Aquarium Plants 87 



Once introduced in the aquarium it will mul- 

 tiply rapidly. The fishes eat it freely, pos- 

 sibly not so much for its own sake as for 

 the amount of animal substance attached to 

 it. 



Three-leaved Duckweed (Lcmna trisulca) 

 grows all over the United States, but not 

 so commonly as does Lemna minor. It is, 

 however, of greater decorative value than 

 the former. The leaves are oblong, pointed 

 on both ends and grow cross fashion at right 

 angles to each other, presenting an unusual 

 appearance. Without much trouble both 

 Lemna can be renewed in spring from out- 

 side waters, but it is not difficult to hibernate 

 a few of the little plants, thereby securing 

 an early and generous supply for the aqua- 

 rium. 



Floating Salvinia {Salvinia natans ) is a na- 

 tive of Europe, but is sometimes found in 

 the southern United States. It is a water 

 fern and one of the finest of our floating 

 plants. It has two kinds of leaves, those 



