Taxon Report

Eriogonum umbellatum Torr. var. glaberrimum (Gand.) Rev.

Warner Mountains buckwheat

Print Report

Taxon Summary

Eriogonum umbellatum var. glaberrimum, commonly known as Warner Mountains buckwheat, is a perennial herb in the Polygonaceae that is found in California and elsewhere. It occurs within Great Basin scrub, Lower montane coniferous forest, and Upper montane coniferous forest, growing at elevations from 1525 to 2405 meters. Eriogonum umbellatum var. glaberrimum is ranked 1B.3, Plants Rare, Threatened or Endangered in California and Elsewhere; Not very threatened in California.

Classification


Scientific Name:	Eriogonum umbellatum Torr. var. glaberrimum (Gand.) Rev.
Common Name:	Warner Mountains buckwheat
Family:	Polygonaceae
Element Code:	PDPGN086U2
USDA Plants Symbol:	ERUMG
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial herb
Blooming Period: Jun-Sep	Jun-Sep
Elevation:	1525-2405 (5005-7890)
General Habitats:	Great Basin scrub, Lower montane coniferous forest, Upper montane coniferous forest
Microhabitat:	Gravelly (sometimes), Sandy (sometimes)
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.3
Global Rank:	G5T2?
State Rank:	S2
State List:	None
Fed List:	None
Other Status:	BLM_S; SB_UCSC; USFS_S
CRPR Changes:

Occurrence Data from the CNDDB


Total Occurrences:	8
Element Occurrence Ranks:
Excellent (A)	0
Good (B)	5
Fair (C)	1
Poor (D)	0
None (X)	0
Unknown (U)	2

Location


California Endemic: False
California Counties and Islands: Name (Code)
Modoc (MOD), Siskiyou (SIS)
Quads: Name (Quad Code)
Beaver Mtn. (4112086), Boulder Peak (4112351), Cedarville (4112052), Davis Creek (4112063), Mt. Bidwell (4112082)

Threat List Data from the CNDDB


Threat List Total:	7
EOs with Threat Listed:	Total EOs	% of EOs
	5	63 %
Grazing	3	37%
Logging	3	37%
Road/trail construction/maint.	2	25%
Erosion/runoff	1	12%
Foot traffic/trampling	1	12%
ORV activity	1	12%
Recreational use (non-ORV)	1	12%

Notes



Threatened by grazing and vehicles. Previously included as E. umbellatum var. aureum; a taxon that does not occur in CA. See Taxon 17:531-532 (1968) for revised nomenclature, and Phytologia 66(4):341-347 (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 27 January 2025].