The Collaborative International Dictionary of English v.0.48:

Calliopsis \Cal`li*op"sis\, n. [NL., fr. Gr. pref. kalli- (fr.
   kalo`s beautiful) + 'o`psis appearance.] (Bot.)
   A popular name given to a few species of the genus
   Coreopsis, especially to Coreopsis tinctoria of Arkansas.
   [1913 Webster]

WordNet (r) 3.0 (2006):

calliopsis
    n 1: North American annual widely cultivated for its yellow
         flowers with purple-red to brownish centers; in some
         classifications placed in a subgenus Calliopsis [syn:
         calliopsis, Coreopsis tinctoria]