88 



Negative Correlation in Oenothera Hi/hrids 



central spike and on the upper lateral branches. They were in this 

 respect like their parent. .The nnspotted group, on the other hand, had 

 the stem.s only slightly reddened, with the upjier part of the main-stem 

 and upper laterals not conspicuously pigmented with anthocyan. In 

 the dwarf group, (b), only six plants bloonu'd, all belonging to the 

 sub-group with spotted rosettes. Five of them had no anthoeyan in 

 the buds, and one had the pigmentation of (J. rubriculi/.v. All had 

 strongly reddened stems. 



Fig. 1. A dwaif plant witli dark red steins and green buds from self- 

 fertilized (>, rubric(th/.v. (The included scale of inches was drawn 

 from a rule photographed on the same negative ; 1 inch = 2'5 cm.) 



Gates has not mentioned red-spotting of the young rosette-leaves as 

 a characteristic of 0. rahricalyx, but on the other hand he now includes 

 this character among the features which dift'eri'Utiate 0. (/randiflura 

 from 0. rubricalyx (Gates, 1914). The fact that half of my rubncalyx- 

 plants had strongly spotted leaves may perhaps mean, therefore, that 

 my original »'«6nc'«i^.r-plants w'ere hybrids. Another possibility may 

 be suggested. Gates (1914) characterizes the rosette of 0. grandijlora 



