A chemical method of distinguishing genetic types of yellow rones in Rudbeckia. 219 



Table 6. 

 Rudbeckia hirta. Crosses between Black Yellows and Red Yellows. 



a) Fl Generation. 



c) Back Crosses with Red Yellows and Black Yellows. 



^) No RY expected. There are 243 BY to 1 RY. 



