black-eyed Susan

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. Any of several North American herbs of the genus Rudbeckia in the composite family, especially R. hirta, having hairy stems and leaves and showy flower heads with orange-yellow rays and dark purple or brown centers.
2. n. A tropical African twining herb (Thunbergia alata) cultivated for its showy, usually yellow to orange tubular flowers with dark purple centers.

Century Dictionary and Cyclopedia

1. One of several plants having flowers or heads with a dark center. One of these is Flemingia alata (see Thunbergia); another the flower-of-an-hour, Hibiscus Trionum; a third, Rudbeckia hirta (see Rudbeckia).

Wiktionary

1. n. A flowering annual plant Rudbeckia hirta; the state flower of Maryland.

GNU Webster's 1913

1. The coneflower, or yellow daisy (Rudbeckia hirta).
2. The bladder ketmie.

WordNet 3.0

1. n. annual weedy herb with ephemeral yellow purple-eyed flowers; Old World tropics; naturalized as a weed in North America
2. n. tropical African climbing plant having yellow flowers with a dark purple center
3. n. the state flower of Maryland; of central and southeastern United States; having daisylike flowers with dark centers and yellow to orange rays