Taxon Report

Horkelia congesta Hook. var. nemorosa (D.D. Keck) M. Peck

Josephine horkelia

Print Report

Taxon Summary

Horkelia congesta var. nemorosa, commonly known as Josephine horkelia, is a perennial herb in the Rosaceae that is found in California and elsewhere. It occurs within North Coast coniferous forest (clay, and serpentine seeps), growing at elevations from 300 to 800 meters. Horkelia congesta var. nemorosa is ranked 2B.1, Plants Rare, Threatened, or Endangered in California, But More Common Elsewhere; Seriously threatened in California.

Classification


Scientific Name:	Horkelia congesta Hook. var. nemorosa (D.D. Keck) M. Peck
Common Name:	Josephine horkelia
Family:	Rosaceae
Element Code:	PDROS0W032
USDA Plants Symbol:
Synonyms/Other Names:	Horkelia congesta Hook ssp. nemorosa Keck

Ecology and Life History


Lifeform:	perennial herb
Blooming Period: May-Jul	May-Jul
Elevation:	300-800 (985-2625)
General Habitats:	North Coast coniferous forest
Microhabitat:
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	2B.1
Global Rank:	G4T4?
State Rank:	S1
State List:	None
Fed List:	None
Other Status:
CRPR Changes:	changed from 2.1 to 2B.1 on 2013-06-12

Occurrence Data from the CNDDB


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

Location


California Endemic: False
California Counties and Islands: Name (Code)
Del Norte (DNT)
Quads: Name (Quad Code)
Shelly Creek Ridge (4112387)

Threat List Data from the CNDDB


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

Notes



Known in CA only from Shelly Creek.
Threats:

Taxonomy:

Selected References

Horkelia congesta var. nemorosa profile for potential Species of Conservation Concern evaluation (2018)

Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 19 November 2025].