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black-eyed Susan, Rudbeckia hirta, Rudbeckia serotina | the state flower of Maryland; of central and southeastern United States; having daisylike flowers with dark centers and yellow to orange rays | |
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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; naturalized as a weed in North America | |
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black-eyed Susan, black-eyed Susan vine, Thunbergia alata | tropical African climbing plant having yellow flowers with a dark purple center |