No. 568] X CAPSELLA BURSA-PASTOR1S A U AC IIS OWE A 231 



terest in connection with Cupsrlla tnaclnioidea, since 

 many of the plants which do not show a fasciated stem 

 do show split leaves ( Fig. 20) and a most peculiar whorl- 

 ing of the flowers (Fig. 21). 



The spatulate condition of the leaves of the seedling 

 shown in Fig. 2 is believed to have been due to fasciation. 



Capsella Bur sa-past oris arachnoidea, then, bears all the 

 earmarks of a fasciated race. All of the three zygotic 

 combinations which yield the arachnoidea type are homo- 

 zygotic for A r . The recent work of East and Hayes, and 

 of Emerson on Zea Mays haa shown that the fasciated 



