The Collaborative International Dictionary of English v.0.48:

Gaultheria \Gaul*the"ri*a\, n. [NL.] (Bot.)
   A genus of ericaceous shrubs with evergreen foliage, and,
   often, edible berries. It includes the American winter-green
   (Gaultheria procumbens), and the larger-fruited salal of
   Northwestern America (Gaultheria Shallon).
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Salal-berry \Sal"al-ber`ry\, n. [Probably of American Indian
   origin.] (Bot.)
   The edible fruit of the Gaultheria Shallon, an ericaceous
   shrub found from California northwards. The berries are about
   the size of a common grape and of a dark purple color.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Shallon \Shal"lon\, n. (Bot.)
   An evergreen shrub (Gaultheria Shallon) of Northwest
   America; also, its fruit. See Salal-berry.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Gaultheria shallon
    n 1: small evergreen shrub of Pacific coast of North America
         having edible dark purple grape-sized berries [syn:
         salal, shallon, Gaultheria shallon]