Shull 



Plate 2 



06130 



06130 



Fig. 1. Bursa bursa-pastoris rhomboidea. Dominant form in the F 2 of a hybrid family repre- 

 senting the natural cross, B. bp. simplex X rhomboidea. The parent was a sib of the plant 

 shown in text- figure 20 and had the same characteristics. 



Fig. 2. Bursa bursa-pastoris simplex. Recessive form in the same hybrid family whose dominant 

 form is represented by figure I. 



