Taxon Details

Eriogonum heermannii var. occidentale

western Heermann's buckwheat

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Taxon Summary:

Eriogonum heermannii var. occidentale, commonly known as western Heermann's buckwheat, is a perennial deciduous shrub in the Polygonaceae that is found only in California. It occurs within Cismontane woodland, growing at elevations from 105 to 795 meters. Eriogonum heermannii var. occidentale is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.

Classification

Scientific Name: Eriogonum heermannii Dur. & Hilg. var. occidentale S. Stokes
Common Name: western Heermann's buckwheat
Family:	Polygonaceae
Element Code:	PDPGN082P6
USDA Plants Symbol:	ERHEO
Synonyms/Other Names:
Name Status:	JEF, FNA, POWO, IPNI, Tropicos

Conservation Status

CA Rare Plant Rank:	1B.2
Fed List:	None
State List:	None
Global Rank:	G5T2
State Rank:	S2
Other Status:	BLM_S; SB_UCSC
CRPR Changes: changed from 4.2 to 1B.2 on 2015-06-15
Add Date:	1994-01-01
Date Edited:	2022-12-06

Ecology and Life History

Lifeform: perennial deciduous shrub

Blooming Period: Jul-Oct

Elevation:
105 - 795 meters
345 - 2610 feet

General Habitats:

Cismontane woodland (openings)

Microhabitat Details: usually alluvium floodplains

Microhabitat:

Clay (rarely)
Roadsides (usually)
Serpentine (often)
Shale (rarely)
Slopes (rarely)

Notes

Notes: Previously CRPR 4.2; rarer than originally thought. Possibly threatened by hydrological alterations caused by past vehicle use. See Leaflets of Western Botany 1(4):30 (1932) for original description, and Phytologia 66(4):314-316 (1989) for taxonomic treatment.
Threats:
Taxonomy:

Threat List Data from the CNDDB

THREAT LIST:
Threat List Total:	2
	Total EOs	% of EOs
EOs with Threat Listed:	1	8 %
Erosion/runoff	1	8%
ORV activity	1	8%

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					12
A	B	C	D	X	U
0	0	0	0	0	12

Occurrence Status:
Historical >20 Years	6
Recent <=20 Years	6

Presence:
Presumed Extant	12
Possibly Extirpated	0
Presumed Extirpated	0

Location

California Endemic:

California Island:

States: Name (Code)
California (CA)

California Counties and Islands: Name (Code)
Fresno (FRE), Monterey (MNT), San Benito (SBT)

Quads: Name (Quad Code)
Bickmore Canyon (3612152), Hepsedam Peak (3612037), Hernandez Reservoir (3612047), Idria (3612046), Lonoak (3612038), Panoche (3612057), Rock Spring Peak (3612048), Smith Mountain (3612015), Topo Valley (3612141), Tres Pinos (3612173)

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