Taxon Report

Arctostaphylos hookeri D. Don ssp. hearstiorum (Hoov. & Roof) Wells

Hearsts' manzanita

Print Report

Taxon Summary

Arctostaphylos hookeri ssp. hearstiorum, commonly known as Hearsts' manzanita, is a perennial evergreen shrub in the Ericaceae that is found only in California. It occurs within Chaparral (maritime), Coastal prairie, Coastal scrub, and Valley and foothill grassland, growing at elevations from 55 to 200 meters. Arctostaphylos hookeri ssp. hearstiorum is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.

Classification


Scientific Name:	Arctostaphylos hookeri D. Don ssp. hearstiorum (Hoov. & Roof) Wells
Common Name:	Hearsts' manzanita
Family:	Ericaceae
Element Code:	PDERI040J4
USDA Plants Symbol:	ARHOH
Synonyms/Other Names:	Arctostaphylos hearstiorum Hoov. & Roof

Ecology and Life History


Lifeform:	perennial evergreen shrub
Blooming Period: Feb-Apr	Feb-Apr
Elevation:	55-200 (180-655)
General Habitats:	Chaparral, Coastal prairie, Coastal scrub, Valley and foothill grassland
Microhabitat:	Sandy
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.2
Global Rank:	G3T2
State Rank:	S2?
State List:	CE
Fed List:	None
Other Status:
CRPR Changes:

Occurrence Data from the CNDDB


Total Occurrences:	5
Element Occurrence Ranks:
Excellent (A)	0
Good (B)	1
Fair (C)	0
Poor (D)	0
None (X)	0
Unknown (U)	4

Location


California Endemic: True
California Counties and Islands: Name (Code)
San Luis Obispo (SLO)
Quads: Name (Quad Code)
Piedras Blancas (3512163), San Simeon (3512162)

Threat List Data from the CNDDB


Threat List Total:	3
EOs with Threat Listed:	Total EOs	% of EOs
	4	80 %
Foot traffic/trampling	3	60%
Grazing	1	20%
Hybridization	1	20%

Notes



Known from five occurrences in the Arroyo de la Cruz area; need current status information. Threatened by grazing and rangeland conversion. See Four Seasons 2(1):2 (1966) for original description, and Madroño 19:200 (1968) for revised nomenclature.
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 5 February 2025].