Taxon  Report   2134 
Cirsium hydrophilum  (E. Greene) Jepson  var. vaseyi  (A. Gray) J. Howell
Mt. tamalpais thistle,  Vasey's thistle
Cirsium hydrophilum var. vaseyi
© 2011 Thomas Reyes
Click on a photo to see it bigger.
Cirsium hydrophilum var. vaseyi
© 2009 Vernon Smith
Cirsium hydrophilum var. vaseyi
© 2011 Vernon Smith
Cirsium hydrophilum var. vaseyi, a dicot, is a perennial herb that is native to California and is endemic (limited) to California.
CNPS Rare Plant Rank: 1B.2 (rare, threatened, or endangered in CA and elsewhere).   8th Edition

Interactive Distribution Map

Observation Hotline
(observation details + photos)

point, line, or polygon

one or more occurrences
within a 7.5-minute quadrangle

Plant Characteristics
and Associations

Bloom Period
Cirsium hydrophilum var. vaseyi
© 1999 John Game
Genus: Cirsium
Parent Record Cirsium hydrophilum
Mixed Evergreen Forest, Chaparral, wetland-riparian
Habitat: seeps
Wetlands: Occurs in wetlands
AFFINITY to serpentine soil:   6.1 (strict endemic)   [Safford et al 2005]
Distribution by County 

Add an Observation of  Cirsium hydrophilum var. vaseyi

Name Status:
Accepted by TJM2 + CNPS + PLANTS + JM93
Alternate Names:
(according to)

PLANTS: Cirsium montigenum
PLANTS: Cirsium vaseyi
PLANTS: Cnicus breweri var. vaseyi
More information about  Cirsium hydrophilum var. vaseyi
Nursery / seed vendor availability from CNPLX
Commercial availability unknown.
Landscaping information from Calscape
Photos on CalPhotos / Google Images
Jepson eFlora

Records from the Consortium of California Herbaria

Original Publication citation (ITIS)


Search the International Plants Names Index

Search (Flora of North America)

Search the Lady Bird Johnson Wildflower Center

website references from Google

Suggested Citation
Calflora: Information on California plants for education, research and conservation,
with data contributed by public and private institutions and individuals, including the Consortium of California Herbaria.
[web application]. 2018. Berkeley, California: The Calflora Database [a non-profit organization].
Available:   (Accessed: Feb 21, 2018).

The information on this page comes from diverse sources. None of the links are sponsored.