Taxon Report

Eriogonum grande Greene var. timorum Rev.

San Nicolas Island buckwheat

Print Report

Taxon Summary

Eriogonum grande var. timorum, commonly known as San Nicolas Island buckwheat, is a perennial herb in the Polygonaceae that is found only in California. It occurs within Coastal bluff scrub, growing at elevations from 10 to 215 meters. Eriogonum grande var. timorum is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.

Classification


Scientific Name:	Eriogonum grande Greene var. timorum Rev.
Common Name:	San Nicolas Island buckwheat
Family:	Polygonaceae
Element Code:	PDPGN082J3
USDA Plants Symbol:	ERGRT
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial herb
Blooming Period: Mar-Oct	Mar-Oct
Elevation:	10-215 (35-705)
General Habitats:	Coastal bluff scrub
Microhabitat:
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.1
Global Rank:	G4T1
State Rank:	S1
State List:	CE
Fed List:	None
Other Status:
CRPR Changes:

Occurrence Data from the CNDDB


Total Occurrences:	3
Element Occurrence Ranks:
Excellent (A)	1
Good (B)	0
Fair (C)	0
Poor (D)	0
None (X)	0
Unknown (U)	2

Location


California Endemic: True
California Counties and Islands: Name (Code)
Ventura (VEN)
Quads: Name (Quad Code)
San Nicolas Island (3311924)

Threat List Data from the CNDDB


Threat List Total:	0
EOs with Threat Listed:	Total EOs	% of EOs
	0	%

Notes



Possibly threatened by Navy activities, erosion, non-native plants, and hybridization with introduced Eriogonum spp. See Aliso 7(2):229 (1970) for original description, and Phytologia 66(4):333-334 (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 16 October 2025].