88 Negative Correlation in Oenothera Hybrids 



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

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

 the stems only slightly reddened, with the upper part of the main-stem 

 and upper laterals not conspicuously pigmented with anthocyan. In 

 the dwarf group, (b\ only six plants bloomed, all belonging to the 

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

 the buds, and one had the pigmentation of 0. rubricalyx. All had 

 strongly reddened stems. 



Fig. 1. A. dwarf plant with dark red stems and green buds from self- 

 fertilized 0. rubricalyx. (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. rubricalyx, but on the other hand he now includes 

 this character among the features which differentiate 0. grandiflora 

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

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

 my original rubricalyx-pl&nts were hybrids. Another possibility may 

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



