394 



Lutz, Triploid Mutants in Oenothera. 



with certainty however, that there were not less than 20 nor more 

 than 22. 



The offspring of 5589 were also grown by Dr. Shu 11 in the 

 .summer of 1911. 



It was first thought that this plant might represent some type 

 of 0. yiyas, possibly that of the original mutant, for it reached 



Fig. 7. 



a height of 12.2 dm. at the close of the season without having 

 entirely completed flowering (and therefore without having reached 

 its full height), and de Vries described (). /////as (5, Bd. I, p. 158) as 

 attaining about the same height as that of 0. Lauiarcldana. O. La- 

 innrch-lfiiin in the Cold Spring Harbor cultures commonly completed 

 growth at a height of 13 or 14 dm. 0. yiyfis of these cultures on 

 the contrary, seldom attained a height of 12 dm., and commonly 

 did not exceed 10, 8, or even 6 dm. However, it must be recalled 

 that all 0. yigas now in cultivation are probably descended from 



