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Cuscuta species are parasitic on the above-ground parts of other plants. The parasites consist of a twining stem that lacks leaves and has no roots. They are dependent on the host plant for organic and inorganic solutes that they extract by means of haustoria, primarily from the host phloem (12). (A) C. reflexa growing on a Coleus host and (B) a close view of the host–parasite attachment with C. reflexa attached by haustoria to the stem of Coleus.
