Calocedrus decurrens
A 2002 report estimated nearly of old growth in the Forest. The old growth includes coast Douglas fir ("Pseudotsuga menziesii var. menziesii"), Ponderosa pine ("Pinus ponderosa"), white fir ("Abies concolor"), sugar pine ("Pinus lambertiana"), California incense cedar ("Calocedrus decurrens"), California black oak ("Quercus kelloggii"), lodgepole pine ("Pinus contorta") and red fir ("Abies magnifica"). A number of species of invasive weeds have been recorded in the Forest, including thistles, knapweeds, mustards, toadflaxes, daisies, brooms, and aquatic.