Variation and Heredity 



295 



These two new forms, as well as the common O. lamarck- 

 iana, were collected, and from these plants there have 

 arisen the three groups or families of elementary species that 

 De Vries has studied. In his garden other new forms also 

 arose from those that had been brought under cultivation. 

 The largest group and the most important one is that from 

 the original O. lamarckiana form. The accompanying table 



OENOTHERA LAMARCKIANA 

 Elementary Species 



Generation 



Gigas 



Oblon- 

 gata 



Rubrt- 



NERVIS 



Lamarck- 

 iana 



Nannella 



Lata 



Scintil- 



LANS 



VIII 



VII 



VI 



V 



IV 



III 



II 



8 Gener. 



1899 

 annual 



7 Gener. 



1898 

 annual 



6 Gener. 



1897 



annual 

 5 Gener. 



1896 

 annual 



4 Gener. 



1895 

 annual 



3 Gener. 

 1890-91 

 biennial 



2 Gener. 

 1888-89 

 biennial 



1 Gener. 

 1886-87 

 biennial 



I I OOOO 



\ ., 



15000 s s 



