The foothills of the range are in creosote scrub and Joshua tree forests, which adjoin the dense Joshua tree woodlands atop . Higher up, pinyon pine and juniper grow on the sky island which occasional rains create above 6,000 feet (1,800 m). The north side of the crest contains a small forest of white fir trees, which is extremely difficult to reach. Clark Mountain is one of three mountain areas where these rare trees persist; Kingston and New York Mountains are the other two areas where the Rocky Mountain white fir - Abies concolor can be found in California.