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Which plant has the largest single flower among Rafflesiaceae species?
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Malpighiales
Weeping willow (Salix babylonica).
Within the family Rafflesiaceae, which is classified under the order Malpighiales, the plant with the largest single flower is Rafflesia arnoldii.12
Often referred to as the corpse flower or monster flower, this species produces the largest individual flower of any plant in the world. Found in the forested mountains of Sumatra and Borneo, its fully developed flower appears as a thick, fleshy, five-lobed structure that can weigh up to 11 kg (24 pounds) and measure nearly one meter (about one yard) across.12