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3,375 species in Joshua Tree National Park
Psora californica
Psora peninsularis
Psora tuckermanii
Psorodendron fremontii
Psyllobora renifer
Pterocheilus hirsutipennis
Pterostichus isabellae
Puccinia cynodontis
Pulex irritans
Puto simmondsiae
Pycnanthemum californicum
Pyrausta laticlavia
Ragonotia dotalis
Ranunculus sceleratus
Rattus norvegicus
Reticulitermes hesperus
Rhaphiomidas acton
Rhinoplatia ruficollis
Rhipicephalus sanguineus
Rhizocarpon disporum
Rhizoplaca subdiscrepans
Rhizopus stolonifer
Rhopalomyia audibertiae
Rhopalomyia glutinosa
Rhus lanceolata
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