The Collaborative International Dictionary of English v.0.48:

Lyonia \Lyonia\ prop. n.
   A genus of evergreen or deciduous shrubs or small trees of
   the U. S. to the Antilles and eastern Asia to Himalaya.

   Syn: genus Lyonia.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Lyonia
    n 1: evergreen or deciduous shrubs or small trees of United
         States to Antilles and eastern Asia to the Himalaya [syn:
         Lyonia, genus Lyonia]