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4,501 species in Indiana Dunes National Park
Hypsopygia costalis
Ictiobus niger
Idia aemula
Idionella rugosa
Illinoia liriodendri
Ilybius biguttulus
Impatiens walleriana
Inocutis dryophila
Inocybe aeruginascens
Inocybe grammata
Inocybe pallida
Inocybe serotina
Inocybe velicopia
Inula helenium
Iodanthus pinnatifidus
Iris pallida
Irpiciporus mollis
Isomira oblongula
Isotria verticillata
Itea virginica
Jackrogersella multiformis
Japanagromyza viridula
Juncus arcticus
Juncus brachycarpus
Juncus compressus
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