CPC Plant Profile: Suisun Thistle
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Plant Profile

Suisun Thistle (Cirsium hydrophilum var. hydrophilum)

  • Global Rank: T1 - Critically Imperiled
  • Legal Status: Federally Endangered
  • Family: Asteraceae
  • State: CA
  • Nature Serve ID: 161085
  • Date Inducted in National Collection: 10/26/2021

Participating Institutions
  • 09/01/2020
  • Orthodox Seed Banking

Based on an September 2020 extract of the California Plant Rescue Database, California Botanic Garden holds 3 accessions of Cirsium hydrophilum var. hydrophilum in orthodox seed collection. There are as many as 1175 seeds of this species in their collection - although some may have been used for curation testing or sent to back up.

  • 08/05/2020
  • Seed Collection

Based on an August 2020 extract of the California Plant Rescue Database, California Botanic Garden has collected 1 seed accessions of Cirsium hydrophilum var. hydrophilum from 1 plant occurrences listed in the California Natural Diversity Database. These collections together emcompass an unknown number of maternal plants

  • 01/01/2010

habitat conversion, water pollution, changes in salinity, indirect effects of urbanization, stochastic events, mosquito abatement activities (including off-road vehicle use), competition with non-native vegetation, regulatory mechanisms, and other

  • 01/01/2010

a few thousand individuals


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Taxon Cirsium hydrophilum var. hydrophilum
Authority (Greene) Jeps.
Family Asteraceae
CPC Number 957
ITIS 527372
Common Names Suisun Thistle
Associated Scientific Names Cirsium hydrophilum var. hydrophilum | Cirsium hydrophilum | Cirsium vaseyi var. hydrophilum
Distribution NA
State Rank
State State Rank
California S1

salt water or brackish tidal marshes fringing San Pablo and Suisun Bays in the San Francisco Bay area of northern California

Ecological Relationships

Common Name Name in Text Association Type Source InteractionID

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