12 



AQUATIC PLANTS IN POND CULTURE. 



makes also a good aquarium j^lant. 

 and reachinff to the surface. 



Found in 2 to 5 feet of water, 



Fig. 5. — Curled-leaved pondweed {Potamogeton crispus). Found in fresh, brackish, or 

 even salt water, Massachusetts to Pennsylvania and Virginia. Also in Europe. (After 

 Britton & Brown.) 



Another Potamogeton (foUosus), the leafy pondweed, also good as 

 a food producer, oxygenator, and for shelter, is found in 2 to 4 feet of 



Fig. 6. — Leafy pondweed (Poiamogeton foliosus). Niagara Falls to Michigan and Cali- 

 fornia. (After Britton & Brown.) 



water, extending to but not above the surface. This plant comes 

 fourth in the estimation of the superintendent. 



