Taxon Report

Arctostaphylos andersonii Gray

Anderson's manzanita

Print Report


© 2018 Jason Matthias Mills

Taxon Summary

Arctostaphylos andersonii, commonly known as Anderson's manzanita, is a perennial evergreen shrub in the Ericaceae that is found only in California. It occurs within Broadleafed upland forest, Chaparral, and North Coast coniferous forest, growing at elevations from 60 to 760 meters. Arctostaphylos andersonii is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.


  Classification

Scientific Name:
Arctostaphylos andersonii Gray
Common Name:
Anderson's manzanita
Family: Ericaceae
Element Code: PDERI04030
USDA Plants Symbol: ARAN2
Synonyms/Other Names:

Ecology and Life History

Lifeform: perennial evergreen shrub
Blooming Period: Nov-May Nov-May
Elevation: 60-760 (195-2495)
General Habitats: Broadleafed upland forest, Chaparral, North Coast coniferous forest
Microhabitat: Edges, Openings
Microhabitat Details:

Occurrence Data from the CNDDB

Total Occurrences: 64
Element Occurrence Ranks:
   Excellent (A) 5
   Good (B) 12
   Fair (C) 12
   Poor (D) 6
   None (X) 1
   Unknown (U) 28
California Endemic:  True
California Counties and Islands: Name (Code)
San Mateo (SMT), Santa Clara (SCL), Santa Cruz (SCR)
Quads: Name (Quad Code)
Big Basin (3712222), Davenport (3712212), Felton (3712211), Franklin Point (3712223), La Honda (3712233), Laurel (3712118), Loma Prieta (3712117), Mt. Madonna (3712116), Santa Cruz (3612281), Soquel (3612188), Watsonville East (3612186), Watsonville West (3612187), Woodside (3712243)

Threat List Data from the CNDDB

Threat List Total: 11
EOs with Threat Listed: Total EOs % of EOs
30 47 %
Other 14 21%
Road/trail construction/maint. 14 21%
Logging 11 17%
Non-native plant impacts 5 7%
Development 3 4%
Wood cutting or brush clearing 3 4%
Biocides 1 1%
Erosion/runoff 1 1%
Foot traffic/trampling 1 1%
Improper burning regime 1 1%
Recreational use (non-ORV) 1 1%

Notes

Confused with other species merged with it as varieties. Threatened by development and road maintenance. See Proceedings of the American Academy of Arts and Sciences 11:83 (1876) for original description, and North American Flora 29:98 (1914) for additional information.
Threats:
Taxonomy:
Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 3 February 2025].