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black-eyed Susan, flower-of-an-hour, flowers-of-an-hour, bladder ketmia, Hibiscus trionum | annual weedy herb with ephemeral yellow purple-eyed flowers; Old World tropics; annual weedy herb with ephemeral yellow purple-eyed flowers; Old World tropics; naturalized as a weed in North America ❲Hibiscus trionum❳ |