No. 568] X CAPSELLA BURSA-PASTORIS ABAC EN OWE A 207 



formed. However, the end of the lobes of early 

 leaves of type 4 always are sharply pointed (Fig. 9), 

 while the lobes of early leaves of rhomhoidva are ordi- 

 narily rounded at the ends (Fig. 4). 



From a morphological point of view these leaves are 

 entirely different from any form described by Shull, the 

 differences being most marked and very readily recog- 

 nized once our attention has been called to them. But it 

 is especially the behavior of the plants on breeding which 

 leads me to recognize them as most distinct hybrid forms 

 and which J have designated X Capsella Bursa-pastoris 

 Setchelliana in honor of Professor William Albert 

 Setchell, and X Capsella Bursa-pastoris Treleaseana, in 

 honor of Professor William Trelease. 



Type 5.~Capsella Bursa-pastoris arachnoidea. This 

 form, which readily is recognized from the first by its 

 linear leaves, does not require an elaborate description 

 at present, since it will be discussed in detail later. It has 

 been illustrated in Figs. 1, 2 and 3. 



