any plant of the North American genus Rudbeckia, cultivated for their showy flowers, which have golden-yellow rays and green or black conical centres: family Asteraceae (composites)
See also coneflower, black-eyed Susan
Word origin
C18: New Latin, named after Olaus Rudbeck (1630–1702), Swedish botanist
rudbeckia in American English
(rʌdˈbɛkiə)
US
noun
any of a genus (Rudbeckia) of perennial North American plants of the composite family, with conical disks and showy yellow, orange, or maroon ray flowers, including the black-eyed Susan