Key to Tasmanian Dicots
Posidonia (Posidoniaceae) 4b:24  
Posidonia australis (seagrass) is moderately common sea grass, found below high-tide level in northern Tasmania. The leave are flattened, up to 60 cm long and 5-10 mm wide, parallel-sided, arranged in two rows up the stem and with a more-or-less rounded apex.

Other genera of seagrasses include Amphibolus, Halophila and Posidonia.


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