Taxon Report

Arctostaphylos crustacea Eastw. ssp. subcordata (Eastw.) V.T. Parker, M.C. Vasey & J.E. Keeley

Santa Cruz Island manzanita

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Taxon Summary

Arctostaphylos crustacea ssp. subcordata, commonly known as Santa Cruz Island manzanita, is a perennial evergreen shrub in the Ericaceae that is found only in California. It occurs within Chaparral, and Closed-cone coniferous forest, growing at elevations from 100 to 730 meters. Arctostaphylos crustacea ssp. subcordata is ranked 4.2, Plants of Limited Distribution, A Watch List; Moderately threatened in California.

Classification


Scientific Name:	Arctostaphylos crustacea Eastw. ssp. subcordata (Eastw.) V.T. Parker, M.C. Vasey & J.E. Keeley
Common Name:	Santa Cruz Island manzanita
Family:	Ericaceae
Element Code:	PDERI041H7
USDA Plants Symbol:
Synonyms/Other Names:	Arctostaphylos tomentosa ssp. subcordata

Ecology and Life History


Lifeform:	perennial evergreen shrub
Blooming Period: Jan-Apr	Jan-Apr
Elevation:	100-730 (330-2395)
General Habitats:	Chaparral, Closed-cone coniferous forest
Microhabitat:	Rocky
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	4.2
Global Rank:	G4T3
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: True
California Counties and Islands: Name (Code)
Los Angeles (LAX), Santa Barbara (SBA)
Quads: Name (Quad Code)
Santa Catalina North (3311844), Santa Catalina West (3311845), Santa Cruz Island A (3311987), Santa Cruz Island B (3311986), Santa Cruz Island C (3311985), Santa Cruz Island D (3311984), Santa Rosa Island East (3311988), Santa Rosa Island North (3312081), Tranquillon Mtn. (3412055)

Threat List Data from the CNDDB


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

Notes



Does plant occur in SLO Co.? Possibly threatened by feral herbivores. See Leaflets of Western Botany 1:61 (1933) for original description, and Madroño 19(6):198 (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 9 May 2025].