网页Tâi-lô. lîng-gíng. Dimocarpus longan, commonly known as the longan (/ ˈlɒŋɑːnˈ /) and dragon's eye, is a tropical tree species that produces edible fruit. [ 3 ] It is one of the better-known tropical members of the soapberry family Sapindaceae, to which the lychee and rambutan also belong. [ 3 ]