in Morphology of Flowering Plants by

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Mangrove tree that flourish in tropical tidal zones has a PNEUMATOPHORES (RESPIRATORY ROOTS) SYSTEM.

In this structure many roots come out of the ground and grow vertically upwards helping to get oxygen for respiration (exchange of oxygen and carbon dioxide for the roots).

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ans given by sulekha shah is correct..  and mangroves roots, they exhibit viviparous germination too !
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