Shull 



Plate 1 



Fig. 1. Bursa bursa-pastoris heteris. Dominant form from the p2 of an artificial cross of B. bp. 



heteris X tenuis. The grandparents were sibs of the plants shown in text- figures 4 and 9. 

 Fig. 2. Bursa bursa-pastoris tenuis. Recessive form from the same family as the plant shown in 



figure 1. 



