Lutz, Triploid Mutants in Oenothera. 



in 5589 (Fig. 4) than in 0. Lamarcldana (Fig. 6), or the 21-chromo- 

 some mutant (Fig. 3), so that the distance between the tops of the 

 farthest outreaching basal branches was much less than that for 

 either of the latter. This is a character which is distinctive of 

 most of the types of O. gfyas having basal branches which I have 

 observed (Fig. 7). 



Fig. 5. 



5589 differed further from the 21 -chromosome mutant in that 

 it maintained yellow buds throughout the season, though the bud- 

 cones were angular and regularly tapering, as were those also of 

 the 21-chromosome mutant. Pollen was produced in less abundance 

 than in the latter form and was found also to be composed of a 

 mixture of 3-lobed grains and grains having 4 or more lobes, but 

 there appeared to have been even a higher percentage of grains 

 lacking protoplasmic content than was characteristic of the 21- 



