CPC Plant Profile: Vine Hill Manzanita
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Plant Profile

Vine Hill Manzanita (Arctostaphylos densiflora)

This shot shows the ends of the branches, leaves and flowers of this manzanita. Photo Credit: Dieter Wilken
Description
  • Global Rank: G1 - Critically Imperiled
  • Legal Status: N/A
  • Family: Ericaceae
  • State: CA
  • Nature Serve ID: 150824
  • Date Inducted in National Collection: 03/06/1993

The Vine Hill manzanita is an extremely rare species that is endemic to Sonoma County, California. Three of the four historic occurrences of this species have been extirpated. In the 1990's the California Native Plants Society (CNPS) purchased the land where this last known population occurs and has been managing it for the species since then. (York 1987) The greatest threats to the 20-30 individuals left in this remaining population include roadside maintenance and a fungal disease that was reportedly affecting these plants in 1987. (York 1987) This rare manzanita is a low, spreading evergreen shrub that is in the heath family (Ericaceae). It has shiny green leaves, black branches, and small white-to-pink flowers.

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Updates
Nature Serve Biotics
  • 05/02/2017

Although this showy shrub is available commercially, it was thought to be extirpated until a few native shrubs were discovered at its only known site. Endemic to California, it is threated by a fungal infection.(NHS February Monthly Report, 1986)

  • 01/01/2010

Roadside maintenance A fungal disease present in the remaining population (York 1987)

  • 01/01/2010

There is only one extant population consisting of 20-30 individuals in Sonoma Co. CA (York 1987).

  • 01/01/2010

None known.

  • 01/01/2010

The remaining plants are located on land purchased by the California Native Plant Society for the purpose of protecting the remaining individuals (York 1987)

  • 01/01/2010

Limit roadside maintenance near the population Research is badly needed on the fungus that is causing die-off in these plants (York 1987)

  • 01/01/2010

Maintain a genetically representative seed bank.

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Photos
Nomenclature
Taxon Arctostaphylos densiflora
Authority M.S. Baker
Family Ericaceae
CPC Number 213
ITIS 23481
USDA ARDE2
Common Names Vine Hill manzanita
Associated Scientific Names Arctostaphylos densiflora | Arctostaphylos uva-ursi var. densiflora
Distribution The Northcoast Range in the vicinity of Vine Hill in Sonoma County, California (York 1987).
State Rank
State State Rank
California S1
Habitat

Roadside banks and neighboring areas in chaparral habitat with acid marine sand (York 1987).

Ecological Relationships

The flowers of this species provide nectar for butterflies and native bees in the spring, berries provide food for birds in the late summer, and the low-growing habit of the plant make it a good home for California valley quail and wrentit nests. (Lowe 1999)

Pollinators
Common Name Name in Text Association Type Source InteractionID
Reintroduction
Lead Institution State Reintroduction Type Year of First Outplanting

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