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4,501 species in Indiana Dunes National Park
Carex cristatella
Chenopodium pratericola
Cinna arundinacea
Cladonia peziziformis
Cladonia pleurota
Cladonia verticillata
Clostera strigosa
Colias philodice
Colopha ulmicola
Copelatus glyphicus
Coprinellus disseminatus
Copris fricator
Coreopsis palmata
Corispermum pallasii
Cornus obliqua
Cortinarius iodeoides
Costaconvexa centrostrigaria
Crepidotus crocophyllus
Cyperus houghtonii
Cyperus strigosus
Datana ministra
Dicentra canadensis
Dichanthelium sphaerocarpon
Dichanthelium spretum
Didymium squamulosum
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