Often used as a symbol of renewal because it stays green all winter, mistletoe is famed for its stolen-kisses power. But the plant also is important to wildlife, and it may have critical value for humans, too. Extracts from mistletoe have been used in European research studies as a tool in the fight against cancer.
The National Wildlife Federation presents these mistletoe facts that offer a new respect for the parasitic plant:
There are 1,300 mistletoe species worldwide. The continental United States and Canada are home to more than 30 species, and Hawaii harbors another six.
Globally, more than 20 mistletoe species are endangered.
All mistletoes grow as parasites on the branches of trees and shrubs. The genus name of North America's oak mistletoe — by far the most common species in the eastern United States — is Phoradendron, Greek for “tree thief.”
Ancient Anglo-Saxons noticed that mistletoe often grows where birds leave droppings, which is how mistletoe got its name: In Anglo-Saxon, “mistel” means “dung” and “tan” means “twig,” hence, “dung-on-a-twig.”
Mistletoe produces sticky seeds that can attach to birds and mammals for a ride to new growing sites. The ripe white berries of dwarf mistletoe, native to the western United States and Canada, also can explode, scattering seeds as far as 50 feet.
When a mistletoe seed lands on a suitable host, it sends out roots that penetrate the tree and draw on its nutrients and water. Mistletoes also can produce energy through photosynthesis in their green leaves.
As they mature, mistletoes grow into thick, often rounded masses of branches and stems until they look like baskets, sometimes called “witches' brooms.”
Trees infested with mistletoe die early because of the parasitic growth, producing dead trees useful to nesting birds and mammals. A mistletoe-infested forest may produce three times more cavity nesting birds than a forest lacking mistletoe.
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