Taxon Report

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

island manzanita

Print Report


© 2019 Zoya Akulova

Taxon Summary

Arctostaphylos crustacea ssp. insulicola, commonly known as 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 90 to 520 meters. Arctostaphylos crustacea ssp. insulicola is ranked 4.2, Plants of Limited Distribution, A Watch List; Moderately threatened in California.

  Classification
Scientific Name:
 Arctostaphylos crustacea Eastw. ssp. insulicola (P.V. Wells) V.T. Parker, M.C. Vasey & J.E. Keeley
Common Name:
 island manzanita
Family: Ericaceae
Element Code: PDERI041H5
USDA Plants Symbol:
Synonyms/Other Names:
  • Arctostaphylos tomentosa ssp. insulicola

Ecology and Life History
Lifeform: perennial evergreen shrub
Blooming Period: Jun-Mar Jun-Mar
Elevation: 90-520 (295-1705)
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:
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)
Santa Barbara (SBA)
Quads: Name (Quad Code)
Santa Cruz Island A (3311987), Santa Cruz Island B (3311986), Santa Cruz Island C (3311985), Santa Rosa Island North (3312081)

Threat List Data from the CNDDB

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

Notes
Possibly threatened by feral herbivores. See Madroño 19(6):198 (1968) 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 9 May 2025].