any of a number of composite plants having daisylike flowers with a dark center disk and usually yellow ray flowers, especially Rudbeckia hirta: the state flower of Maryland.
Origin of black-eyed Susan
An Americanism dating back to 1890–95
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for black-eyed susan
any of several North American plants of the genus Rudbeckia, esp R. hirta, having flower heads of orange-yellow rays and brown-black centres: family Asteraceae (composites)
a climbing plant, Thunbergia alata, native to tropical Africa but widely naturalized elsewhere, having yellow flowers with purple centres, grown as a greenhouse annual
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012