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Plant Profile

Santa Rosa Island Manzanita (Arctostaphylos confertiflora)

Global Rank: G2 - Imperiled
Legal Status: Federally Endangered
Family: Ericaceae
State: CA
Nature Serve ID: 136943
Lifeform: Shrub
Date Inducted in National Collection:

Description:

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.

Where is Santa Rosa Island Manzanita (Arctostaphylos confertiflora) located in the wild?

Habitat:

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

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.

States & Provinces:

Santa Rosa Island Manzanita can be found in California

Which CPC Partners conserve Santa Rosa Island Manzanita (Arctostaphylos confertiflora)?

California Botanic Garden

Not Sponsored

Conservation Actions

Assigned 06/09/17

Santa Barbara Botanic Garden

Not Sponsored

Conservation Actions

Assigned 06/13/17

University of California-Santa Cruz Arboretum & Botanic Garden

Not Sponsored

Assigned 01/17/19

CPC's Plant Sponsorship Program provides long term stewardship of rare plants in our National Collection. We are so grateful for all our donors who have made the Plant Sponsorship Program so successful. We are in the process of acknowledging all our wonderful plant sponsorship donors on our website. This is a work in progress and will be updated regularly.

Conservation Actions

09/01/2020

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

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

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

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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