Rose Thistle
Cirsium andersonii
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Franciscan Thistle
Cirsium andrewsii
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Arizona Thistle
Cirsium arizonicum
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Arizona Thistle
Cirsium arizonicum var. arizonicum
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Desert Mountain Thistle
Cirsium arizonicum var. tenuisectum
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Indian Thistle
Cirsium brevistylum
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Ashland Thistle
Cirsium ciliolatum
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Slough Thistle
Cirsium crassicaule
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Peregrine Thistle
Cirsium cymosum
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Gray-green Thistle
Cirsium cymosum var. canovirens
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Peregrine Thistle
Cirsium cymosum var. cymosum
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Douglas' Thistle
Cirsium douglasii
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Douglas' Thistle
Cirsium douglasii var. breweri
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Douglas' Thistle
Cirsium douglasii var. douglasii
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Fountain Thistle
Cirsium fontinale
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Mount Hamilton Fountain Thistle
Cirsium fontinale var. campylon
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Crystal Springs Fountain Thistle
Cirsium fontinale var. fontinale
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San Luis Obispo Fountain Thistle
Cirsium fontinale var. obispoense
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Suisun Thistle
Cirsium hydrophilum
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Suisun Thistle
Cirsium hydrophilum var. hydrophilum
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Mount Tamalpais Thistle
Cirsium hydrophilum var. vaseyi
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Cirsium inamoenum
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Greene's Thistle
Cirsium inamoenum var. inamoenum
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Mojave Thistle
Cirsium mohavense
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Desert Thistle
Cirsium neomexicanum
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Cobweb Thistle
Cirsium occidentale
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California Thistle
Cirsium occidentale var. californicum
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Snowy Thistle
Cirsium occidentale var. candidissimum
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Compact Cobwebby Thistle
Cirsium occidentale var. compactum
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Coulter's Thistle
Cirsium occidentale var. coulteri
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Cuesta Ridge Thistle
Cirsium occidentale var. lucianum
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Cobwebby Thistle
Cirsium occidentale var. occidentale
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Venus Thistle
Cirsium occidentale var. venustum
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Lost Thistle
Cirsium praeteriens
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Brownie Thistle
Cirsium quercetorum
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Fewleaf Thistle
Cirsium remotifolium
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Pacific Fringed Thistle
Cirsium remotifolium var. odontolepis
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Remote-leaved Thistle
Cirsium remotifolium var. remotifolium
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Klamath Thistle
Cirsium remotifolium var. rivulare
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Surf Thistle
Cirsium rhothophilum
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Meadow Thistle
Cirsium scariosum
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Dinnerplate Thistle
Cirsium scariosum var. americanum
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Southern Meadow Thistle
Cirsium scariosum var. citrinum
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Rosette Thistle
Cirsium scariosum var. congdonii
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La Graciosa Thistle
Cirsium scariosum var. loncholepis
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Shasta Valley Thistle
Cirsium scariosum var. robustum
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Elk Thistle
Cirsium scariosum var. scariosum
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Wavyleaf Thistle
Cirsium undulatum