Knotweed Spineflower
Chorizanthe polygonoides
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Long-spined Spineflower
Chorizanthe polygonoides var. longispina
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Knotweed Spineflower
Chorizanthe polygonoides var. polygonoides
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Prostrate Spineflower
Chorizanthe procumbens
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Monterey Spineflower
Chorizanthe pungens
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Ben Lomond Spineflower
Chorizanthe pungens var. hartwegiana
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Monterey Spineflower
Chorizanthe pungens var. pungens
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Straight-awned Spineflower
Chorizanthe rectispina
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Devil's Spineflower
Chorizanthe rigida
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Robust Spineflower
Chorizanthe robusta
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Scotts Valley Spineflower
Chorizanthe robusta var. hartwegii
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Robust Spineflower
Chorizanthe robusta var. robusta
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Mojave Spineflower
Chorizanthe spinosa
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Turkish Rugging
Chorizanthe staticoides
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Starlite Spineflower
Chorizanthe stellulata
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One-awn Spineflower
Chorizanthe uniaristata
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Sonoma Spineflower
Chorizanthe valida
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Potbellied Spineflower
Chorizanthe ventricosa
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Watson's Spineflower
Chorizanthe watsonii
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Wheeler's Spineflower
Chorizanthe wheeleri
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Riverside Spineflower
Chorizanthe xanti
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White-bracted Spineflower
Chorizanthe xanti var. leucotheca
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Pinyon Spineflower
Chorizanthe xanti var. xanti
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Giant Chinquapin
Chrysolepis chrysophylla
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Golden Chinquapin
Chrysolepis chrysophylla var. chrysophylla
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Giant Chinquapin
Chrysolepis chrysophylla var. minor
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Bush Chinquapin
Chrysolepis sempervirens
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Long Flowered Rabbitbrush
Chrysothamnus depressus
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Greene's Rabbitbrush
Chrysothamnus greenei
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Truckee Rabbitbrush
Chrysothamnus humilis
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Stickyleaf Rabbitbrush
Chrysothamnus viscidiflorus
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Chrysothamnus viscidiflorus ssp. axillaris
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Chrysothamnus viscidiflorus ssp. lanceolatus
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Downy Rabbitbrush
Chrysothamnus viscidiflorus ssp. puberulus
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Douglas' Rabbitbrush
Chrysothamnus viscidiflorus ssp. viscidiflorus
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Yellow Cups
Chylismia brevipes
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Golden Suncup
Chylismia brevipes ssp. brevipes
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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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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