Rose Thistle

Cirsium andersonii

Franciscan Thistle

Cirsium andrewsii

Arizona Thistle

Cirsium arizonicum

Arizona Thistle

Cirsium arizonicum var. arizonicum

Desert Mountain Thistle

Cirsium arizonicum var. tenuisectum

Indian Thistle

Cirsium brevistylum

Ashland Thistle

Cirsium ciliolatum

Slough Thistle

Cirsium crassicaule

Peregrine Thistle

Cirsium cymosum

Gray-green Thistle

Cirsium cymosum var. canovirens

Peregrine Thistle

Cirsium cymosum var. cymosum

Douglas' Thistle

Cirsium douglasii

Douglas' Thistle

Cirsium douglasii var. breweri

Douglas' Thistle

Cirsium douglasii var. douglasii

Fountain Thistle

Cirsium fontinale

Mount Hamilton Fountain Thistle

Cirsium fontinale var. campylon

Crystal Springs Fountain Thistle

Cirsium fontinale var. fontinale

San Luis Obispo Fountain Thistle

Cirsium fontinale var. obispoense

Suisun Thistle

Cirsium hydrophilum

Suisun Thistle

Cirsium hydrophilum var. hydrophilum

Mount Tamalpais Thistle

Cirsium hydrophilum var. vaseyi

Cirsium inamoenum

Mojave Thistle

Cirsium mohavense

Desert Thistle

Cirsium neomexicanum

Cobweb Thistle

Cirsium occidentale

California Thistle

Cirsium occidentale var. californicum

Snowy Thistle

Cirsium occidentale var. candidissimum

Compact Cobwebby Thistle

Cirsium occidentale var. compactum

Coulter's Thistle

Cirsium occidentale var. coulteri

Cuesta Ridge Thistle

Cirsium occidentale var. lucianum

Cobwebby Thistle

Cirsium occidentale var. occidentale

Venus Thistle

Cirsium occidentale var. venustum

Brownie Thistle

Cirsium quercetorum

Fewleaf Thistle

Cirsium remotifolium

Pacific Fringed Thistle

Cirsium remotifolium var. odontolepis

Klamath Thistle

Cirsium remotifolium var. rivulare

Surf Thistle

Cirsium rhothophilum

Meadow Thistle

Cirsium scariosum

Dinnerplate Thistle

Cirsium scariosum var. americanum

Southern Meadow Thistle

Cirsium scariosum var. citrinum

Rosette Thistle

Cirsium scariosum var. congdonii

La Graciosa Thistle

Cirsium scariosum var. loncholepis

Shasta Valley Thistle

Cirsium scariosum var. robustum

Wavyleaf Thistle

Cirsium undulatum