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4,501 species in Indiana Dunes National Park
Rhagoletis suavis
Rhodobryum roseum
Rhynchospora capitellata
Rhynchostegium serrulatum
Rumex britannica
Russula heterophylla
Russula luteobasis
Russula macropoda
Russula mariae
Russula ornaticeps
Salmo trutta
Salsola tragus
Salvelinus namaycush
Sanicula odorata
Sarcoporia longitubulata
Sayornis saya
Scirpus hattorianus
Scleria muehlenbergii
Scoliopteryx libatrix
Serpula himantioides
Silene csereii
Skeletocutis semipileata
Smilax ecirrhata
Smilax illinoensis
Solidago uliginosa
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