Wordnet 3.0
NOUN (3)
1.
any of various plants of the genus Rudbeckia cultivated for their large usually yellow daisies with prominent central cones;
2.
a wildflower of the genus Ratibida;
3.
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;
The Collaborative International Dictionary of English v.0.48:
Coneflower \Cone"flow`er\, n.
1. Any plant of the genus Rudbeckia; -- so called from the
cone-shaped disk of the flower head. They are cultivated
for their large usually yellow daisies with prominent
central cones. Also, any plant of the related genera
Ratibida and Brauneria, the latter usually known as
purple coneflower.
[Webster 1913 Suppl.]
2. any of various perennials of eastern US having thick rough
leaves and long-stalked showy flowers with drooping rays
and a conelike center.
[WordNet 1.5]
WordNet (r) 3.0 (2006):
coneflower
n 1: any of various plants of the genus Rudbeckia cultivated for
their large usually yellow daisies with prominent central
cones
2: a wildflower of the genus Ratibida
3: 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