AQtTATiC PLANTS IN POND CtJLTtJKE. 



13 



The wild celery, or eel grass {Vallisneria spiralis), is found to be a 

 good oxygenator, and is a desirable plant because of its early growth. 

 It is also good for shade and shelter, and is an excellent aquarium 



Fig. 7. — Wild celery, or eel-grass (Vallisneria spiralis). In quiet waters, New Brunswick 

 to Florida, west to Minnesota, Iowa, and Texas. (After Britton & Brown.) 



plant. It is found in 2 to 4 feet of water, extending to but not above 

 the surface. 



Fig. 8.- 



-Slender Naias [Naias flewilis). Found in ponds and streams throughout nearly all 

 North America. (After Britton & Brown.) 



The slender Naias {Naias flexilis), Avhich is a good food producer, 

 is good for shelter, and is regarded as a fair oxygenator, is somewhat 

 ornamental and a fairly good aquarium plant. 



