The Collaborative International Dictionary
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).
Shallon \Shal"lon\, n. (Bot.) An evergreen shrub ( Gaultheria Shallon) of Northwest America; also, its fruit. See Salal-berry.
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.
Wikipedia
Gaultheria shallon is a leathery-leaved shrub in the heather family ( Ericaceae), native to western North America. In English, it is known as salal, shallon, or simply gaultheria in Britain.