CPC Plant Profile: Island Manzanita
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Plant Profile

Island Manzanita (Arctostaphylos insularis)

Description
  • Global Rank: G2 - Imperiled
  • Legal Status: N/A
  • Family: Ericaceae
  • State: CA
  • Nature Serve ID: 160425
  • Date Inducted in National Collection: 09/18/2021

Arctostaphylos insularis, like the neighboring Santa Rosa Manzanita (A. confertiflora), is also endemic to one of the Channel Islands off the coast of Santa Barbara, CA. Specifically, A. insularis is endemic to the Santa Cruz Island, the largest island, where it prefers a variety of habitats including chaparral, oak woodlands, pine forests, and coastal bluffs. The Island Manzanita is in bloom half the year (December-June) until it further matures into orange-brown colored drupe. With its waxy red limbs, characteristic among all Manzanita species, they are known to develop into tree-like structures up to 5 meters high.

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

Based on an September 2020 extract of the California Plant Rescue Database, California Botanic Garden holds 1 accessions of Arctostaphylos insularis in orthodox seed collection. There are as many as 19 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 1 seed accessions of Arctostaphylos insularis from 1 plant occurrences listed in the California Natural Diversity Database. These collections together emcompass an unknown number of maternal plants

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Photos
Nomenclature
Taxon Arctostaphylos insularis
Authority Greene ex Parry
Family Ericaceae
CPC Number 8547
ITIS 23494
USDA ARIN2
Common Names Island Manzanita | Canyon Sparkles
Associated Scientific Names Arctostaphylos insularis var. pubescens | Arctostaphylos insularis | Arctostaphylos insularis var. insularis | Uva-ursi insularis
Distribution This perennial shrub is native to Santa Cruz Island, one of the Channel Islands off the coast of Santa Barbara, CA.
State Rank
State State Rank
California SNR
Habitat

Typically, this shrub can be found among chapparal, oak woodland, and pine forest habitats where it can grow on coastal bluffs, rocky slopes, and canyon walls. Its preferred substrates are igneous substrates and even metamorphic rock (NatureServe 2016).

Ecological Relationships

Ecological relationships are unknown.

Pollinators
Common Name Name in Text Association Type Source InteractionID

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