Species Details

Arctostaphylos virgata

Marin manzanita

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Scientific Name:
Arctostaphylos virgata Eastw.
Common Name:
Marin manzanita
Family: Ericaceae
Element Code: PDERI041K0
USDA Plants Symbol: ARVI3
Synonyms/Other Names:
Lifeform: perennial evergreen shrub
Blooming Period: Jan-Mar
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Elevation:
60 - 700 meters
195 - 2295 feet
General Habitats:
  • Broadleafed upland forest
  • Closed-cone coniferous forest
  • Chaparral
  • North Coast coniferous forest
Microhabitat Details:
Microhabitat:
  • Granitic (sometimes)
  • Sandstone (sometimes)
Notes:
Known from approximately twenty occurrences. Threatened by fire suppression. See Trees and Shrubs 1:203 (1905) for original description.
Threats:
Taxonomy:
Threat List Total: 5
Total EOs % of EOs
EOs with Threat Listed: 16 50 %
THREAT LIST:
Other 9 28%
Road/trail construction/maint. 9 28%
Wood cutting or brush clearing 6 18%
Erosion/runoff 1 3%
Non-native plant impacts 1 3%
Total Occurrences: 32
Element Occurrence Ranks:
A B C D X U
1 4 3 2 0 22
Occurrence Status:
Historical >20 Years 27
Recent <=20 Years 5
Presence:
Presumed Extant 32
Possibly Extirpated 0
Presumed Extirpated 0
California Endemic:
California Island:
States: Name (Code)
California (CA)
California Counties and Islands: Name (Code)
Marin (MRN)
Quads: Name (Quad Code)
Bolinas (3712286), Double Point (3712287), Drakes Bay (3812218), Inverness (3812217), San Geronimo (3812216), San Rafael (3712285), Tomales (3812228)
Notes:
Definitions of codes following a county and/or quad:
* Presumed extirpated
(?) Occurrence confirmed, but possibly extirpated
Quad and county data is imported from the CNDDB. Species may be present in other areas where conditions are favorable. These data should NOT be substituted for pre-project review or for on-site surveys.
Presumed Extant
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