Parasitic plants.
Mistletoe, a photosynthetic parasite. Mistletoe (genus Phoradendron) lives as a parasite on oaks and other trees. Dodder, a non-photosynthetic parasite. Dodder (genus Cuscuta), the orange "strings" on this pickleweed, extends haustoria into the host's phloem and absorbs nutrients from the vessel. Indian pipe, a non-photosynthetic parasite. Monotropa uniflora absorbs nutrients from fungal hyphae of mycorrhizae of host plants.