Dwarf mistletoe grows on many pine trees in the Rockies. Although the mistletoe is green, it is probably not sufficiently active in photosynthesis to produce all the sugar it needs. The mistletoe also produces haustoria. Thus, dwarf mistletoe growing on pine trees is best classified as

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Dwarf mistletoe is not capable of producing all the sugar it needs through photosynthesis and therefore must obtain nutrients from the host plant, making it a parasite.

Dwarf Mistletoe Grows on Many Pine Trees in the Rockies