Taxon Details

Arctostaphylos hookeri ssp. hearstiorum

Hearsts' manzanita

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Photo of Arctostaphylos hookeri ssp. hearstiorum

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
Name Status:	JEF, FNA, POWO, IPNI, Tropicos

Conservation Status

CA Rare Plant Rank:	1B.2
Fed List:	None
State List:	CE (1979-09-01)
Global Rank:	G3T2
State Rank:	S2?
Other Status:
CRPR Changes:
Add Date:	1974-01-01
Date Edited:	2024-05-09

Ecology and Life History

Lifeform: perennial evergreen shrub

Blooming Period: Feb-Apr

Elevation:
55 - 200 meters
180 - 655 feet

General Habitats:

Chaparral (maritime)
Coastal prairie
Coastal scrub
Valley and foothill grassland

Microhabitat Details:

Microhabitat:

Sandy

Notes

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:

Threat List Data from the CNDDB

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

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					5
A	B	C	D	X	U
0	1	0	0	0	4

Occurrence Status:
Historical >20 Years	4
Recent <=20 Years	1

Presence:
Presumed Extant	5
Possibly Extirpated	0
Presumed Extirpated	0

Location

California Endemic:

California Island:

States: Name (Code)
California (CA)

California Counties and Islands: Name (Code)
San Luis Obispo (SLO)

Quads: Name (Quad Code)
Piedras Blancas (3512163), San Simeon (3512162)

Notes:

Definitions of codes following a county and/or quad:
*		Presumed extirpated
(?)		Occurrence confirmed, but possibly extirpated
Quad and county data is imported from the CNDDB. Species may be present in other areas where conditions are favorable. These data should NOT be substituted for pre-project review or for on-site surveys.

Regional Map

Map

Presumed Extant

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CNPS Rare Plant Inventory