Key to Tasmanian Dicots
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Elodea (Hydrocharitaceae) 4b:8    
Elodea canadensis (Canadian pondweed) is a commonly cultivated species of fishponds and aquaria, but has escaped to become a common and troublesome aquatic weed of ponds and streams in Tasmania. It grows submerged, and forms a tangled mass of stems. The leaves are soft and in whorls of three (two on lower branches). It resembles its relative Egeria densa, but has thinner stems and smaller leaves and flowers.
 

 
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