No. 532] GENETIC AL STUDIES ON (ENOTHERA 201 



plants (strains C and D) have been crossed this year 

 with the best strains of grandiflora (B and D) and I 

 expect to grow the hybrids in another season, when 

 the strains will also be tested for their stability. The 

 testing for purity is of course a necessary precaution, 

 although, as explained above, the habit of self-pollination 

 in biennis makes it very unlikely that any of these plants 

 are tainted with foreign blood. These strains will not 

 be further described until the prospective cultures have 

 been grown. 



Sowings from the wild seed collected as (Enothera 

 grandiflora, described below, have given several plants of 

 a southern form of biennis (strain S) which may prove 

 of considerable interest since some of its characters 

 (stem coloration, form of buds, size of flowers, etc.) are 



