(Sanguinaria canadensis), plant of the poppy family (Papaveraceae), native throughout eastern and midwestern North America. It grows in deciduous woodlands, where it blooms in early spring. Bloodroot has a shining white, eight-petalled, cup-shaped flower with bright yellow stamens (male reproductive structures) in the centre. The 4- to 6-centimetre (2-inch) flower is borne on a 20-cm reddish stalk. Large, veiny, half-opened leaves on red stalks enfold the flower stem; after the flower has bloomed, these open into much-lobed, blue-green, round leaves. The orange-red sap, formerly used by the Indians for dye, is found in the horizontal rootstocks (rhizomes), which also contain the medical alkaloid sanguinarine. Demand from the natural-food industry for Sanguinaria has depleted wild populations of the plant, though it is also considered toxic.