The term 'tropical drift-seed' is used by botanists to refer to any fruit and seed which has the ability to float for a long time in water. Two categories of drift-seeds are found in the tide marks on the beach: the 'true long-distance drift-seeds' (wild species) and the 'refuse' species (result of human activity). Some seeds from Tropical America can reach the coast of Europe with the help of wind and the Gulf Stream and North Atlantic Current. Seven species of drift-seeds have been recorded up to now along the French coast, which is few compared with the fifty-five species recorded from the rest of Europe.
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