coreopsis
Concise Oxford English Dictionary © 2008 Oxford University Press:
coreopsis /ˌkɒrɪˈɒpsɪs/
▶noun (pl. coreopses) a plant of the daisy family, cultivated for its rayed, typically yellow, flowers. [Genus Coreopsis.]
– origin mod. L., from Gk koris ‘bug’ + opsis ‘appearance’ (because of the shape of the seed).
'coreopsis' also found in these Oxford entries:

