Fig. 74:, a-f, Elodea longivafyinata: a, habit, X Vo; b, young staminate flower and 

 spathe, X 3; c, mature staminate flower, X 3; d, mature capsule, X 3; e, seeds, X 3; f, 

 leaf, X 21/2. g, Elodea Nuttallii: g, leaf, X 21/2. (V. F.). 



