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4,501 species in Indiana Dunes National Park
Crematogaster cerasi
Creosphaeria sassafras
Crepidotus fraxinicola
Crepis pulchra
Crinipellis zonata
Crocus chrysanthus
Croton glandulosus
Cruciata pedemontana
Crucibulum parvulum
Cucumis sativus
Culiseta alaskaensis
Cuphophyllus borealis
Cuphophyllus virgineus
Cuscuta cephalanthi
Cuscuta coryli
Cuscuta polygonorum
Cuterebra fontinella
Cyanoboletus cyaneitinctus
Cyclocephala lurida
Cycloneda sanguinea
Cyclosa turbinata
Cydia latiferreana
Cylindrocystis brebissonii
Cymbalaria muralis
Cymbiodyta vindicata
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