Rhizanthes is a genus of four species of parasitic flowering plants in the family Rafflesiaceae. They are without leaves, stems, roots, or photosynthetic tissue, and grow within the roots of a few species of Tetrastigma vines. The genus is limited to the tropical forests of Southeast Asia. The flowers of Rhizanthes are very large, they vary from 14 to 43 cm in diameter. At least one species of Rhizanthes, Rh. lowii, is endothermic.

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