Taxon Report

Eriogonum giganteum Wats. var. compactum Dunkle

Santa Barbara Island buckwheat

Print Report


  Classification
Scientific Name:
 Eriogonum giganteum Wats. var. compactum Dunkle
Common Name:
 Santa Barbara Island buckwheat
Family: Polygonaceae
Element Code: PDPGN082A1
USDA Plants Symbol: ERGIC
Synonyms/Other Names:

Ecology and Life History
Lifeform: perennial deciduous shrub
Blooming Period: May-Aug(Sep) May-Aug(Sep)
Elevation: 10-300 (35-985)
General Habitats: Coastal bluff scrub
Microhabitat:
Microhabitat Details:

Conservation Status
CA Rare Plant Rank: 1B.3
Global Rank: G3T2
State Rank:
 S2
State List: CR
Fed List: None
Other Status: SB_CalBG/RSABG; SB_USDA
CRPR Changes:

Occurrence Data from the CNDDB
Total Occurrences: 4
Element Occurrence Ranks:
   Excellent (A) 0
   Good (B) 3
   Fair (C) 0
   Poor (D) 0
   None (X) 0
   Unknown (U) 1

Location
California Endemic:  True
California Counties and Islands: Name (Code)
Santa Barbara (SBA)
Quads: Name (Quad Code)
Santa Barbara Island (3311848)

Threat List Data from the CNDDB

Threat List Total: 3
EOs with Threat Listed: Total EOs % of EOs
3 75 %
Erosion/runoff 2 50%
Foot traffic/trampling 1 25%
Other 1 25%

Notes
Known from fewer than 10 occurrences, but population numbers are increasing. Threatened by non-native plants. See Bulletin of the Southern California Academy of Sciences 41:130 (1943) for original description, and Phytologia 66(4):318-319 (1989) for taxonomic treatment.
Threats:
Taxonomy:

Selected References

Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 2 January 2025].