Taxon Report

Symphyotrichum defoliatum (Parish) Nesom

San Bernardino aster

Print Report


  Classification
Scientific Name:
 Symphyotrichum defoliatum (Parish) Nesom
Common Name:
 San Bernardino aster
Family: Asteraceae
Element Code: PDASTE80C0
USDA Plants Symbol: SYDE
Synonyms/Other Names:

Ecology and Life History
Lifeform: perennial rhizomatous herb
Blooming Period: Jul-Nov Jul-Nov
Elevation: 2-2040 (5-6695)
General Habitats: Cismontane woodland, Coastal scrub, Lower montane coniferous forest, Marshes and swamps, Meadows and seeps, Valley and foothill grassland
Microhabitat: Streambanks
Microhabitat Details: near ditches, streams, springs

Conservation Status
CA Rare Plant Rank: 1B.2
Global Rank: G2
State Rank:
 S2
State List: None
Fed List: None
Other Status: BLM_S; SB_CalBG/RSABG; SB_CRES; USFS_S
CRPR Changes:
  • added to 1B on 2004-08-20

Occurrence Data from the CNDDB
Total Occurrences: 102
Element Occurrence Ranks:
   Excellent (A) 1
   Good (B) 6
   Fair (C) 1
   Poor (D) 1
   None (X) 16
   Unknown (U) 77

Location
California Endemic:  True
California Counties and Islands: Name (Code)
Imperial (IMP), Kern (KRN), Los Angeles (LAX), Orange (ORA), Riverside (RIV), San Bernardino (SBD), San Diego (SDG), San Luis Obispo (SLO)?, Santa Barbara (SBA)
Quads: Name (Quad Code)
Alberhill (3311764), Anaheim (3311778), Baldwin Park (3411718), Beauty Mountain (3311646), Big Bear City (3411637), Big Bear Lake (3411628), Boucher Hill (3311638), Cabazon (3311687), Cajon (3411734), Crystal Lake (3411737), Cuddy Valley (3411971), Cuyamaca Peak (3211685), Descanso (3211675), El Casco (3311781), Fontana (3411714), Frazier Mtn. (3411878), Guasti (3411715), Harrison Mtn. (3411722), Hollywood (3411813), Idyllwild (3311666), In-ko-pah Gorge (3211661), Julian (3311615), La Habra (3311788), Lake Fulmor (3311677), Lake Mathews (3311774), Lebec (3411877), Live Oak Springs (3211663), Long Beach (3311872), Los Alamitos (3311871)*, Monument Peak (3211684), Morena Reservoir (3211665), Mount Laguna (3211674), Mount San Antonio (3411736), Murrieta (3311752)*, Newport Beach (3311768)*, Oceano (3512015)?, Ontario (3411716)*, Orcutt (3412074), Palomar Observatory (3311637), Prado Dam (3311786)*, San Bernardino North (3411723), San Bernardino South (3411713), San Dimas (3411717), San Jacinto Peak (3311676), Santa Ysabel (3311616), Seal Beach (3311861)*, Sunnymead (3311782), Telegraph Peak (3411735), Torrance (3311873), Tustin (3311767)*, Victorville (3411753), Warner Springs (3311636), Warners Ranch (3311626), Whittier (3311881), Wildomar (3311753)

Threat List Data from the CNDDB

Threat List Total: 11
EOs with Threat Listed: Total EOs % of EOs
28 27 %
Development 16 15%
Non-native plant impacts 6 5%
Road/trail construction/maint. 4 3%
Foot traffic/trampling 3 2%
Grazing 2 1%
Other 2 1%
Agriculture 1 0%
ORV activity 1 0%
Mining 1 0%
Erosion/runoff 1 0%
Wood cutting or brush clearing 1 0%

Notes
Possibly threatened by non-native plants. Possible hybrids have been collected in VEN, SBA and SLO cos. Identification of specimen from OBI Co. (221D) needs verification. A synonym of Aster bernardinus in TJM (1993). See Phytologia 77(3):279 (1994) for revised nomenclature.
Threats:
Taxonomy:

Selected References

CRPR List Addition on 2004-08-20
Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 5 January 2025].