Taxon  Report   2134    
Cirsium hydrophilum  (Greene) Jeps.  var. vaseyi  (A. Gray) J. T. Howell
Mt. Tamalpais thistle,  Vasey's thistle
Cirsium hydrophilum var. vaseyi, a dicot, is a perennial herb that is native to California, and is endemic (limited) to California.
California Rare Plant Rank: 1B.2 (rare, threatened, or endangered in CA and elsewhere).   CNPS Inventory
Observation Hotline
(observation details)
one or more occurrences
within a 7.5-minute quadrangle

Bloom Period
Genus: Cirsium
Parent: Cirsium hydrophilum
Wetlands: Occurs in wetlands

Serpentine affinity: 6.1; (strict endemic)

Habitat: seeps

Communities: Mixed Evergreen Forest, Chaparral, wetland-riparian

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 availability from CNPLX
Commercial availability unknown.
Jepson eFlora


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: Oct 18, 2019).