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Vallisneria Americana (Vallisneria gigantea) occurs naturally in Iraq, China, Japan, Korea, India, Papua New Guinea, the Philippines, Australia, Canada, the United States, Mexico, Guatemala, Honduras, Cuba, the Dominican Republic, Haiti and Venezuela.Vallisneria gigantea blooms all year and occurs almost always (estimated probability 99%) under natural conditions in wetlands. Long, flattened, ribbon-like leaves arising from a cluster at the base of the plant are minutely serrate with bluntly rounded tips. Leaves grow to 1.5m (5 feet) in length and approximately 1cm (0.4 inch) width. A light green stripe runs down the center of the finely-veined leaves.