black-eyed susan

(noun) tropical African climbing plant having yellow flowers with a dark purple center. Synonyms: black-eyed Susan, black-eyed Susan vine, Thunbergia alata.

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

(noun) the state flower of Maryland; of central and southeastern United States; having daisylike flowers with dark centers and yellow to orange rays. Synonyms: black-eyed Susan, Rudbeckia hirta, Rudbeckia serotina.