C

Calandrinia ciliata (Red maids)
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Calochortus albus (Fairy lantern)
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Calochortus catalinae (Catalina mariposa lily)
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Calochortus clavatus (Yellow mariposa lily)
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Calochortus plummerae (Plummer's mariposa lily)
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Calochortus splendens (Lilac mariposa lily)
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Calochortus venustus (Butterfly mariposa lily)
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Calystegia macrostegia (Morning glory)
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Camissonia bistorta (Suncups)
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Camissonia californica (Mustard evening primrose)
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Cardamine californica (Milkmaids)
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Carduus pycnocephalus* (Italian thistle)
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Castilleja affinis (Indian paintbrush)
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Castilleja exserta (Owl's clover)
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Ceanothus crassifolius (Hoaryleaf ceanothus)
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Ceanothus megacarpus (Bigpod ceanothus)
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Ceanothus oliganthus (Hairyleaf ceanothus)
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Ceanothus spinosus (Greenbark ceanothus)
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Centaurea melitensis* (Tocalote)
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Centaurium venustum (Canchalagua)
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Chaenactis artemisiifolia (White pincushion)
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Chaenactis glabriuscula (Yellow pincushion)
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Chamaesyce albomarginata (Rattlesnake weed)
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Chamomilla suaveolens* (Pineapple weed)
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Chlorogalum pomeridianum (Soap plant)
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Chorizanthe staticoides (Turkish rugging)
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Cichorium intybus* (Chicory)
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Cirsium occidentale ssp. californicum (California thistle)
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Cirsium occidentale ssp. occidentale (Cobweb thistle)
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Cirsium vulgare* (Bull thistle)
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Cistus creticus* (Pink rockrose)
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Clarkia bottae (Farewell-to-spring)
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Clarkia cylindrica (Speckled clarkia)
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Clarkia epilobioides (Willow-herb clarkia)
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Clarkia purpurea (Purple clarkia)
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Clarkia unguiculata (Elegant clarkia)
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Claytonia perfoliata (Miner's lettuce)
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Collinsia heterophylla (Chinese houses)
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Conium maculatum* (Poison hemlock)
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Conyza bonariensis* (Little horseweed)
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Conyza canadensis (Horseweed)
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Cordylanthus rigidus (Bird's beak)
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Croton californicus (California croton)
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Cryptantha intermedia (Popcorn flower)
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Cucurbita foetidissima (Stinking gourd)
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Cuscuta californica (Dodder)
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