The Collaborative International Dictionary of English v.0.48:

Nuytsia \Nuytsia\ prop. n.
   A genus consisting of only one species.

   Syn: genus Nuytsia.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Nuytsia
    n 1: one species [syn: Nuytsia, genus Nuytsia]