CPC Plant Profile: Santa Rosa Island Manzanita
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Plant Profile

Santa Rosa Island Manzanita (Arctostaphylos confertiflora)

Photo Credit: ©2007 Neal Kramer
Description
  • Global Rank: G2 - Imperiled
  • Legal Status: Federally Endangered
  • Family: Ericaceae
  • State: CA
  • Nature Serve ID: 136943
  • Date Inducted in National Collection: 09/22/2021

Arctostaphylos confertiflora is a member of the Manzanita family that is endemic to the Santa Rosa Island (one of the Channel Islands) off the coast of Los Angeles, CA. Preferring mixed woodlands/chaparral and are known to thrive in various sediments, A. confertiflora can grow up to 2m high and can be identified by its distinct red-purple bark and evergreen leaves. Between Feb-April, clusters of white urn-shaped flowers bloom and eventually mature into apple-like fruit (characteristic to manzanitas). This species has been listed as Imperiled since 1997 due to the grazing and trampling of non-native cattle, elk, and deer.

Participating Institutions
Updates
  • 09/01/2020
  • Orthodox Seed Banking

Based on an September 2020 extract of the California Plant Rescue Database, Santa Barbara Botanic Garden holds 3 accessions of Arctostaphylos confertiflora in orthodox seed collection. There are as many as 2632 seeds of this species in their collection - although some may have been used for curation testing or sent to back up.

  • 09/01/2020
  • Orthodox Seed Banking

Based on an September 2020 extract of the California Plant Rescue Database, California Botanic Garden holds 7 accessions of Arctostaphylos confertiflora in orthodox seed collection. There are as many as 1708 seeds of this species in their collection - although some may have been used for curation testing or sent to back up.

  • 09/01/2020
  • Orthodox Seed Banking

Based on an September 2020 extract of the California Plant Rescue Database, National Laboratory for Genetic Resource Preservation (USDA-ARS) holds 4 accessions of Arctostaphylos confertiflora in orthodox seed collection. There are as many as 856 seeds of this species in their collection - although some may have been used for curation testing or sent to back up.

  • 08/05/2020
  • Seed Collection

Based on an August 2020 extract of the California Plant Rescue Database, Santa Barbara Botanic Garden has collected 14 seed accessions of Arctostaphylos confertiflora from 1 plant occurrences listed in the California Natural Diversity Database. These collections together emcompass 39 maternal plants

  • 01/01/2010

Soil loss, habitat alteration by alien mammals, native seabirds, vehicular traffic, overcollection for scientific or horticultural purposes, competition with alien plant taxa, and the chance of random extinction. habitat alteration by native seabi

  • 01/01/2010

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Photos
Nomenclature
Taxon Arctostaphylos confertiflora
Authority Eastw.
Family Ericaceae
CPC Number 211
ITIS 23478
USDA ARCO13
Common Names Santa Rosa Island Manzanita
Associated Scientific Names Arctostaphylos confertiflora | Arctostaphylos subcordata var. confertiflora
Distribution As its common name implies, Arctostaphylos confertiflora is endemic to the Santa Rosa Island off the coast of Los Angeles, CA. Santa Rosa Island is part of a cluster of islands altogether called the Channel Islands. 
State Rank
State State Rank
California S2
Habitat

Coastal dune, coastal bluff, grasslands, coastal sage scrub, chaparral, oak and ironwood woodlands, riparian woodlands, and conifer forest.

Ecological Relationships

A. confertiflora has beneficial relationships with local pollinating hummingbirds and insects. 

Pollinators
Common Name Name in Text Association Type Source InteractionID

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