Threatened by development, road construction, road maintenance, vehicles, vegetation clearing, and non-native plants. Plants from the coastal sector of the San Luis Range and Arroyo Grande drainage in SLO Co. were previously treated as A. wellsii. See Erythea 8:101 (1938) for original description.
California Counties and Islands:name (code) Monterey (MNT), San Luis Obispo (SLO)
Quads:name (DWR code) USGS code Tar Spring Ridge (220B) 35120B4, Pismo Beach (221B) 35120B6, Port San Luis (222A) 35120B7, Santa Margarita Lake (245C) 35120C4, Pozo Summit (245D) 35120C3, Atascadero (246B) 35120D6, Cypress Mountain (270C) 35120E8
Definitions of codes preceding a county and/or quad:
Uncertain about distribution or identity
Uncertain about distribution, but presumed extirpated if once present
Occurrence confirmed, but possibly extirpated
Species may be present in other areas where conditions are favorable.