Breeding experiments which show that hybridisation and mutation etc. 220 



As I have explained elsewhere (Gates, 1913 c), grandiflora reacts 

 quite differently in the two climates, though its presence in hybrids 

 has the same effect in all cases, namely, to increase their "earliness" 

 or rate of development. Pure grandiflora, however, in the climate of 

 Missouri, shoots up a slender stem very early, and begins blooming 

 long before the Lamar ckiana races. In the English climate also stem 

 formation begins early, and large leafy plants are formed, but flower- 



Fig. 12. Fl rosette, grandiflora X rubric alyx. 



production is entirely inhibited, at least under certain conditions of 

 culture, until the very end of the season. 



The Fl of grandiflora x ruhricalyx (culture No. — ) contained 



147 plants, which were uniform as regards their morphological features. 

 Figs. II and 12 show two of these rosettes photographed on July 5 

 and July 14 respectively. They are intermediate between the parents 

 in many respects (cf. figs. 2 and 8), but nearer ruhricalyx. The amount 

 of crinkling varied but was in some cases as great as in the male parent. 

 Further, red blotches (a grandiflora character) did not develope on 



