Fig. 73: a-d, Egeria densa: a, stem with whorls of lanceolate leaves, showing their 

 minutely serrate margins, X 1%; b, spathe and the flowers, X P^; c, habit, showing 

 long-peduncled staminate flowers, X %; d, staminate flower, X 2. e-g, Elodea canaden- 

 sis: e, obovoid-clavate spathe with staminate flower on long thread-like peduncle, X 4; 

 f, habit, the staminate flower at the surface of the water in anthesis, X %; g, mature 

 staminate flower, showing the 9 anthers and 3 rudimentary stigmas, X 5. (From Mason, 

 Fig. 53). 



