CNPS.ORG Inventory of Rare and Endangered Plants - 7th edition interface
v7-18mar 3-19-18
Status: record cirsium_hydrophilum_var._hydrophilum - Wed, Dec. 8, 2021, 23:47 ET b
Cirsium hydrophilum var. hydrophilum
common nameSuisun thistle
CalPhotos image
more photos
Roxanne Bittman © 2002 CNPS  Follow image link for photo data.
life formperennial herb
CA Rare Plant Rank
List 1B.1
LIST 1B: Rare, threatened, or endangered in California and elsewhere.
     0.1: Seriously endangered in California
state rank
S1      ranking system key
global rank
G2T1      ranking system key
Where did the "RED" code go?
CA state listingNone  
federal listingEndangered  11/20/97
where found
MAPS - Use v8 link below.

Topographic quads (2):
Denverton (481B) 3812128, Fairfield South (482A) 3812221
quad data info

Counties, states, regions:
Solano (SOL)
A reminder: Species not recorded for a given area may nonetheless be present, especially where favorable conditions occur.
CNPS habitats•Marshes and swamps (MshSw)(salt)
blooming period Jun-Sep  
elevation range0 - 1 meters
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.
full nameCirsium hydrophilum (Greene) Jeps. var. hydrophilum
Version 8    INVENTORY VERSION 8 interface for this taxon, including GIS and more links

Additional information:
standard acronym  CIHYH Element Code  PDAST2E1G1
CalFlora species this taxon    CalFlora genus related taxa
Jepson Online Jepson Interchange  Jepson Manual and other resources
Google search
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Suggested citation: California Native Plant Society (CNPS). 2018. Inventory of Rare and Endangered Plants (online edition, v7-18mar). California Native Plant Society. Sacramento, CA. Accessed on Wed, Dec. 8, 2021 from

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