468 



COBB AND BARTLETT: INHERITANCE IN OENOTHERA 



TABLE 2 

 Fi Progenie of Crosses between Strains E and C, of which mut. formosa was 



THE Pistillate Parent 



^ Culture number of the individual of mut. formosa used in both crosses, Lexington 

 E-5-199-28. 



Culture number of mut. latifolia, Lexington C-22-13-87; of mut. gynocrates. 

 Lex. C-52-2-13. 



there is no doubt, from the evidence at hand, that the flatness of 

 the leaves in the C strain, but not in the E strain, acts as a 

 dominant in crosses with the revolute mutations, when the lat- 

 ter enter into the cross as the female parent. When mut. formosa 

 is pollinated by any form belonging to strain C, a diversified 

 progeny is obtained, but all of the individuals have flat leaves. It 

 will be seen by reference to table i that self -pollinated mut. 

 formosa itself gives a highly diversified progeny, consisting of 

 mut. formosa, mut. albicans, mut. revoluta, and mut. setacea. 

 The three latter are interpreted as secondary mutations from the 

 former. If one were to picture a progeny containing all of these 

 revolute-leaved mutations, with their leaves flattened out, but 

 with their other characters unaffected, the progeny of the cross 

 in question (mut. formosa E X any form of strain C) would be 

 partially depicted. Since f. typica is represented in such a 

 progeny, it is considered to be the equivalent of mut. formosa. 

 The other equivalents, or analogues, are not well known as yet, 

 since it has been impossible thus far to obtain seeds from them. 

 One of them, however, f. grisea, is assumed to be the equivalent 

 of mut. albicans or mut. revoluta, and another, f. dimorpha, the 

 most abundant of all, the equivalent of mut. setacea, Mut. setacea is 

 not only the most abundant of the revolute forms, as they occur 

 as secondary mutations in the progeny of mut. formosa, but it 



