No. 547] GENETIC AL STUDIES ON OENOTHERA 



The original plant was crossed in L910 with the strains 

 grandiflora B and D (for descriptions see Davis, '11, 

 pp. 205-207) and the interesting Y\ hybrids described in 

 this paper were from this cross. 



The chief characteristics of the strain biennis D, when 

 under good cultivation, are as follows : 



1. Rosettes.— Mature rosette (Fig. 1) about 4 dm. 



