Key to Tasmanian Dicots
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Lagarosiphon (Hydrocharitaceae) 4b:9    
Lagarosiphon major is a commonly cultivated species of fishponds and aquaria, but can escape to become a troublesome aquatic weed of ponds and streams. It grows submerged, and forms a tangled mass of stems. The stems are brittle and 2-3 mm in diameter (distinctly wider than its relatives Egeria densa and Elodea canadensis). The leaves are alternate and stiff.
 

 
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