OENOTHERA OIOAS NANELLA, A MENDELIAN MUTANT 



:;i 



biennial specimens of the previous or third generation. The an- 

 cestors of all these plants had been fertilized by myself in bags 

 down from the mutant in 1896 which started the race. The harvest 

 of 1912 and 1910, sown in 1913, gave the result as shown in table II. 



Table II. 

 A. Percentages of dwarfs among offspring of 0. gigas. 



From a second strain, derived from the same mutant and des- 

 cribed in my Gruppenweise Artbildung (p. 175), I had in 1911-1912 

 nine biennial specimens which yielded a sufficient harvest. Tried 

 in the same way, they gave the percentages of dwarfs shown in 

 table III. 



Table III. 

 B. Dwarfs of 0. gigas. 



Generation 



Number of 

 seed-bearer 



Total 

 of seedlings 



Dwarfs 



Percentage 

 of dwarfs 



6th generation 



132 



0.0 

 0.0 

 0.6 

 0.0 



15.7 

 0.0 

 0.0 

 0.0 



15.0 



