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3,863 species in Mount Rainier National Park
Polystichum lemmonii
Polytrichum longisetum
Populus balsamifera
Porodaedalea gilbertsonii
Potamogeton gramineus
Potentilla ovina
Potentilla pulcherrima
Prepops bivittatus
Pristiloma lansingi
Pristiphora bivittata
Prophysaon foliolatum
Prophysaon humile
Prothalpia holmbergi
Protoparmelia badia
Protoparmelia ochrococca
Psathyrella abieticola
Psathyrella alluviana
Psathyrella caput-medusae
Psathyrella fulvescens
Psathyrella hirta
Psathyrella hymenocephala
Psathyrella longipes
Psathyrella orbitarum
Psathyrella septentrionalis
Psathyrella tenera
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