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4,501 species in Indiana Dunes National Park
Cycnia oregonensis
Cynoglossum officinale
Cypripedium parviflorum
Cyrtophorus verrucosus
Dacrymyces chrysospermus
Daedaleopsis septentrionalis
Daldinia childiae
Daldinia concentrica
Dasymutilla occidentalis
Datana contracta
Deidamia inscriptum
Delphinia picta
Dermestes caninus
Dermestes lardarius
Deroceras laeve
Dichanthelium huachucae
Dichanthelium lanuginosum
Dichanthelium polyanthes
Dicranum condensatum
Dicranum flagellare
Dicranum polysetum
Dictyna bostoniensis
Didymium iridis
Diphasiastrum tristachyum
Dipsacus laciniatus
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