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Loranthaceae A family composed of small shrubs that are partially parasitic on trees, with opposite or whorled, entire leaves, and unisexual regular flowers, usually with 2-perianth whorls. The ovary is inferior, the fruit a berry. Viscum (mistletoe) has tiny tetramerous flowers and white berries. In modern classifications there are some 70 genera, with 940 species. They are mostly tropical, but some are temperate.