338 



ON ATAVISTIC VARIATION IN OENOTHERA CRUCIATA. 



1901. 



f4th generation. 



l5th generation. 



44 



PEDIGREE OF 



Oenothera cruciata varia 



Number of individuals of each type: 

 Cruciate. Intermediate. Atavistic. 



2 2 



39 



1900. 4th generation. 



1899. 3d generation. < 30 



45 



24 



30 



1898. 2d generation. 



1897. 1st generation. 



(No.l.) (No. 2.) (No. 3.) 



^ 



I give, above, the description of my whole race in the form of a 

 pedigree, omitting the sectorial and bud-variations, again reminding 

 the reader that in every case the seed-bearing plants were fertilized 

 only with their own pollen after enclosure in bags of prepared 

 parchment-paper. 



Though the figures of this experiment are but small, they seem 

 to be sufficient to prove the presence of a very curious case of varia- 

 bility, the alternation between the typical cruciate flowers of the 

 species and the atavistic petals of the group to which the species 

 belongs, and to justify the provisional name chosen for my race: 

 Oenothera or Onagra cruciata varia. 



Amsterdam. 



(Bulletin of the Torrey Botanical Club, Bd. 30, 1903, p. 75.) 



I 



