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In the sterile specimens, the leaves of Asiatic Empetrum are remar- 

 kably narrower than the Europaean. In this case, the respective rela- 

 tion is quite contradictory to the genus Diapensia. With the exception 

 of Stellarla media, Oxalis corniculata, and a few circumpolar elements 

 Asiatic plants differ from the Europaean specifically or as a variety. 

 The west flank of distribution of East-Asiatic plants is Baical-Davurian 

 region as I had already noticed in the page 252 of Tokyo Botanical 

 Magazine XLVII, 1933. This is probably due to the big gap made 

 by the basins of the Obi and the Jenisei where had been the sea con- 

 tinued to Aral Sea and Caspian Sea untill quite recent geological age. 

 North American plants especially Canadian resemble more to the Asiatic 

 than either to the Europaean or to the American as their origin came 

 from the Asiatic side over the Bering-district where the present two 

 continents were connected untill the American glacier had retired to 

 the north arctic region, 



