The Collaborative International Dictionary of English v.0.48:

Carduelis \Carduelis\ n.
   the type genus of a subfamily Carduelinae of the
   Fringillidae, used in some classifications. It includes the
   goldfinches (such as the American goldfinch, Cardulis
   tristis, and the European goldfinch, Carduelis carduelis);
   siskins; redpolls; and linnets, as well as the common
   northern cardinal (Carduelis cardinalis, also called the
   cardinal bird).

   Syn: genus Carduelis.
        [WordNet 1.5 +PJC]

WordNet (r) 3.0 (2006):

Carduelis
    n 1: in some classifications considered the type genus of a
         subfamily Carduelinae of the family Fringillidae:
         goldfinches; siskins; redpolls; linnets [syn: Carduelis,
         genus Carduelis]