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David J. Keil +
(A. Gray) D. J. Keil & C. E. Turner +
Cirsium californicum +
California thistle +
100–2200 m +
Pine-oak woodlands, riparian woodlands, chaparral, openings in mixed evergreen forests, roadsides +
Flowering spring–summer (Apr–Aug). +
Illustrated +  and Endemic +
Cirsium bernardinum +, Cirsium californicum var. bernardinum +  and Cirsium californicum subsp. pseudoreglense +
Cirsium occidentale var. californicum +
Cirsium occidentale +
variety +