Fig. 448: Ceratophyllum demersum: a-c, stamens at various stages of development, 

 X 8; d, staminate flower, the involucre calyxlike, x 4; e, node with leaves, branches and 

 a pair of staminate flowers arising on opposite sides of stem, x 4; f, node with leaves, 

 branches and solitary pistillate flower, x 8; g, mature fruit, the basal spines recurved, 

 X 6. (From Mason, Fig. 230). 



