Answers. Best Answer: Rafflesia is a genus of parasitic flowering plants. Rafflesia plants have no stems, leaves or true roots. They are endoparasites of vines in the genus Tetrastigma (Vitaceae), spreading their absorptive organ, the haustorium, inside the tissue of the vine.The only part of the plant that can be seen outside the host vine is the five-petaled flower.This is NOT a symbiotic relationship. It IS a parasitic relationship. Source(s): http://en.wikipedia.org/wiki/Rafflesia.hey are endoparasites of vines in the genus Tetrastigma (Vitaceae), spreading their absorptive organ, the haustorium, inside the tissue of the vine. The only part of the plant that can be seen outside the host vine is the five-petaled flower. This is NOT a symbiotic relationship.