No. 561] GENETIC AL STUDIES ON OENOTHERA 



branched and with revolute leaves, very narrow above. 

 The plants failed to flower. 



Group E included 23 plants with a stiff upright habit 

 and much-crinkled leaves. They resembled most closely 

 the larger forms in group A, but were without the short 

 internodes characteristic of those plants. 



Group F contained the mass of the culture, 362 plants, 

 after the separation of the groups described above. As 

 a group it presented the best illustration of the relative 

 segregation of characters that I have so far met in an 

 F 2 generation. There was a very wide range of varia- 

 tion in flower size, habit and leaf form. A few types re- 

 sembling grandiflora could be picked out at one end of 

 the series, while at the other end were plants much closer 

 to the biennis parent than have usually been found. 



