The Collaborative International Dictionary of English v.0.48:

Myrica \My*ri"ca\, prop. n. [L., fr. Gr. ? tamarisk.] (Bot.)
   A widely dispersed genus of shrubs and trees, usually with
   aromatic foliage. It includes the bayberry or wax myrtle, the
   sweet gale, and the North American sweet fern, so called.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Myrica
    n 1: deciduous aromatic shrubs or small trees [syn: Myrica,
         genus Myrica]