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'Gaultheria humifusa' from the website Trees and Shrubs Online (treesandshrubsonline.
This species is nearly akin to G. ovatifolia but is of neater, closer, more tufted habit and about 4 in. high. The leaves are about half the size and the calyx is glabrous. There is no constant difference in the size of the fruits. It is quite hardy and suitable for the rock garden. Native of western N. America.