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4,118 species in Yellowstone National Park
Plataea trilinearia
Pluvialis squatarola
Poa arida
Poa leptocoma
Podagrostis humilis
Pontia beckerii
Potamogeton natans
Pristina aequiseta
Proserpinus flavofasciata
Prostoia besametsa
Protoblastenia rupestris
Protoparmeliopsis garovaglii
Protoptila erotica
Eriocoma nelsonii
Puccinellia distans
Puccinia apocrypta
Puccinia atrofusca
Pyrola picta
Ranunculus gmelinii
Ranunculus jovis
Reduvius personatus
Rhizocarpon riparium
Rhizoclonium hieroglyphicum
Rhizoplaca phaedrophthalma
Rumex venosus
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