Threatened by grazing, trampling, and recreation. Possibly threatened by non-native plants and vehicles. See T. macrophylla var. semota in The Jepson Manual (1993); USFWS uses this name. See Fl. Calif. 2: 245 (1936) for original description and Annals of the Missouri Botanical Garden 81(4): 719 (1994) for revised nomenclature.