Copse - a thicket of small trees or shrubs
Thicket - a dense growth of shrubs or undergrowth
Grove - A small growth of trees without underbrush
Forest - A dense growth of trees, plants and underbrush covering a large area
Pale - An area enclosed by a fence or boundary.
As in... "Within the pale, we began to see the beginnings of a copse, a thicket of plants looking much like a grove
