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University of California Puhlications in Botany [Vol.5 



red. This bears out our statements as to the difficulty of classifying 

 pink and liglit pink. In the seven populations which produced red 

 flowering plants 38 plants had red flowers and 134 pink or pinkish 

 flowers; again in substantial agreement with the behavior of flower 

 color in the angustifolia-macrophyUa series. The behavior of segre- 

 gants classified as light pink is shown in table 12. Of the four popu- 

 lations from which data w^ere gathered only one bred true to light 



TABLE 11 



Fs BEH.A.VIOR OF PINK SEGREGANTS. 



TABLE 12 



Fa BEHAVIOR OF LIGHT PINK SEGREGANTS. 



pink, one of the others bred true for pink, possibly a slightly darker 

 shade than true light pink, and two segregated for all three colors; 

 they must therefore have been pink heterozygotes. 



In F4 two populations each of Hj^ and of H.„ were grown. Popu- 

 lation ISF^Hj^Po-.P^Pn from an F^ population breeding true for red 

 gave in F4 100 plants all red flowering. Population ISF^Hj.^Po.PuP^ 

 from the same F., population gave 97 plants all red flowering like 

 calycina. Population 13F4H.^nP2pP-Ps, w^hich bred true for pink in 

 F3, gave in F4 96 plants, all pink flowering. These three populations 

 were grown to F. without showing further evident segregation. The 



