Cirsium hydrophilum var. hydrophilum
Common Name: Suisun thistle
Family: Asteraceae
Element Code: PDAST2E1G1
Full Name: Cirsium hydrophilum (Greene) Jeps. var. hydrophilum

2010 Doug Wirtz
Biology Glossary
Rarity Status Glossary
Occurrence Data from CDFW
California Natural Diversity Database Glossary
  • Total # of Known Element Occurrences: 4
  • Element Occurrence Ranks:
    A B C D X U
    1 1 1 0 0 1
  • Population Status:
    >20 yrs
    <=20 yrs
    1 3
  • Presence:
    Present Extant Possibly Extirpated Presumed Extirpated
    4 0 0
Notes Glossary
  • 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.
  • To submit rare plant observation data, use the CNDDB field survey form. Please see also the CNPS Rare Plant Data page.
  • Date Added: 1974-01-01
  • Last Update: 2010-03-15
Location Glossary
  • Elevation: 0 - 1 meters
  • California Endemic: yes
  • Other States:
  • California Counties and Islands:   name (code)
    Solano (SOL)
  • Quads:   name (DWR code) USGS code
    Denverton (481B) 3812128,  Fairfield South (482A) 3812221
  • Notes:
      Definitions of codes preceding a county and/or quad:
      * Presumed extirpated
      ? Uncertain about distribution or identity
      ?* Uncertain about distribution, but presumed extirpated if once present
      (?) Occurrence confirmed, but possibly extirpated
      Species may be present in other areas where conditions are favorable. This data should NOT be substituted for pre-project review or for on-site surveys.
Presumed Extant Presumed Extirpated or Unknown 485
Links to Leading Resources of Taxon Information
Suggested Citation
California Native Plant Society, Rare Plant Program. . Inventory of Rare and Endangered Plants of California (online edition, v8-03). Website [accessed ].

3812128=Denverton (481B) 3812128;3812221=Fairfield South (482A) 3812221