Approximately one third of the historical occurrences in CA have been extirpated; threatened by urbanization, road construction, vehicles, grazing, trampling, erosion, and non-native plants. Several occurrences introduced (22B, 34C, 35B, 36D), but few have survived. See Proceedings of the American Academy of Arts and Sciences 8:368 (1872) for original description.
California Counties and Islands:name (code) San Diego (SDG)
Quads:name (DWR code) USGS code Dulzura (010A) 32116F7, Jamul Mountains (010B) 32116F8, Otay Mesa (010C) 32116E8, National City (011A)* 32117F1, Point Loma (011B)* 32117F2, Imperial Beach (011D) 32117E1, Viejas Mountain (020C) 32116G6, El Cajon Mtn. (021A) 32116H7, San Vicente Reservoir (021B) 32116H8, El Cajon (021C) 32116G8, Alpine (021D) 32116G7, Poway (022A) 32117H1, Del Mar (022B) 32117H2, La Jolla (022C)* 32117G2, La Mesa (022D) 32117G1, San Pasqual (034C) 33116A8, Ramona (034D) 33116A7, San Marcos (035B) 33117B2, Rancho Santa Fe (035C) 33117A2, Escondido (035D) 33117A1, San Luis Rey (036A) 33117B3, Encinitas (036D) 33117A3
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.