v.] 



BO RAGING. 



139 



were fertilised with pollen of the same form. (Jour. 

 Linn. Soc., v. x. p. 430.) We have already seen that 

 this is partially the case with other dimorphous species. 

 The genus Myosotis (the Forget-me-not) has 

 already been alluded to in the introductory chapter 

 (anti, p. 35). The species, however, appear to differ 

 among themselves in the relative positions of the 

 stamens and pistil. 



FIG. 96. Pultnonaria ojfficinalis. 



In this beautiful and interesting family, though we 

 have not above twenty British species, we find, as 

 Miiller has well pointed out, the widest differences in 

 the conditions of fertilisation. Pulmonaria ojfficinalis 

 is dimorphous, and sterile not only with its own 

 pollen, but even in some cases with that of a different 

 flower, unless it belongs to the different form. Echium 

 vulgare has lost the power of self-fertilisation, but, so 



