28 



BURSA BURSA-PASTORIS AND BURSA HEEGERI : 



The seed of the first of these (040.2) was sown June 6, 1905, and gave 

 a progeny of 262 individuals not quite equal to each other and not then well 

 understood, because these were my first cultures of Burs a. These plants 

 were nearly uniform in their membranous texture, smooth surface, and 

 rather light-green color, but in the character of the lobation considerable 

 differences were noted. The most common form, and that considered in 

 consequence to be typical, had only obtuse lobes resembling B. bp. simplex. 

 Besides these obtuse-lobed specimens there were about 4 which had the 

 lobes decidedly acute or elongated. 



FIG. 19. Bursa bursa-pastoris simplex grown from seeds received from 

 Edgewood, New Carlisle, Ohio. 



Seeds of the other original specimen (040.7) were sown May 8, 1905, and 

 produced 70 offspring, about 40 of which were obtuse-lobcd. The rest 

 varied through acute lobes not elongated, somewhat elongated acute lobes 

 with slight serration on both margins to forms with well-marked attenua- 

 tion of the lobes similar to those of B. bp. tennis described above. Most of 

 my cultures of Btirsa have been made to determine the status of the varia- 

 tions in the offspring of these two plants and their succeeding generations. 



Before taking up the discussion of particular cultures, it may be stated 

 that these variations from obtuse lobes and shallow sinuses to more or less 



