The Nature Conservancy maintains the Camassia Natural Area in central West Linn as one of its conservancy preserves. The -area is located on a rocky plateau exposed by the Bretz Floods and now named after the camas which bloom there in spring; it hosts about 300 other species, including the white rock larkspur, a species located in only a half dozen other places in the world. It supports Oregon white oak-madrone woodlands, a stand of quaking aspen, wet meadows, ponds, and vernal pools.