Lutz, Triploid Mutants in Oenothera. 



:;9H 



chromosome mutant. Persistent effort was made throughout the 

 flowering season to self-fertilize this plant, but less than a dozen 

 seeds were obtained. O. yiyas pollen, known to be capable of 

 fertilizing flowers of the individual from which it was derived, was 

 repeatedly applied to the stigmas of 5589, but with the same results 

 obtained from the self-fertilization of this plant. It was then noted 



Fig. G. 



that very few seeds had developed in the capsules of the open- 

 pollinated flowers, showing that the female germ cells were mostly 

 sterile, as this plant was surrounded by Lamarcltianas in full 

 flower 12 ). 



Unfortunately, it was utterly impossible to determine the exact 

 number of somatic chromosomes in this form. It was ascertained 



12) De Vries found a plant among his cultures of O. gigas in 1899 which 

 failed to produce seed from artificial self-fertilization, but it is possible that this 

 result was due to defective pollen, as suggested by Gates (15). 



