True mangrove trees grow in tropical, inter-tidal areas and have the unique ability to survive a daily flooding with salt water that would spell death for other trees. Mangroves need to be able to cope with both sea water and freshwater. To do this, arching stilt-roots lift the plant out of the salty water and various clever methods are employed to either filter out or exclude the salt. The seeds of these mangroves germinate whilst still on the plant, before falling from the tree and floating away on the tide, which makes them viviparous plants.

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