Lemmingsworth Gulch Research Natural Area Siskiyou National Forest , USFS Klamath Mountains Ecoregion Cell(s): Port Orford cedar/hairy honeysuckle/fescue on ultramafic soils Douglas fir serpentine woodland Tanoak on ultramafics with shrub understory Tanoak - Douglas fir dry site forest with canyon live oak, dwarf Oregon grape and poison oak if possible Western white pine/beargrass Western white pine/huckleberry oak/beargrass with tanoak and Jeffrey pine if possible Knobcone pine forest Darlingtonia fen on serpentine-peridotite, with western azalea and camas along margins

Access by road and trail

Lemmingsworth Gulch RNA is a 495 ha tract located 1.7 miles north of the Oregon-California Border in Curry County, Oregon. The RNA encompasses an entire watershed that drains eastward into the North Fork of the Smith River, and its elevations range from 336 m. to 828m. The topography of the area consists of dissected drainages, steep slopes and narrow ridges. There is a dramatic contrast in vegetation due to a sharp contact between geologic substrates. The variety of geologic substrates, the elevation range, and the topographic diversity come together to produce a highly diverse flora. Peridotite substrates are forested with a mixture of nearly pure knobcone pine (Pinus attenuata) stands, Jeffrey pine (Pinus jeffreyi) woodlands, Douglas fir (Pseudotsuga menziesii), and mixed forests dominated by Douglas fir and evergreen hardwoods. In areas where tree cover drops to almost zero, shrub lands dominate. Normal substrates (Dothan Formation) are more densely forested with older Douglas fir stands and younger stands of tanoak (Lithocarpus) and Pacific madrone (Arbutus menziesii). Most of the stands on Dothan are generally healthy, though there is a high percentage of Port Orford cedar (Chamaecyparis lawsoniana) in a small area along the North Fork of the Smith River that is infected with Port Orford cedar root rot. Lemmingsworth Gulch RNA is most noteworthy for its extremely high concentration of endemic and rare plant species.