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2,243 species in Mammoth Cave National Park
Porcellio scaber
Proceratium silaceum
Procyon lotor
Psephenus herricki
Pseudoinonotus dryadeus
Pseudothyris sepulchralis
Ptomaphagus hirtus
Pycnanthemum incanum
Quercus coccinea
Quercus imbricaria
Quercus marilandica
Quercus palustris
Quercus stellata
Ranunculus micranthus
Ratibida pinnata
Rhodobaenus quinquepunctatus
Rhyacophila carpenteri
Rivula propinqualis
Rorippa sylvestris
Rumex crispus
Rumex obtusifolius
Sanicula odorata
Saperda imitans
Saperda tridentata
Sedum sarmentosum
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