I9I4-J SOUTHEASTERN NORTH AMERICA. 207 



Paleocene species in France and Belgium, four Ypresian species in 

 the south of England and a Lutetian species in France. There are 

 eight Oligocene species very common in deposits of this age through- 

 out Europe. Over twenty species have been recorded from the Mio- 

 cene of Colorado and California in this country, from France, Swit- 

 zerland, Germany, Italy, Austria-Hungary, and Russia in Europe, 

 and from Japan and Java in Asia. There are three or four Pliocene 

 species in Europe. While the evidence is not so clear as in the case 

 of Paliurus there is a possibility that Zizyphus too is of occidental 

 origin. 



The genus Reynosia Grisebach with only two existing coastal 

 species ranging from the Florida keys through the West Indies has 

 two characteristic species based on leaves in the Wilcox flora and a 

 third species based on the petrified wood in the overlying Claiborne 

 deposits of Texas. 



The genus Berchemia Neck, has about a dozen existing species, 

 ten of which are confined to eastern and southeasern Asia. There 

 is one in eastern extratropical North America and one in eastern 

 Africa. This distribution could not have been brought about ex- 

 cept by the agency of a cosmopolitan Tertiary range. While the 

 specific differentiation of Berchemia is limited to five or six fossil 

 forms these are very common and wide ranging. The earliest occur- 

 rences are North American and include the Raton, Denver and Fort 

 Union formations of the Rocky Mountain province. The genus 

 makes its apearance in Europe during the Oligocene and is common 

 throughout that region in the Miocene, becoming restricted to south- 

 ern Europe (France, Italy, Sicily and Slavonia) during the Pliocene. 



A species of Hoveniphyllum supposed to represent the existing 

 genus Hovenia Thunberg with a single existing species in southeast- 

 ern Asia, is present in the Plio-Pleistocene of Japan. The genus 

 Colubrina Brongniart with 15 existing species in tropical America 

 and one in southeastern Asia is recorded from the Miocene of 

 Bohemia. 



The genus Pomaderris Labill with about 24 existing species con- 

 fined to Australia and New Zealand has two species in the Eocene 

 of the former region and three species (Pomaderrites Ettingshau- 

 sen) in the Miocene of Prussia, Bohemia and Styria. 



