The Collaborative International Dictionary of English v.0.48:

Fortunella \Fortunella\ prop. n.
   small genus of shrubs called kumquats, native to South China,
   producing small ovoid orangelike fruits called kumquats.

   Syn: genus Fortunella.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Fortunella
    n 1: small genus of shrubs native to south China producing small
         ovoid fruits resembling oranges: includes kumquats [syn:
         Fortunella, genus Fortunella]