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mistletoe, any of many species of parasitic plants, several of which are associated with Christmas for their green foliage and attractive fruits. Mistletoes are found in the families Loranthaceae, Misodendraceae, and Santalaceae, the latter containing the well-known members in the genera Viscum, Phoradendron, and Arceuthobium. Most mistletoes are able to parasitize a variety of hosts, and some species even parasitize other mistletoes, which in turn are parasitic on a host. They are usually evergreen and...