Overview

Distribution

Global Range: Marin County; Pt. Reyes, Muir Woods, Bolinas and Tomales vicinity, California.

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Localities documented in Tropicos sources

Arctostaphylos virgata Eastw.:
United States (North America)

Note: This information is based on publications available through Tropicos and may not represent the entire distribution. Tropicos does not categorize distributions as native or non-native.
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© Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO 63110 USA

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Physical Description

Type Information

Syntype for Arctostaphylos virgata Eastw.
Catalog Number: US 963125
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Original publication and alleged type specimen examined
Preparation: Pressed specimen
Collector(s): A. Eastwood
Year Collected: 1902
Locality: Mt. Tamalpais, Marin, California, United States, North America
  • Syntype: Eastwood, A. 1905. Trees & Shrubs. 1 (4): 203.
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© Smithsonian Institution, National Museum of Natural History, Department of Botany

Source: National Museum of Natural History Collections

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Syntype for Arctostaphylos virgata Eastw.
Catalog Number: US 440912
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Original publication and alleged type specimen examined
Preparation: Pressed specimen
Collector(s): A. Eastwood
Year Collected: 1902
Locality: Mt. Tamalpais, Marin, California, United States, North America
  • Syntype: Eastwood, A. 1905. Trees & Shrubs. 1 (4): 203.
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© Smithsonian Institution, National Museum of Natural History, Department of Botany

Source: National Museum of Natural History Collections

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Ecology

Habitat

Comments: Bishop pine forest, mixed evergreen forest and redwood forest. On sandstone or granitic soil at 60-700 m elevation (California Department of Fish and Game 1997).

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Population Biology

Number of Occurrences

Note: For many non-migratory species, occurrences are roughly equivalent to populations.

Estimated Number of Occurrences: 6 - 20

Comments: Known from fewer than twenty occurrences (Skinner 1997).

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Conservation

Conservation Status

National NatureServe Conservation Status

United States

Rounded National Status Rank: N2 - Imperiled

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NatureServe Conservation Status

Rounded Global Status Rank: G2 - Imperiled

Reasons: Endemic to California, Arctostaphylos virgata is known from fewer than twenty occurrences, all of which are in Marin County. The manzanita does occur within Muir Woods and Point Reyes National Seashore boundaries, which have management plans. This species is threatened by fire suppression, potential road development, and shading in mature forests.

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Threats

Comments: Threatened by fire suppression, potential road development, and shading in mature forests (CNPS 2001, CNDDB 2003).

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Wikipedia

Arctostaphylos virgata

Arctostaphylos virgata is a species of manzanita known by the common names Bolinas manzanita and Marin manzanita.

Contents

Distribution[edit]

It is endemic to Marin County, California, where it is known from only about 20 occurrences in the forests and chaparral of the coastal hills. It is a dominant shrub in some spots in the maritime chaparral plant community at Point Reyes National Seashore.[1] Like many other species in this type of plant community, it is dependent on wildfire and its survival is threatened by fire suppression.

Description[edit]

Arctostaphylos virgata is a large shrub, reaching at least two meters tall and known to exceed 5 meters in height, becoming treelike. Its twisted branches are covered in deep red bark. The smaller twigs are coated in woolly fibers and studded with glandular bristles which exude sticky resins. The shiny green leaves are rough and sticky in texture, oval to widely lance-shaped, and up to 5 centimeters long. The inflorescence is a dense cluster of urn-shaped manzanita flowers. The fruit is a sticky, bristly drupe about 7 centimeters wide.

See also[edit]

References[edit]

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