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 endemic (limited) to California.
California Rare Plant Rank: 1B.2 (rare, threatened, or endangered in CA and elsewhere).   CNDDB
Siskiyou Del Norte Modoc Humboldt Shasta Lassen Trinity Plumas Tehama Butte Mendocino Glenn Sierra Yuba Lake Nevada Colusa Placer Sutter El Dorado Yolo Alpine Napa Sonoma Sacramento Mono Amador Solano Calaveras Tuolumne San Joaquin Marin Contra Costa Alameda Santa Cruz Mariposa Madera San Francisco San Mateo Merced Fresno Stanislaus Santa Clara Inyo San Benito Tulare Kings Monterey San Bernardino San Luis Obispo Kern Santa Barbara Ventura Los Angeles Riverside Orange San Diego Imperial
Observation Search
(49 records)
one or more occurrences
within a 7.5-minute quadrangle

Bloom Period
Family: Asteraceae  
Genus: Cirsium
Parent: Cirsium hydrophilum

Wetlands: Occurs in wetlands

Ultramafic affinity: 6 - strict endemic

Habitat: seeps

Communities: Mixed Evergreen Forest, Chaparral, wetland-riparian

Name Status:
Accepted by JEF + CNPS + PLANTS

Alternate Names:
PLANTSCirsium montigenum
PLANTSCirsium vaseyi
PLANTSCnicus breweri var. vaseyi
More information about  Cirsium hydrophilum var. vaseyi

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]. 2022. Berkeley, California: The Calflora Database [a non-profit organization]. Available:   (Accessed: 05/25/2022).