CNPS.ORG Inventory of Rare and Endangered Plants - 7th edition interface
v7-18mar 3-19-18
Status: record cirsium_hydrophilum_var._vaseyi - Wed, Dec. 8, 2021, 22:31 ET b
Cirsium hydrophilum var. vaseyi
common nameMt. Tamalpais thistle
CalPhotos image
more photos
© 1999 John Game  Follow image link for photo data.
life formperennial herb
CA Rare Plant Rank
List 1B.2
LIST 1B: Rare, threatened, or endangered in California and elsewhere.
     0.2: Fairly 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 listingNone  
where found
MAPS - Use v8 link below.

Topographic quads (4):
San Francisco North (466C) 3712274, San Rafael (467A) 3712285, Bolinas (467B) 3712286, San Geronimo (484C) 3812216
quad data info

Counties, states, regions:
Marin (MRN), San Francisco (SFO)
A reminder: Species not recorded for a given area may nonetheless be present, especially where favorable conditions occur.
CNPS habitats•Broadleafed upland forest (BUFrs)
•Chaparral (Chprl)
•Meadows and seeps (Medws)/serpentinite seeps
blooming period May-Aug  
elevation range240 - 620 meters
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.
full nameCirsium hydrophilum (Greene) Jeps. var. vaseyi (Gray) J.T. Howell
Version 8    INVENTORY VERSION 8 interface for this taxon, including GIS and more links

Additional information:
standard acronym  CIHYV Element Code  PDAST2E1G2
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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