CPC National Collection Plant Profile

Arctostaphylos densiflora

Photographer:
Dieter Wilken

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CPC National Collection Plant Profile

Arctostaphylos densiflora


Family: 
Ericaceae  
Common Name: 
Vine Hill manzanita
Author: 
M.S. Baker
Growth Habit: 
Subshrub, Shrub
CPC Number: 
213

Distribution
Protection
Conservation
References


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Arctostaphylos densifloraenlarge
Photographer: Dieter Wilken
dwilken[at]sbbg.org
Image Owner: personal


Arctostaphylos densiflora is Not Sponsored
Primary custodian for this plant in the CPC National Collection of Endangered Plants is: 

 
Arctostaphylos densiflora


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.

Distribution & Occurrence

State Range
  California
State Range of  Arctostaphylos densiflora
Habitat
  Roadside banks and neighboring areas in chaparral habitat with acid marine sand (York 1987).

Distribution
  The Northcoast Range in the vicinity of Vine Hill in Sonoma County, California (York 1987).

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

Protection

Global Rank:  
G1
 
12/22/1997
Guide to Global Ranks
Federal Status:  
SC
 
1/19/1996
Guide to Federal Status
Recovery Plan:  
No
 

State/Area Protection
  State/Area Rank Status Date  
  California S1.1 E 1/1/1999  

Conservation, Ecology & Research

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)

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

Current Research Summary
  None known.

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

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

Ex Situ Needs
  Maintain a genetically representative seed bank.

References

Books (Single Authors)

Skinner, M.W.; Pavlik, B.M. 1997. Inventory of rare and endangered vascular plants of California: Electronic Inventory Update of 1994, 5th edition. Sacramento: California Native Plant Society.

Books (Sections)

Kartesz, J.T. 1999. A synonymized checklist of the vascular flora of the U.S., Canada, and Greenland. In: Kartesz, J.T.; Meacham, C.A., editors. Synthesis of the North American Flora, Version 1.0. North Carolina Botanical Garden. Chapel Hill, NC.

York, R.P. 1987. California's most endangered plants. In: Elias, T.S., editor. Conservation and management of rare and endangered plants. California Native Plant Society. Sacramento. p 109-120.

Electronic Sources

(2000). CalFlora: on California plants for education, research and conservation. [web application]. Berkeley, California: The CalFlora Database [a non-profit organization]. http://www.calflora.org/.. Accessed: 2002.

CalPhotos. (2002). CalPhotos: Berkely Digital Library Project. University of California, Berkeley. http://elib.cs.berkeley.edu/photos/. Accessed: 2002.

CDFG. (2002). California's Plants and Animals, Threatened and Endangered Plants. List and Species Accounts. California Department of Fish and Game, Habitat Conservation Planning Branch. http://www.dfg.ca.gov/hcpb/species/t_e_spp/teplant/teplanta.shtml. Accessed: 2002.

Lowe, M. (1999). The Gardner's Guide to the Sausal Creek Watershed: A Home Companion to Growing Native Plants. Friends of Sausal Creek. Produced by the Aquatic Outreach Institute as part of the Sausal Creek Watershed Awareness Program. http://www.aoinstitute.org/sausal/aboutCreek/natives/index.html. Accessed: 2002.

Journal Articles

Kelly, V.R.; Parker, V.T. 1990. Seed bank survival and dynamics in sprouting and nonsprouting Arctostaphylos species. American Midland Naturalist. 124: 114-123.

Schuch, U.K.; Burger, D.W. 1997. Water use and crop coefficients of woody ornamentals in containers. Journal of the American Society of Horticultural Science. 122, 5: 727-734.

USFWS. 1993. Review of plant taxa for listing as endangered or threatened species. Federal Register. 58, 188: 51144-51190.

Vlamis, J.; Raabe, R.D. 1985. Copper deficiency of manzanita grown in a bark-sand mixture. Hortscience. 20, 1: 61-62.

Winner, W.E.; Koch,G W.; Mooney, H.A. 1982. Ecology of sulfur dioxide resistance 4. Predicting metabolic responses of fumigated shrubs and trees. Oecologia, Berlin. 52, 1: 16-21.


  This profile was updated on 3/4/2010
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