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4,927 species in Cuyahoga Valley National Park
Pastinaca sativa
Pelegrina galathea
Peniophora albobadia
Persicaria lapathifolia
Phidippus whitmani
Philadelphus coronarius
Philomycus carolinianus
Phlox stolonifera
Phymata pennsylvanica
Physcia adscendens
Plagiomnium cuspidatum
Plicatura crispa
Poa trivialis
Poanes viator
Pseudocolus fusiformis
Pseudognaphalium obtusifolium
Psyllobora vigintimaculata
Pycnanthemum virginianum
Ratibida columnifera
Ravinia querula
Resseliella liriodendri
Riccia fluitans
Rivula propinqualis
Rosa canina
Samolus parviflorus
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