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4,501 species in Indiana Dunes National Park
Cortinarius rubripes
Cortinarius violaceus
Corythucha marmorata
Cosmopepla lintneriana
Cosmos bipinnatus
Crataegus coccinea
Crataegus crus-galli
Crataegus holmesiana
Craterellus calyculus
Craterium concinnum
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
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