ATKINSON— TWIN HYBRIDS. 139 



4. Leaves broad, dark green, white-veined, 5. 



5. Leaves narrow, pale or yellowish green, pink-veined, 6. 



6. Leaves narrow, dark green, pink-veined, 2. 



Series No. 156, F2 of pycnocarpa type {frany^ pycno). Li the 

 splitting between the 43 plants in this culture there were 4 of the 

 pycnocarpa type and 39 of the franciscana type. The groups of 

 variation in the franciscana type, with the number of rosettes in 

 each group, are as follows : 



1. Leaves broad, dark green, crinkled, pink-veined, 4. 



2. Leaves broad, dark green, white-veined, 16. 



3. Leaves medium broad, dark green, white-veined, 15. 



4. Leaves narrow, pale green to yellowish, pink-veined, 3. 



5. Leaves medium broad, pale green, white-veined, i. 



Series No. 158, F2 of franciscana type (pycno 'Xfran). There 

 is no splitting of the franciscana twin in the Fo. There were 67 

 plants in the culture. The groups of variations in the rosettes of the 

 second generation of the franciscana twin, with the number of 

 rosettes in each group, are as follows : 



1. Leaves broad, dark green, pink-veined, 9. 



2. Leaves broad, dark green, white-veined, 14. 



3. Leaves narrow, dark green, wdiite-veined, 13. 



4. Leaves medium broad, dark green, white-veined, 25. 



5. Leaves narrow, pale green or yellowish olive green, 3. 



6. Leaves narrow, pale green, pink-veined, 2. 



Considerable fluctuating variations were presented by the rosettes 

 of the pycnocarpa types in the Fo of the reciprocal crosses. Parallel 

 fluctuations undoubtedly occur in the rosettes of the F^ of the two 

 types of hybrids in the reciprocal crosses, but as the F^ plants 

 grown were nearly all annuals the number of rosettes was not 

 sufficient for a study of these variations in the first generation. 

 Since the rosettes of CEnothera pycnocarpa are very uniform, the 

 pronounced fluctuating variations in the hybrids of the crosses be- 

 tween pycnocarpa and franciscana are traceable to the constitution 

 of (E. franciscana, for the fluctuating variations in the rosettes of 

 the franciscana hybrid type are parallel with the fluctuating varia- 

 tions in the rosettes of franciscana itself. In the 1916 cultures, 135 

 rosettes of CE. franciscana were grown in the garden as a parallel 



