COBB AND BARTLETT: INHKRITANCS IN OENOTHERA 



467 



part new, in part assembled from a former publication (see foot- 

 note 2). The points brought out are: 



(a) The essential similarity of the progenies of mut. formosa, 

 when used as a seed parent, regardless of whether the pollen is 

 derived from f. typica, mut. latifolia, or mut. formosa. 



(b) The failure of pollen from different sources to influence 

 the composition of progenies from the same f. typica seed-parent. 



(c) The stability in the F2 generation of f . typica derived from 

 the cross f. typica X mut. formosa. It will indeed be observed 

 that mut. formosa occurs in the progeny, but in no greater num- 

 bers than one might expect as a result of mutation. 



TABLE I 

 CuiyTURE Records Illustrating the Equivalence of the Pollen in f. typica, 

 MUT. latifolia, and mut. formosa, when these are All Derived from the 

 Strain of Oenothera pratincola Designated as Lexington E 



^ Lex. E-5 -217 /v^zca. ^ hex. ^-5-229 typica. ^ Lex. 'E-5-206 formosa. '^ Lex. 

 E-5-199 formosa. ^ Lex. E-5-199-28 formosa. ^ Lex. E-5-199-58 formosa. 

 ^ Lex. E-5-(229 typica X 206 formosa)--] typica. ^ Lex. E-36-41 latifolia. 



For the pedigrees of all of these plants, consult Bot. Gaz. 60: 425-456. 1915- 



In table 2 are presented the data in regard to the Fi genera- 

 tion of the crosses between strains K and C, with mut. formosa 

 as the pistillate parent. Further crosses are being made, but 



