Wordnet 3.0
NOUN (1)
1. 
 coneflower with flower heads resembling a Mexican hat with a tall red-brown disk and drooping yellow or yellow and red-brown rays; 
 grows in the great plains along base of Rocky Mountains; 
[syn: Mexican hat, Ratibida columnaris]
WordNet (r) 3.0 (2006):
Ratibida columnaris
    n 1: coneflower with flower heads resembling a Mexican hat with
         a tall red-brown disk and drooping yellow or yellow and
         red-brown rays; grows in the great plains along base of
         Rocky Mountains [syn: Mexican hat, Ratibida columnaris]