Orobanche flava on Petasites hybridus (large leaves). Both
species are introduced to Denmark.
Photo: H S Heide-Jørgensen
Heide-Jørgensen H S, 2011. Parasitic plants. In: Simberloff, D
and M Reymánek (eds.). Encyclopedia of biological invasions. Univ.
Calif. Press, Berkeley and Los Angeles.
Parasitic flowering plants exploit other flowering plants for water
and nutrients with the help of one or more haustoria. Part of the haustorium,
the intrusive organ, penetrates host tissue to establish contact with
the conductive tissue of the host. Introduced parasitic plants occur
throughout the world and some are considered invasive. They often cause
considerable economic damage when attacking monocultures in agriculture,
orchards, and forestry, and much effort is done to avoid and control
invasive, harmful parasitic plants.
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