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4,118 species in Yellowstone National Park
Polytrichum strictum
Porpidia macrocarpa
Porterella carnosula
Potamogeton alpinus
Brickellia grandiflora
Potamogeton praelongus
Potamogeton pusillus
Potamogeton richardsonii
Potentilla argentea
Potentilla hookeriana
Aeshna juncea
Brodoa oroarctica
Danthonia californica
Potentilla pulcherrima
Protoparmeliopsis muralis
Protostropharia semiglobata
Pseudephebe minuscula
Pseudepipona aldrichi
Pseudepipona herrichii
Pterigynandrum filiforme
Pterostichus adstrictus
Ptychostomum turbinatum
Puccinia cnici-oleracei
Puccinia gigantea
Puccinia oenotherae
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