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2,976 species in Lassen Volcanic National Park
Phyllotopsis nidulans
Phymatopus hectoides
Physarum auriscalpium
Physarum decipiens
Physarum rigidum
Piranga rubra
Pisidium idahoense
Pisolithus tinctorius
Pissodes terminalis
Pithya vulgaris
Placynthiella oligotropha
Plagiobothrys tenellus
Plagiomnium insigne
Planorbella binneyi
Planorbella subcrenata
Plantago erecta
Platanthera colemanii
Platyptilia carduidactylus
Platystoechotes lineata
Plectritis congesta
Plectritis macrocera
Pleopsidium flavum
Plestiodon skiltonianus
Plicaria endocarpoides
Plumatyla humerosa
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