Taxon Report

Horkelia yadonii B. Ertter

Santa Lucia horkelia

Print Report

Taxon Summary

Horkelia yadonii, commonly known as Santa Lucia horkelia, is a perennial rhizomatous herb in the Rosaceae that is found only in California. It occurs within Broadleafed upland forest, Chaparral, Cismontane woodland, Meadows and seeps, and Riparian woodland, growing at elevations from 300 to 1900 meters. Horkelia yadonii is ranked 4.2, Plants of Limited Distribution, A Watch List; Moderately threatened in California.

Classification


Scientific Name:	Horkelia yadonii B. Ertter
Common Name:	Santa Lucia horkelia
Family:	Rosaceae
Element Code:	PDROS0W0K0
USDA Plants Symbol:	HOYA2
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial rhizomatous herb
Blooming Period: Apr-Jul	Apr-Jul
Elevation:	300-1900 (985-6235)
General Habitats:	Broadleafed upland forest, Chaparral, Cismontane woodland, Meadows and seeps, Riparian woodland
Microhabitat:	Granitic, Sandy
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	4.2
Global Rank:	G3
State Rank:	S3
State List:	None
Fed List:	None
Other Status:	USFS_S
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)
Monterey (MNT), San Benito (SBT), San Luis Obispo (SLO), Santa Barbara (SBA)
Quads: Name (Quad Code)
Alder Peak (3512183), Big Pine Mtn. (3411966), Burnett Peak (3512172), Burro Mountain (3512173), Camatta Ranch (3512043), Chews Ridge (3612135), Cosio Knob (3612112), Cypress Mountain (3512058), Jolon (3512182), Junipero Serra Peak (3612124), La Panza (3512032), Pozo Summit (3512033), San Benito Mtn. (3612036), San Rafael Mtn. (3411967), Santa Margarita (3512045), Tassajara Hot Springs (3612125), Ventana Cones (3612136), Wilson Corner (3512044)

Threat List Data from the CNDDB


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

Notes



Possibly threatened by vehicles and recreational activities. Confused with H. cuneata ssp. sericea, H. rydbergii, and H. tenuiloba. See Systematic Botany 18(1):139 (1993) 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 8 February 2025].