Taxon Report

Eriogonum congdonii (S. Stokes) Rev.

Congdon's buckwheat

Print Report

Steve Matson 2014

Taxon Summary

Eriogonum congdonii, commonly known as Congdon's buckwheat, is a perennial deciduous shrub in the Polygonaceae that is found only in California. It occurs within Lower montane coniferous forest, growing at elevations from 800 to 2345 meters. Eriogonum congdonii is ranked 4.3, Plants of Limited Distribution, A Watch List; Not very threatened in California.

Classification


Scientific Name:	Eriogonum congdonii (S. Stokes) Rev.
Common Name:	Congdon's buckwheat
Family:	Polygonaceae
Element Code:	PDPGN081A0
USDA Plants Symbol:	ERCO19
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial deciduous shrub
Blooming Period: (May)Jun-Aug(Sep)	(May)Jun-Aug(Sep)
Elevation:	800-2345 (2625-7695)
General Habitats:	Lower montane coniferous forest
Microhabitat:	Openings, Rocky, Serpentine
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	4.3
Global Rank:	G4
State Rank:	S4
State List:	None
Fed List:	None
Other Status:
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)
Shasta (SHA), Siskiyou (SIS), Trinity (TRI)
Quads: Name (Quad Code)
Billys Peak (4112227), Bully Choop Mtn. (4012257), Caribou Lake (4112218), Carrville (4112216), Chicken Hawk Hill (4112214), China Mtn. (4112245), Covington Mill (4012287), Damnation Peak (4012285), Deadman Point (4112384), Grizzly Peak (4112128), Hanland Peak (4012283), Ironside Mtn. (4012374), Lamoine (4012284), Lewiston (4012267), Mount Eddy (4112234), Mumbo Basin (4112225), Schell Mtn. (4012275), Scott Mountain (4112236), Seven Lakes Basin (4112224), Shoeinhorse Mtn. (4112211), Siligo Peak (4012288), South China Mtn. (4112235), Tangle Blue Lake (4112226), Thurston Peaks (4012382), Tombstone Mtn. (4112213), Whiskeytown (4012265), Whisky Bill Peak (4112215), Ycatapom Peak (4112217)

Threat List Data from the CNDDB


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

Notes



Possibly threatened by logging. See Aliso 7(2):220 (1970) for original description, and Phytologia 66(4):349 (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 1 March 2025].