Crinum asiaticum var. japonicum is one of the most famous maritime plants in Japan. Studies on the distribution of this species have been made by many authors, but its ecology has scarcely been described. This study was carried out to obtain ecological and phytosociological information on Crinum asiaticum var. japonicum community. This community usually develops on the stable sandy or shingly coast with some amount of organic matter. As a result of the investigation, a new association including two subassociations was described.
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