Seedling of Mucuna (Leguminosae) from sea-borne seeds were found on the coast of western Kyushu, Japan. To identify the species name of their seedlings, leaf characters of three Mucuna species, M.gigantea, M.sloaneiand M.macrocarpa, were studied by observation on plants grown using the seeds collected. Seeds of these species were known to be drifted ashore on the coast of Japanese mainland. The leaves of these species were found to be distinguishable from each other in terminal leaflet, lateral vein, hair on leaf and stipel. Six seedlings of Mucuna from seaborne seeds were found on the beach in Nagasaki Prefecture, western Kyushu from 2008 to 2018. Of these, 5 were found to be M.gigantea and 1 was M.sloanei.
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