jal - dr Li 
1909. No. 8. VASCULAR PLANTS COLLECTED IN ARCTIC NORTH AMERICA. 73 
developed teeth of the corolla, by the faint colouring on the underside 
of the outer rays and by the long stigmas. The just mentioned charac- 
ters are also characteristic of the Ceratophora. Among the species of 
this group it seems nearest related to 7. arctogenum Dautst. (Arkiv f.* 
Botanik, Stockholm, Bd. 5, 9, 1906, p. 26), from which it is easily distin- 
guished by the very broad outer involucral leaves and by the absence of 
pollen. 
