Taxon Details

Eriogonum giganteum var. compactum

Santa Barbara Island buckwheat

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Taxon Summary:

Eriogonum giganteum var. compactum, commonly known as Santa Barbara Island buckwheat, is a perennial deciduous shrub in the Polygonaceae that is found only in California. It occurs within Coastal bluff scrub, growing at elevations from 10 to 300 meters. Eriogonum giganteum var. compactum is ranked 1B.3, Plants Rare, Threatened or Endangered in California and Elsewhere; Not very threatened in California.

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:
Name Status:	JEF, FNA, POWO, IPNI, Tropicos

Conservation Status

CA Rare Plant Rank:	1B.3
Fed List:	None
State List:	CR (1979-11-01)
Global Rank:	G3T2
State Rank:	S2
Other Status:	SB_CalBG/RSABG; SB_USDA
CRPR Changes:
Add Date:	1974-01-01
Date Edited:	2024-08-06

Ecology and Life History

Lifeform: perennial deciduous shrub

Blooming Period: May-Aug(Sep)

Elevation:
10 - 300 meters
35 - 985 feet

General Habitats:

Coastal bluff scrub (usually rocky)

Microhabitat Details:

Microhabitat:

Notes

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:

Threat List Data from the CNDDB

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

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					4
A	B	C	D	X	U
0	3	0	0	0	1

Occurrence Status:
Historical >20 Years	4
Recent <=20 Years	0

Presence:
Presumed Extant	4
Possibly Extirpated	0
Presumed Extirpated	0

Location

California Endemic:

California Island:

States: Name (Code)
California (CA)

California Counties and Islands: Name (Code)
Santa Barbara (SBA)

Quads: Name (Quad Code)
Santa Barbara Island (3311848)

Notes:

Definitions of codes following a county and/or quad:
*		Presumed extirpated
(?)		Occurrence confirmed, but possibly extirpated
Quad and county data is imported from the CNDDB. Species may be present in other areas where conditions are favorable. These data should NOT be substituted for pre-project review or for on-site surveys.

Regional Map

Map

Presumed Extant

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CNPS Rare Plant Inventory