ttl.] 



VALISNEklA. 



S« 



(Fig. 36, a) are borne on long stalks, which reach to the 

 surface of the water, on which the flowers float. The 

 male flowers (Fig. 36, b), on the contrary, have short, 



Fig. 36, — Valisneria spiralis. 

 (*, female flower ; <5, male flower ; c, floating pollen. 



straight stalks, from which, when mature, the pollen 

 (Fig. 36, c) detaches itself, rises to the surface, and, 

 floating freely on it, is wafted about, so that it comes 



E 3 



