102 HETEKOSTYLED DIMORPHIC PLANTS. Chap. III. 



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 themselTCS yielded a sUghtly 

 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 Eildehrand). 



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 



