AQUATIC PLANTS 



191 



the root end unless the stock has become quite old and no longer 

 prospers. Does best in strong light and may also be propagated in 

 the aquarium from cuttings. A little Ludwigia can be seen in our 

 illustration of a concrete aquarium. (Page 6.) 



SPATTERDOCK 



Among the newer introductions into the aquarium are the sub- 

 merged Spatterdocks. The large arrow- or spade-shaped leaves make 



Fig. 174. Southern' Spatterhock {Half sicc) 



a very characteristic appearance. Seedling plants gathered from 

 lakes and ponds in the fall will do well in the aquarium over winter. 

 If summer leaves appear and become too large for the aquarium the 

 plant had best be removed. The Southern Spatterdock, Nnphar 

 sagittcefolia, does not develop aerial leaves, but they gradually lengthen 

 as the warm season progresses. The illustration shows the plant in 



