THE PROBLEM OF SEX IN PLANTS 



349 



Fig. 256. — Bryopkyllum crenatum. A leaf which has given rise to three 

 plantlets along the margin of the blade. 



Fig. 257. — Eel-grass (VaUisneria spiralis), showing vegetative propaga- 

 tion by stolons. Young plants at P' and P^. 



