Taxon Report

Eriogonum grande Greene var. rubescens (Greene) Munz

red-flowered buckwheat

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Taxon Summary

Eriogonum grande var. rubescens, commonly known as red-flowered buckwheat, is a perennial herb in the Polygonaceae that is found only in California. It occurs within Chaparral, Coastal bluff scrub, and Coastal scrub, growing at elevations from 10 to 245 meters. Eriogonum grande var. rubescens is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.

Classification


Scientific Name:	Eriogonum grande Greene var. rubescens (Greene) Munz
Common Name:	red-flowered buckwheat
Family:	Polygonaceae
Element Code:	PDPGN082J2
USDA Plants Symbol:	ERGRR
Synonyms/Other Names:	Eriogonum grande Greene var. dunklei Reveal

Ecology and Life History


Lifeform:	perennial herb
Blooming Period: Apr-Oct	Apr-Oct
Elevation:	10-245 (35-805)
General Habitats:	Chaparral, Coastal bluff scrub, Coastal scrub
Microhabitat:
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.2
Global Rank:	G4T3
State Rank:	S3
State List:	None
Fed List:	None
Other Status:
CRPR Changes:

Occurrence Data from the CNDDB


Total Occurrences:	31
Element Occurrence Ranks:
Excellent (A)	0
Good (B)	4
Fair (C)	1
Poor (D)	0
None (X)	0
Unknown (U)	26

Location


California Endemic: True
California Counties and Islands: Name (Code)
Santa Barbara (SBA)
Quads: Name (Quad Code)
San Miguel Island East (3312083), San Miguel Island West (3312084), Santa Cruz Island A (3311987), Santa Rosa Island East (3311988), Santa Rosa Island North (3312081), Santa Rosa Island South (3312071), Santa Rosa Island West (3312082)

Threat List Data from the CNDDB


Threat List Total:	1
EOs with Threat Listed:	Total EOs	% of EOs
	4	13 %
Erosion/runoff	4	12%

Notes



Threatened by feral herbivores, and by cattle grazing on SRO Isl. Includes E. grande var. dunklei. See Pittonia 1:39 (1887) 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 5 November 2025].