I9I4-] SOUTHEASTERN NORTH AMERICA. 209 



cene species are found in North America, Europe, Asia and the 

 Arctic regions. There are five Pliocene species recorded from Eu- 

 rope and Japan and six Pleistocene species in Ontario, New Jersey, 

 France, Germany, Holland and Denmark. The genus has appar- 

 ently had its existing range since Miocene time. 



The genus Grewia Linne has about 90 existing species ranging 

 from Arabia to China and Japan and through Malaysia to Aus- 

 tralia, and from Abyssinia to South Africa. About fifteen fossil 

 forms have been described, the oldest known, five Eocene species, 

 coming from western North America. There are two Oligocene spe- 

 cies in Europe and about six Miocene species in Oregon, Spitzbergen 

 and throughout Europe. The larger number of Grewia-like fossil 

 forms are, however, referred to the genus Grcwiopsis of Saporta. 

 Six of these are from the Upper Cretaceous and all are confined to 

 North America, a very significant fact since several of them are espe- 

 cially well marked. They are found in the Magothy formation of the 

 east coast, the Tuscaloosa formation of the south coast, and the Da- 

 kota Montana and Laramie formations of the western interior. There 

 are about six Eocene species in the Denver, Lance and Fort Union : 

 one in the Wilcox and one in the Claiborne of the Mississippi em- 

 bayment region, six in the Paleocene of France and one in the 

 Ypresian of England. There is also a Miocene ( ?) species recorded 

 from Yellowstone Park. While it is quite possible that some of the 

 fossil records ascribed to the genus Populus are those of Grewia 

 or its ancestral stock, it seems clear that the latter genus or its im- 

 mediate ancestors were common in the Upper Cretaceous and Eocene 

 of North America. 



The fourth fossil genus of Tiliaceae is Apeiobopsis Heer 38 named 

 from its affinity with the existing genus Apeiba Aublet which has five 

 or six species confined to tropical South America. Apeibopsis in- 

 cludes not only leaves but very characteristic fruits. To it are re- 

 ferred somewhat doubtfully determined leaves from the Upper Cre- 

 taceous Dakota sandstone and Atane beds. There are about four- 

 teen Tertiary species including a basal Eocene form from Wyoming, 

 two Ypresian forms from England, a species from West Greenland 



38 To it should probably be referred the Arctic forms described by Heer 

 as N ordenskibldia. 



PROC. AMER. PHIL. SOC. LIII, 214, X, PRINTED JULY 13, 1914 



