Heartleaf Suncup
Chylismia cardiophylla
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Heartleaf Sun-cup
Chylismia cardiophylla ssp. cardiophylla
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Chylismia cardiophylla ssp. robusta
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Browneyes
Chylismia claviformis
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Browneyes
Chylismia claviformis ssp. aurantiaca
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Browneyes
Chylismia claviformis ssp. claviformis
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Browneyes
Chylismia claviformis ssp. cruciformis
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Clavate-fruited Primrose
Chylismia claviformis ssp. funerea
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Chylismia claviformis ssp. integrior
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Clavate-fruited Primrose
Chylismia claviformis ssp. lancifolia
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Peirson's Browneyes
Chylismia claviformis ssp. peirsonii
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Chylismia claviformis ssp. yumae
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Shockley's Evening-primrose
Chylismia heterochroma
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Chylismia munzii
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Chylismia walkeri
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Walker's Sun-cup
Chylismia walkeri ssp. tortilis
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Wingfruit Suncup
Chylismiella pterosperma
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Timwort
Cicendia quadrangularis
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Western Water Hemlock
Cicuta douglasii
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Water Hemlock
Cicuta maculata
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Spotted Water Hemlock
Cicuta maculata var. angustifolia
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Bolander's Water-hemlock
Cicuta maculata var. bolanderi
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Bolander's Woodreed
Cinna bolanderi
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Wood Reedgrass
Cinna latifolia
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Enchanter's Nightshade
Circaea alpina
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Small Enchanter's Nightshade
Circaea alpina ssp. pacifica
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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