Characteristics and efficacy of Schizandra. There are 25 species of omija in two genera in the world, and in our country there are deciduous vines, omija, and Kadsura japonica (L). There are three species in the family Dunai. It is included in the magnolia family, but it contains refined oil and has no alkaloids, which makes it different from magnolia. Its stem is brownish and grows into vines a..