The Collaborative International Dictionary of English v.0.48:

Epigaea \Ep`i*g[ae]"a\, n. [NL., fr. Gr. 'epi` upon + ? earth.]
   (Bot.)
   An American genus of plants, containing but a single species
   (E. repens), the trailing arbutus.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Epigaea
    n 1: small creeping evergreen shrubs: trailing arbutus [syn:
         Epigaea, genus Epigaea]