Aconite

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Aconitum is a potion ingredients belonging to the buttercup family ( Ranunculaceae). There are over 250 species of Aconitum, which are known as aconite, monkshood, or wolfsbane. Scott Cunningham's Encyclopedia of Magical Herbs informs us that a folk name for the highly poisonous Wolf's Bane is "Dumbledore's Delight".