Experimental Pedigree-Cultures 575 



suit the requirements of the new species rubri- 

 nervis and gigas. 



All the species of Oenothera growing in Eu- 

 rope have escaped from gardens, where they 

 were introduced from America, but now many 

 of them are as much at home there as the best in- 

 digenous species, and could not be distinguished 

 from them, if their real origin happened to be 

 forgotten. In the same way sooner or later the 

 new types may find their way elsewhere and 

 contribute to the flora of some other country, as 

 other introduced species have done before 

 them. 



