- Calandrinia breweri
- Calandrinia ciliata
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- Calochortus albus
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- Calochortus amabilis
- Calochortus amoenus
- Calochortus luteus
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- Calochortus obispoensis
- Calochortus tiburonensis
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- Calochortus uniflorus
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- Calycadenia multiglandulosa
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- Calycanthus occidentalis
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- Calypso bulbosa
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- Calystegia macrostegia ssp. cyclostegia
- Calystegia soldanella
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- Calystegia subacaulis
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- Camissonia cheiranthifolia
- Camissonia cheiranthifolia ssp. suffruticosa
- Camissonia micrantha
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- Camissonia ovata
- Capsella bursa-pastoris
- Cardamine californica
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- Carduus pycnocephalus
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- Carpobrotus chilensis
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- Castilleja ambigua ssp. ambigua
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- Castilleja attenuata
- Castilleja densiflora ssp. gracilis
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- Castilleja exserta
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- Castilleja foliolosa
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- Ceanothus cuneatus
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- Ceanothus griseus
- Ceanothus papillosus var. papillosus
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- Ceanothus thyrsiflorus
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- Centaurea calcitrapa
- Centaurea melitensis
- Centaurea solstitialis
- Centaurium davyi
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- Cephalanthus occidentalis var. californicus
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- Cerastium arvense
- Cerastium glomeratum
- Cercis occidentalis
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- Cercocarpus betuloides
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- Chamomilla suaveolens
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- Chenopodium album
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- Chenopodium californicum
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- Chenopodium murale
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- Chlorogalum pomeridianum
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- Cichorium intybus
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- Cicuta douglasii
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- Cirsium occidentale
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- Cirsium quercetorum
- Cirsium vulgare
- Clarkia amoena
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- Clarkia epilobioides
- Clarkia purpurea
- Clarkia rubicunda
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- Claytonia perfoliata
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- Clematis lasiantha
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- Clematis ligusticifolia
- Collinsia heterophylla
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- Conium maculatum
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- Corallorhiza maculata
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- Corylus cornuta var. californica
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- Cotula coronopifolia
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- Crataegus douglasii
- Cupressus goveniana ssp. goveniana
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- Cupressus sargentii
- Cynodon dactylon
- Cynoglossum grande
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- Cynosurus echinatus
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