Threatened by vehicles, road construction, hydrological alterations, recreational activities, foot traffic, non-native plants, and loss of salt marsh habitat. See Madroño 31(3):185-190 (1984) for information on parasitism.
California Counties and Islands:name (code) Los Angeles (LAX), Orange (ORA), Santa Barbara (SBA), San Bernardino (SBD), San Diego (SDG), San Luis Obispo (SLO), Ventura (VEN)
Quads:name (DWR code) USGS code National City (011A) 3211761, Point Loma (011B) 3211762, Imperial Beach (011D) 3211751, Del Mar (022B) 3211782, Aguanga (049A) 3311647, Newport Beach (071B) 3311768, Seal Beach (072A) 3311861, Long Beach (089C) 3311872, Los Alamitos (089D)* 3311871, San Bernardino South (107D) 3411713, Beverly Hills (111C)?* 3411814, Topanga (112D)* 3411815, Oxnard (114B) 3411922, Point Mugu (114D) 3411911, White Ledge Peak (141B) 3411944, Carpinteria (142A) 3411945, Morro Bay South (247D) 3512037
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.
This data should NOT be substituted for pre-project review or for on-site surveys.