black-eyed Su·san /-ˈsuzṇ/



 Rud·beck·i·a n.  Bot. A genus of composite plants, the coneflowers, consisting of perennial herbs with showy pedunculate heads, having a hemispherical involucre, sterile ray flowers, and a conical chaffy receptacle. There are about thirty species, exclusively North American. Rudbeckia hirta, the  black-eyed Susan, is a common weed in meadows.

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 Black-eyed Su·san. Bot. (a) The coneflower, or yellow daisy (Rudbeckia hirta). (b) The bladder ketmie.

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 black-eyed Susan
      n 1: tropical African climbing plant having yellow flowers with a
           dark purple center [syn: black-eyed Susan vine, {Thunbergia
           alata]
      2: annual weedy herb with ephemeral yellow purple-eyed flowers;
         Old World tropics; naturalized as a weed in North America
         [syn: flower-of-an-hour, flowers-of-an-hour, {bladder
         ketmia, Hibiscus trionum]
      3: the state flower of Maryland; of central and southeastern
         United States; having daisylike flowers with dark centers
         and yellow to orange rays [syn: Rudbeckia hirta, {Rudbeckia
         serotina]