with 
a central ridge as long as the seed ; margins of the seeds barbed downwardly ; 
pappus mostly of 2 downwardly barbed awns, 3-4 mm. long; seeds 5-7 mm. 
long. 
3, Cone-flower 
(Ratihida Raf., Lepachys Raf.) 
Achenes short, flattened, with a broad margin, or wing which drops ofl’ 
at maturity ; pappus of 1-2 awl-shaped teeth. 
