Taxon Report

Arctostaphylos hispidula Howell

Howell's manzanita

Print Report

Taxon Summary

Arctostaphylos hispidula, commonly known as Howell's manzanita, is a perennial evergreen shrub in the Ericaceae that is found in California and elsewhere. It occurs within Chaparral (sandstone, and serpentinite), growing at elevations from 120 to 1250 meters. Arctostaphylos hispidula is ranked 4.2, Plants of Limited Distribution, A Watch List; Moderately threatened in California.

Classification


Scientific Name:	Arctostaphylos hispidula Howell
Common Name:	Howell's manzanita
Family:	Ericaceae
Element Code:	PDERI04230
USDA Plants Symbol:	ARHI5
Synonyms/Other Names:	Arctostaphylos stanfordiana Parry ssp. hispidula (Howell) Adams

Ecology and Life History


Lifeform:	perennial evergreen shrub
Blooming Period: Mar-Apr	Mar-Apr
Elevation:	120-1250 (395-4100)
General Habitats:	Chaparral
Microhabitat:
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	4.2
Global Rank:	G4
State Rank:	S3
State List:	None
Fed List:	None
Other Status:	SB_UCSC
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: False
California Counties and Islands: Name (Code)
Del Norte (DNT), Humboldt (HUM), Siskiyou (SIS), Sonoma (SON)
Quads: Name (Quad Code)
Big Foot Mtn. (3812372), Black Lassic (4012335), Camp Meeker (3812248), Cant Hook Mtn. (4112368), Childs Hill (4112461), Devils Punchbowl (4112376), Dinsmore (4012345), Gasquet (4112378), Guerneville (3812258), High Divide (4112481), High Plateau Mtn. (4112388), Hiouchi (4112471), Klamath Glen (4112358), Ship Mountain (4112367)

Threat List Data from the CNDDB


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

Notes



Threatened by mining. Possibly threatened by vehicles. Endangered in OR. See A Flora of Northwest America, p. 415 (1903) by T.J. Howell 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 14 March 2025].