24 



BURSA liUKSA-PASTOKIS AND liUKSA II KK01KRI : 



The second of two original plants of /?. /;/>. rhomboidca (040.8) produced 

 330 offspring, all but 5 of which possessed characters recognized as prop- 

 erly belonging to the parental type, namely, distinct obtuse lateral lobes, 

 usually with an incision on the distal margin and sometimes with a similar 

 incision on the proximal margin (fig. 16). The 5 individuals which were 

 aberrant from the type of the other 325 had the essential characters of B. 

 />/>. hctcris. As will be seen later, /if ten's is dominant over rhomboidca, and 

 the simplest explanation of the presence of these 5 specimens of hctcris in 



FIG. 15. Bursa bursa-pastoris rhomboidea. Grown in nearly saturated air 

 and moderate illumination. Leaves very thin and translucent. 



a family of rhomboidca is the supposition that they represent chance crosses 

 between these two biotypes. 



Another culture which was not at first thought to be referable to B. />/>. 

 rhomboidea was raised from seeds of a plant (050.82) growing- in a door- 

 yard near Cold Spring Harbor, Long Island. The parent had rather small 

 leaves with crowded lobes and coriaceous texture. The lobes had a strongly 

 marked distal incision and rarely a slight proximal incision (fig. 17). This 

 plant was removed to the greenhouse April IS, 1906, and the flowers were 



