The Collaborative International Dictionary of English v.0.48:

Coreopsis \Co`re*op"sis\ (k[=o]`r[-e]*[o^]p"s[i^]s), prop. n.
   [NL., fr. Gr. ko`ris bug + 'o`psis appearance.] (Bot.)
   A genus of herbaceous composite plants, having the achenes
   two-horned and remotely resembling some insect; tickseed.
   Coreopsis tinctoria, of the Western plains, the commonest
   plant of the genus, has been used in dyeing.
   [1913 Webster]

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):

Coreopsis tinctoria
    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]