102 HETEKOSTYLED DIMOEPHIC PLANTS. Chap. IIL 



70 per cent.) had set fruit, yielding 1"86 seed per 

 fruit. So that the short-styled plants produced many 

 more flowers, and these set a rather larger proportion 

 of fruit, but the fruits themselves yielded a slightly 

 lower average number of seeds than did the long- 

 styled plants. The results of Hildebrand's experiments 

 on the fertility of the two forms are given in the fol- 

 lowing table : — 



Table 19. 

 Pulmonaria officinalis {from Hildebrand). 



Short-styled flowers, by pollen of long-V 

 styled. Legitimate union . . . ./, 



16 



14 



1-57 



Short-styled flowers, 11 by own pollen,! 



14 by pollen of other plant of samel! 25 

 form. Illegitimate union .... J I i 



In the summer of 1864, before I had heard of Hilde- 

 brand's experiments, I noticed some long-styled plants 

 of this species (named for me by Dr. Hooker) growing 

 by themselves in a garden in Surrey; and to my 

 surprise about half the flowers had set fruit, several 

 of which contained 2, and one contained even 3 seeds. 

 These seeds were sown in my garden and eleven 

 seedlings thus raised, all of which proved long-styled, 

 in accordance with the usual rule in such cases. Two 

 years afterwards the plants were left uncovered, no 



