Taxon Report

Horkelia wilderae Parish

Barton Flats horkelia

Print Report

Taxon Summary

Horkelia wilderae, commonly known as Barton Flats horkelia, is a perennial herb in the Rosaceae that is found only in California. It occurs within Chaparral (edges), Lower montane coniferous forest, and Upper montane coniferous forest, growing at elevations from 1675 to 2925 meters. Horkelia wilderae is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.

Classification


Scientific Name:	Horkelia wilderae Parish
Common Name:	Barton Flats horkelia
Family:	Rosaceae
Element Code:	PDROS0W0J0
USDA Plants Symbol:	HOWI
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial herb
Blooming Period: May-Sep	May-Sep
Elevation:	1675-2925 (5495-9595)
General Habitats:	Chaparral, Lower montane coniferous forest, Upper montane coniferous forest
Microhabitat:
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.1
Global Rank:	G1
State Rank:	S1
State List:	None
Fed List:	None
Other Status:	SB_CalBG/RSABG; USFS_S
CRPR Changes:

Occurrence Data from the CNDDB


Total Occurrences:	8
Element Occurrence Ranks:
Excellent (A)	2
Good (B)	1
Fair (C)	2
Poor (D)	0
None (X)	0
Unknown (U)	3

Location


California Endemic: True
California Counties and Islands: Name (Code)
San Bernardino (SBD)
Quads: Name (Quad Code)
Big Bear Lake (3411628), Moonridge (3411627)

Threat List Data from the CNDDB


Threat List Total:	4
EOs with Threat Listed:	Total EOs	% of EOs
	2	25 %
Foot traffic/trampling	2	25%
Recreational use (non-ORV)	1	12%
Road/trail construction/maint.	1	12%
Development	1	12%

Notes



Known from fewer than ten occurrences in the Barton Flats area. Threatened by logging and recreational activities. Possibly threatened by vegetation/fuel management. See Botanical Gazette 38:460 (1904) for original description.
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 6 November 2025].