Species Details

Cirsium hydrophilum var. vaseyi

Mt. Tamalpais thistle

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Scientific Name:
Cirsium hydrophilum (Greene) Jeps. var. vaseyi (Gray) J.T. Howell
Common Name:
Mt. Tamalpais thistle
Family: Asteraceae
Element Code: PDAST2E1G2
USDA Plants Symbol: CIHYV
Synonyms/Other Names:
Lifeform: perennial herb
Blooming Period: May-Aug
Elevation:
240 - 620 meters
785 - 2035 feet
General Habitat:
  • Broadleafed upland forest
  • Chaparral
  • Meadows and seeps
General Micro Habitat:
Micro Habitat:
  • Seeps
  • Serpentinite
Notes:
Known from fewer than 20 occurrences on Mt. Tamalpais. Threatened by road construction and non-native plants. See Synoptical Flora of North America 1(2):403-404 (1884) for original description.
Threats:
Taxonomy:
Other:
Total Occurrences: 14
Element Occurrence Ranks:
A B C D X U
2 6 0 0 1 5
Occurrence Status:
Historical >20 Years 9
Recent <=20 Years 5
Presence:
Presumed Extant 13
Possibly Extirpated 0
Presumed Extirpated 1
California Endemic:
California Island:
States: Name (Code)
California (CA)
California Counties and Islands: Name (Code)
Marin (MRN), San Francisco (SFO)
Quads: Name (Quad Code)
Bolinas (3712286), San Francisco North (3712274), San Geronimo (3812216), San Rafael (3712285)
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.

Map

Presumed Extant
Counties   Quads