Mendel's law of heredity and horticulture. 



35 



L representing magenta tingeing in the lips. 

 T representing magenta tingeing in the tube. 



D representing intensification of the magenta colour in the hps 

 and tube. 



The presence and absence of these five factors in various combina- 

 tions and in their varied relations and interactions have given rise to 

 the numerous colour-forms of the modern snapdragon, now so familiar 

 in gardens. The following table will illustrate this so far as the five 

 factors are concerned: — • 



Factorl\l Table for Flower Colours in the Snapdragon 



(A ntirrliin um m ajus). 

 YILTD Self-coloured magenta lips and tube (e.g. wild form, 

 Carmine King). 



YILT Ivory lips and tube tinged with magenta. 

 YILD Magenta lips and ivory tube (e.g. Delila). 

 YITD Ivory lips and tube. 



YLTD Crimson lips and magenta tube (e.g. Crimson King). 

 ILTD Pure white. 



Ivory lips tinged with magenta, and ivory tube. 

 Ivory lips and tube. 



Yellow lips and ivory tube tinged with magenta. 

 Crimson lips and ivory tube. 

 Yellow lips and ivory tube (e.g. Yellow Prince). 

 Pure white. 



Ivory lips and tube. 



Yellow hps tinged with crimson, and ivory tube. 

 Yellow lips and ivory tube (e.g. Yellow Prince). 



Pure white. 

 ) ) ) > 



> ) ? ? 



) ) 5 5 



5 5 5 5 



Yellow lips and ivory tube (e.g. Yellow Prince). 

 Pure white. 



5 5 5 5 



5 5 5 5 



5 5 5 5 



All absent Pure white. 



fore that the striping is due to the absence of a factor for uniform colour (say 

 U) and that in the wild form this factor U is present together with D. 



D 2 



YIL 

 YIT 

 YID 

 YLT 

 YLD 

 YID 

 ILT 

 ILD 

 ITD 

 LTD 



YI 

 YL 

 YT 

 YD 

 IL 

 IT 

 ID 

 LT 

 LD 

 TD 



Y 

 I 

 L 

 T 

 D 



