No. .347] GENETIC AL STUDIES OX (EX OTHER A 413 



llAlbk, represented by 13 plants, narrow leaves, 

 flowers very light yellow, anthers sterile. 



11.415, a single plant similar to 11.4167c except for 

 broader leaves. 



11.41r, representing the class separated as 141 etio- 

 lated rosettes. The plants of this class as they developed 

 gradually outgrew the etiolated conditions of the younger 

 stages, but remained dwarf. They varied greatly among 

 themselves in flower size and foliage, and a dozen differ- 

 ent types could have been selected. 



The above list does not include the numerous types of 

 segregates which clearly differed specifically from the F x 

 hybrid plant 10.30L«. These forms, being of hybrid 

 origin, are of course marked segregates presenting in 

 varying combinations and degrees characteristics of the 

 parents of the cross, bipnnis and f/randiflora. 



2. The F 2 Generation (11.42) from the Hybrid Plant 

 10.30L6 



From the contents of 5 capsules, containing about 

 1,200 seeds, a culture of 992 seedlings appeared in the 

 pans within 6-8 weeks and grew into well-developed 

 rosettes. From these a group of 147 rosettes were 

 readily selected for their uniformly small size and 

 narrow leaves. They gave rise to a definite class of 

 dwarfs which remained absolutely distinct from the rest 

 of the culture ; the plants were not etiolated or in other 

 respects similar to the class of dwarfs separated in the 

 culture (11.41) from the sister hybrid, 10.30La. The 

 rosettes constituting the mass of the culture presented a 

 wide range of form similar to that shown in 11.41, with 

 the extremes approaching the rosettes of the biennis and 

 r/ranr/i flora parents. Between the extremes was the 

 similar large assemblage of intermediates of varying 

 degrees which made a classification of the rosettes im- 

 possible. There was apparently no clearly marked 

 tendency of the rosettes in the culture as a whole to 

 resemble either of the parents. 



