Genus Rhizophora
Three species of mangrove "seeds", or more properly, named "propagules" are often found within the beach wrack line. Mangroves have a unique method of reproduction. Their propagules sprout and start embryonic development while still on the tree, unlike other flowering plants that disperse dormant seeds. The developing propagules are released from the tree to be transported by water.
Red Mangroves produce an approximately six inches long, ½ inch diameter propagule. It must remain in the water for about 40 days to continue development. They are viable in salt water for a full year. They float, then find a suitable shoreline landing point where the propagule will “stand” lodged upright for a period of 15 days before they sprout roots and leaves.
Black Mangrove propagules are about 1 inch long, must remain in water or wet mud for 14 days, are viable for 4 months and sprout after standing for 7 days.
White Mangrove propaagules are smaller at about ½ inch, sprout after they fall from the tree, must remain in the water or more tpically, mosit soil for 8 days, are viable for one month and sprout after standing for 5 days.
These should never be taken from any Florida State Park.