The Collaborative International Dictionary of English v.0.48:

Coptis \Coptis\ n.
   small genus of low perennial herbs having yellow rhizomes and
   white or yellow flowers.

   Syn: genus Coptis.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Coptis
    n 1: small genus of low perennial herbs having yellow rhizomes
         and white or yellow flowers [syn: Coptis, genus Coptis]