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1,573 species in Crater Lake National Park
Carex exsiccata
Carex infirminervia
Carex integra
Carex leptopoda
Carex simulata
Carex utriculata
Castilleja affinis
Castilleja parviflora
Castilleja pilosa
Cephalanthera austiniae
Ceratina acantha
Chalciporus piperatus
Chalcosyrphus piger
Charadrius semipalmatus
Cherleria obtusiloba
Chiloscyphus polyanthos
Chondestes grammacus
Chorispora tenella
Chroicocephalus philadelphia
Chrysomphalina aurantiaca
Chrysomphalina chrysophylla
Chrysopa coloradensis
Chrysothamnus viscidiflorus
Cirsium scariosum
Cladonia chlorophaea
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