The Collaborative International Dictionary of English v.0.48:

Chelidonium \Chelidonium\ n.
   a genu having only one species; the greater celandine.

   Syn: genus Chelidonium.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Chelidonium
    n 1: one species: greater celandine [syn: Chelidonium, genus
         Chelidonium]