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4,501 species in Indiana Dunes National Park
Senecio vulgaris
Sericomyia chrysotoxoides
Silene coronaria
Silene regia
Singerocybe adirondackensis
Sistotremastrum niveocremeum
Sisyrinchium albidum
Smilax herbacea
Smilia camelus
Solanum americanum
Solidago canadensis
Solidago gillmanii
Arilus cristatus
Solidago ohioensis
Carex hystericina
Arctium minus
Araneus marmoreus
Sphaerium simile
Sphaerophoria contigua
Sphagnum henryense
Sphagnum subtile
Carex interior
Spilosoma congrua
Spirodela polyrhiza
Sporobolus vaginiflorus
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