Taxon Report

Eriogonum umbellatum Torr. var. ahartii Reveal

Ahart's buckwheat

Print Report

Taxon Summary

Eriogonum umbellatum var. ahartii, commonly known as Ahart's buckwheat, is a perennial herb in the Polygonaceae that is found only in California. It occurs within Chaparral, and Cismontane woodland, growing at elevations from 400 to 2000 meters. Eriogonum umbellatum var. ahartii is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.

Classification


Scientific Name:	Eriogonum umbellatum Torr. var. ahartii Reveal
Common Name:	Ahart's buckwheat
Family:	Polygonaceae
Element Code:	PDPGN086UY
USDA Plants Symbol:
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial herb
Blooming Period: Jun-Sep	Jun-Sep
Elevation:	400-2000 (1310-6560)
General Habitats:	Chaparral, Cismontane woodland
Microhabitat:	Openings, Serpentine, Slopes
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.2
Global Rank:	G5T3
State Rank:	S3
State List:	None
Fed List:	None
Other Status:	BLM_S; SB_UCSC; USFS_S
CRPR Changes:	added to 1B.2 on 2010-11-29 added to 4.2? on 2007-09-17

Occurrence Data from the CNDDB


Total Occurrences:	32
Element Occurrence Ranks:
Excellent (A)	1
Good (B)	13
Fair (C)	3
Poor (D)	0
None (X)	0
Unknown (U)	15

Location


California Endemic: True
California Counties and Islands: Name (Code)
Butte (BUT), Plumas (PLU), Sierra (SIE), Yuba (YUB)
Quads: Name (Quad Code)
Berry Creek (3912164), Cascade (3912162), Challenge (3912142), Cherokee (3912165), Clipper Mills (3912152), Cohasset (3912186), Goodyears Bar (3912058), Meadow Valley (3912181), Paradise East (3912175), Paradise West (3912176), Pulga (3912174), Stirling City (3912185)

Threat List Data from the CNDDB


Threat List Total:	9
EOs with Threat Listed:	Total EOs	% of EOs
	15	47 %
Road/trail construction/maint.	8	25%
Logging	6	18%
ORV activity	4	12%
Other	4	12%
Wood cutting or brush clearing	4	12%
Erosion/runoff	2	6%
Recreational use (non-ORV)	2	6%
Mining	2	6%
Non-native plant impacts	2	6%

Notes



Threatened by road and trail construction and maintenance, vehicles, and fire suppression. Potentially threatened by logging. Not in The Jepson Manual (1993). See Phytologia 86:146 (2004) for original description.
Threats:

Taxonomy:

Selected References

CRPR List Addition on 2007-09-17

CRPR List Addition on 2010-11-29

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].