May apple

  1. a perennial woodland plant (Podophyllum peltatum) of the barberry family, with shield-shaped leaves and a single, large, white, cuplike flower, found in the E U.S.
  2. its edible yellow fruit

See May apple in American Heritage Dictionary 4

noun In both senses also called mandrake.
  1. A rhizomatous plant (Podophyllum peltatum) of eastern North America, having a single, nodding white flower and oval yellow fruit. Although the pulp of the ripe fruit is edible, the roots, leaves, and seeds of the plant are poisonous.
  2. The fruit of this plant.
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