Taxon Report

Eriogonum umbellatum Torr. var. minus Jtn.

alpine sulfur-flowered buckwheat

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Taxon Summary

Eriogonum umbellatum var. minus, commonly known as alpine sulfur-flowered buckwheat, is a perennial herb in the Polygonaceae that is found only in California. It occurs within Subalpine coniferous forest, and Upper montane coniferous forest, growing at elevations from 1800 to 3068 meters. Eriogonum umbellatum var. minus is ranked 4.3, Plants of Limited Distribution, A Watch List; Not very threatened in California.

Classification


Scientific Name:	Eriogonum umbellatum Torr. var. minus Jtn.
Common Name:	alpine sulfur-flowered buckwheat
Family:	Polygonaceae
Element Code:	PDPGN086U7
USDA Plants Symbol:	ERUMM2
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial herb
Blooming Period: Jun-Sep	Jun-Sep
Elevation:	1800-3068 (5905-10065)
General Habitats:	Subalpine coniferous forest, Upper montane coniferous forest
Microhabitat:	Gravelly
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	4.3
Global Rank:	G5T4
State Rank:	S4
State List:	None
Fed List:	None
Other Status:	SB_CalBG/RSABG
CRPR Changes:

Occurrence Data from the CNDDB


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

Location


California Endemic: True
California Counties and Islands: Name (Code)
Los Angeles (LAX), San Bernardino (SBD)
Quads: Name (Quad Code)
Cajon (3411734), Crystal Lake (3411737), Cucamonga Peak (3411725), Fawnskin (3411638), Juniper Hills (3411748), Mount San Antonio (3411736), Pacifico Mountain (3411841), San Gorgonio Mtn. (3411617), Telegraph Peak (3411735), Valyermo (3411747), Waterman Mtn. (3411738)

Threat List Data from the CNDDB


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

Notes



See Bulletin of the California Academy of Sciences 17:64 (1918) for original description, and Phytologia 66(4):341-344 (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 3 July 2025].