556 WHITE— STUDIES OF INHERITANCE IN PISUM. 



noted that white flower color is genetically associated with earliness 

 while colored flowers are associated with late flowering. The asso- 

 ciation is not of an absolute nature in either case, as some of the 

 latest flowering forms such as Spate Gold are white-flowered. None 

 of the earliest varieties, however, have colored flowers, but this may 

 be a coincidence, since varieties with colored flowers have not been se- 

 lected for earliness and early flowering forms may have arisen 

 which remained unnoticed. 



Horticulturists and seedsmen divide varieties of peas on the 

 basis of time of bloom into early, second early, medium, medium 

 late and late. This classification is too general for scientific pur- 

 poses, though of much practical value. 



Varieties Studied. 



Numerous varieties — Tschermak (85). 



Ceylon Native No. i, French Gray Sugar Pea — Lock (54). 



Bountiful, Autocrat — Keeble and Pellew (49). 



Victoria Marrow, various Finnish and Russian Field Peas — Re- 

 lander (66). 



" Early White-flowered Dwarf," " Late French Large-podded," 

 " Mans "— Hoshino (40.5). 



Results from Crossing. 



Crosses of an earlier flowering variety with a later flowering 

 variety generally give an intermediate in F^ in this respect. Re- 

 lander (66), however, finds that if the flowering periods are very 

 close together the F^ blooms at or very near the same time as the 

 earlier flowering parent, but where the blooming periods are far 

 apart, only intermediates are obtained in F^. Keeble and Pellew 

 (49) secured intermediate F/s from crosses of two varieties with 

 flowering periods about a month apart. Li Tschermak's (85) 

 crosses, the F^'s were either intermediate or near the late flowering 

 parent. In one case the F/s were all as late flowering as the* late 

 flowering parent. Li Hoshino's crosses, the F^ was nearest the late- 

 flowered parent. Li all studies of F^ crosses in respect to flowering 

 time, the, numbers have been extremely small, Relander and Hoshino 

 employing the largest. 



