Taxon  Report   2134    
Cirsium hydrophilum  (Greene) Jeps.  var. vaseyi  (A. Gray) J. T. Howell
Mt. Tamalpais thistle,  Vasey's thistle
Cirsium hydrophilum var. vaseyi
© 2018 Eliezer Margolis
Photos from
CalPhotos / Calflora
Cirsium hydrophilum var. vaseyi
© 2018 Woody Elliott
Cirsium hydrophilum var. vaseyi
© 2011 Thomas Reyes
Cirsium hydrophilum var. vaseyi, a dicot, is a perennial herb that is native to California, 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)

point, line, or polygon

one or more occurrences
within a 7.5-minute quadrangle

Plant Characteristics
and Associations

Bloom Period
Cirsium hydrophilum var. vaseyi
© 2012 Alan Castner
Genus: Cirsium
Parent: Cirsium hydrophilum
Communities: Mixed Evergreen Forest, Chaparral, wetland-riparian

Wetlands: Occurs in wetlands

Serpentine affinity: 6.1; (strict endemic)

Habitat: seeps

Name Status:
Accepted by JEF + CNPS + PLANTS

Alternate Names:
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   /   Google Images
Jepson eFlora

Records from the Consortium of California Herbaria

ITIS Original Publication citation


Search the International Plants Names Index

Search (Flora of North America)

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]. 2019. Berkeley, California: The Calflora Database [a non-profit organization]. Available:   (Accessed: Jan 19, 2019).