The defining feature of parasitic plants is the presence of a haustorium. The concept of a haustorium is broadly defined as a structure formed by the parasite to connect it physiologically to its host a morphological / physiological bridge. The haustorial organ may be a simple outgrowth and proliferation of tissue or it may be an elaborate, highly organized structure. Its appearance is often a useful diagnostic feature. Typically, the haustorium serves three functions: to attach the parasite to the host (adhesion), to penetrate into the host tissue or even into individual host cells (intrusion), and to conduct water and nutrients from the host to the parasite.
See also: Fungal Parasites, Angiosperm Parasites, Origin of Parasitism
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