Sorting and blending of unit characters. 211 



tortuosa are clearly those of nutans, and the petals of pycnella are 

 clearly those of pycnocarpa. The petals of nutella are often very like 

 those of nutans, particularly as regards the plaited characters and 

 oboval form. They are, however, larger than those of nutans. The 

 eraargination is more pronounced showing more of the pi/cnocarpa 

 character. Sometimes the plaited character is not so pronounced, as 

 is evident in the photograph of nutella (n X p). But in many examples 

 the plaited character is very evident. While therefore the petals of 

 this blend hybrid (nutella) more strongly resemble those of nutans they 

 are modified by those of pijcnocarpa, the blend in the petal characters 

 being less striking than in the vegetative characters. 



The rosettes of nutans X pycnocarpa are reproduced in figure 4> 

 those of pycnocarpa X nutans in figure 5. The one in the upper left 

 hand corner of figure 4 is the mother nutans. In the upper right 

 hand corner is the rosette of the Fi blend, hyhrida nutella. The 

 hyhrida nutella rosette of the reciprocal cross (pycnocarpa X nutans) 

 is in the upper right hand corner of figure 5. By a comparison with 

 the rosettes of the parents (the rosette Oe. pycnocarpa in the upper 

 left hand corner of figure 5), the blending of the characters, wideness 

 with narrowness, and cutness with toothedness, is very evident. 



In the lower left hand corner of figure 4 and 5 are the rosettes 

 of the Fl segregate, hyhrida pycnella, the one in figure 4 from the 

 progeny when nutans was the mother, the one in figure 5 when pycno- 

 carpa was the mother. The two have the same composition of character, 

 but the lower one has fewer leaves, selected because the leaf detail 

 could be better represented in the photograph. The photograph shows 

 the selection of the width and toothed character from nutans. Furrow- 

 edness, white veinedness and repandness come from pycnocarpa, but 

 are not shown well in the photograph. At the time the photographs 

 were made furrowedness had not been recognized as a character and 

 considerable effort was made to flatten the leaves down so that the 

 edge characters would appear to better advantage. 



In the lower right hand corner of figure 4 is the Fi segregate hybrida 

 tortuosa. This is yet repesented only from the progeny when nutans is 

 the mother. It has not yet appeared in the cultures of pycnocarpa X 

 nutans. This is quite a remarkable rosette. The larger leaves have 

 the narrowness and cutness of pycnocarpa, the crinkledness and con- 

 vexity of nutans, all these characters being clearly represented in the 

 photograph. It has also the red veinedness of nutans. 



14* 



