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Noun: flower-of-an-hour
  1. Annual weedy herb with ephemeral yellow purple-eyed flowers; Old World tropics; naturalized as a weed in North America
    - flowers-of-an-hour, bladder ketmia, black-eyed Susan, Hibiscus trionum

Derived forms: flower-of-an-hours

Type of: hibiscus

Encyclopedia: Flower-of-an-hour