Heredity Studies in the Morning-Glory 27 



26 dark purples, i light purple, and 15 dark blues (some of which may 

 have been light purples). It should be noted that in all cases both parents 

 were duplex for B, because no types of the red series made their appearance 

 in the F2 progeny. 



Since the dark blue type lacks the intensifying gene I, this gene would 

 be expected to be simplex in the Fi plants, altho still potent enough, 

 with the other genes all intact, to produce the dark blue pigment. If the 

 dark blue parent is simplex for B or for X, the gene I will not be able to 

 produce its full effect and some light purples will result. 



FLAKING 

 (Plates II and III) 



description of the character 



The character designated as flaking is manifested on the corolla in the 

 form of stripes running parallel from the throat and the rays of the star 

 to the edge of the corolla. These stripes are usually narrow, but may 

 in some cases vary to such width that they constitute a segment of color. 

 In such cases the segment may in turn exhibit stripes of a still deeper 

 hue. On a white corolla the flakes may be pink, mauve, magenta, light 

 blue, dark blue, or purple. The deeper and the lighter saturations of 

 the same hue may lie side by side in the same segment. On a colored 

 corolla the flaking is of a deeper saturation of the same hue as the 

 background. 



The whites referred to in this section have all been extracted from 

 the three original flaked plants and are not the same as the plain whites 

 treated in the other sections of this paper. They are a decided cream 

 white (page 10, shade 3, in the Repertoire de Couleurs ^) . This color forms 

 the ground on which the flaking is displayed in the white flaked flowers, 

 and in the unflaked ones it is found pure (Plate II). 



The seat of the flakes is in the cell sap of the epidermis of the inner 

 side of the corolla. This character, as studied in the writer's cultures, 

 is dominant over the unflaked condition. 



Miss Marryat (1909:45), working with four-o'clocks {Mirabilis jalapa), 

 found that flaking proved to be dominant thruout but could offer no 

 satisfactory explanation for it. Correns (1910:424), working with the 

 same species, reported flaking to be dominant. It is a recessive character 

 in Antirrhinum according to Miss Wheldale (1909 a: 8). 



Flowers characterized by localization in flakes or spots of such color 

 as they may have, are very common among cultivated plants, for example, 



6 See under Sociele Franqaise des Chrysanlhe'misles et Rene Oberthur, in Rrferenci's cited, page 38. 



