Species Details

Cirsium hydrophilum var. hydrophilum

Suisun thistle

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Scientific Name:
Cirsium hydrophilum (Greene) Jeps. var. hydrophilum
Common Name:
Suisun thistle
Family: Asteraceae
Element Code: PDAST2E1G1
USDA Plants Symbol: CIHYH
Synonyms/Other Names:
Lifeform: perennial herb
Blooming Period: Jun-Sep
Elevation:
0 - 1 meters
0 - 5 feet
General Habitat:
  • Marshes and swamps (salt)
General Micro Habitat:
Micro Habitat:
Notes:
Rediscovered in 1989 by N. Havlik on Grizzly Isl. in the Suisun Marsh; now known from two occurrences. Threatened by altered hydrology and competition from native and non-native plants. Potentially threatened by foot traffic and trampling by cattle. Protected in part at Grizzly Island WA and Peytonia Slough ER (both DFG). See Proceedings of the Academy of Natural Sciences of Philadelphia 44:358 (1892) for original description.
Threats:
Taxonomy:
Other:
Total Occurrences: 4
Element Occurrence Ranks:
A B C D X U
1 1 1 1 0 0
Occurrence Status:
Historical >20 Years 2
Recent <=20 Years 2
Presence:
Presumed Extant 4
Possibly Extirpated 0
Presumed Extirpated 0
California Endemic:
California Island:
States: Name (Code)
California (CA)
California Counties and Islands: Name (Code)
Solano (SOL)
Quads: Name (Quad Code)
Denverton (3812128), Fairfield South (3812221)
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