Taxon Details

Eriogonum grande var. rubescens

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

Conservation Status

CA Rare Plant Rank:	1B.2
Fed List:	None
State List:	None
Global Rank:	G4T3
State Rank:	S3
Other Status:
CRPR Changes:
Add Date:	1980-01-01
Date Edited:	2021-05-26

Ecology and Life History

Lifeform: perennial herb

Blooming Period: Apr-Oct

Elevation:
10 - 245 meters
35 - 805 feet

General Habitats:

Coastal bluff scrub
Chaparral
Coastal scrub

Microhabitat Details:

Microhabitat:

Notes

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:

Threat List Data from the CNDDB

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

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					31
A	B	C	D	X	U
0	4	1	0	0	26

Occurrence Status:
Historical >20 Years	31
Recent <=20 Years	0

Presence:
Presumed Extant	31
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)
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)

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