The larvae feed on "Yucca brevifolia". The valley below the peak is dense with Joshua trees ("Yucca brevifolia"). Joshua trees ("Yucca brevifolia") are protected by law in some states. The park is named for the Joshua trees ("Yucca brevifolia") native to the Mojave Desert. Yucca brevifolia is a plant species belonging to the genus "Yucca". The plant is nicknamed for its glaucous leaves that grow in clusters, resembling "Yucca brevifolia". The Thornpalm's closest correlation resembles a "Yucca brevifolia" also known as a Joshua Tree. Joshua tree ("Yucca brevifolia"), and Coastal sage scrub oak ("Quercus dumosa") woodland.