T. D. A. Cocker ell — Descriptions of Tertiary Plants. 53 ' 



Art. L. — Descriptions of Tertiary Plants, II ; by T. D. A. 



CoCKERELL. 



The plants discussed below are all from the North American 

 Miocene. They represent a flora containing many genera at 

 that time widely spread over the Holarctic Region, but in 

 later times driven southward, and to-day existing in much 



Fig. 2. 



Fig. 1. 



Fig. 1. Geaster florissantensis. 



Fig. 2. Pinus sturgisi. 



more limited areas ; some in Asia, others in various parts of 

 America. They show very clearly that many of the ostensibly 

 endemic genera of various regions may well have originated 

 elsewhere, and are merely making their last stand where we 

 now find them. 



Am. Jour. Sci.— Fourth Series, Vol. XXVI, No. 156.— December, 1908. 



