ABNORMALITIES IN OENOTHERA. 183 



germinating pots each year. They are particularly common 

 in 0. gigas, but no record of them has been kept. 



Variegation op Leaves. — Yellowish areas not infre- 

 quently appear on the rosette leaves, particularly in the Eng- 

 lish Oenotheras. One striking case of what was evidently 

 a sectorial chimera according to Baur's (1909) terminology, 

 occurred in a culture of 55 plants very closely resembling 

 0. Lamarckiana, but having larger rosettes with rather 

 broader leaves. They constituted the second pure generation 



m seeds 



The green 



areas on the leaves in this plant are contrasted with areas 

 which are yellowish white, showing a complete absence of 

 chloroplasts. It will be seen that in several leaves the line be- 



midrib 



mid 



rib. Plate 31. from 



d 



from 



stem 



mostly pure green, while several others are green on one- 

 half and white on the other. A few areas of pale green, 



ab 



The white areas were of course unable to nourish themselves, 

 and continually died away. The plant never formed a shoot, 

 but died before the end of summer, notwithstanding the most 

 careful treatment. The plants of the previous generation 

 gave no indication of such a condition, which therefore ap- 

 peared suddenly in this individual, and appeared, moreover, 

 from a seed of a plant which was normal green throughout. 

 Presumably one side of the young growing 



came about 



matter 



