(noun) any of various plants of the genus Rudbeckia cultivated for their large usually yellow daisies with prominent central cones.
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Noun Definition 1
(noun) a wildflower of the genus Ratibida.
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Noun Definition 2
(noun) any of various perennials of the eastern United States having thick rough leaves and long-stalked showy flowers with drooping rays and a conelike center.