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3,375 species in Joshua Tree National Park
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
Ribes cereum
Rumex salicifolius
Salix melanopsis
Salix scouleriana
Salix sessilifolia
Saltugilia australis
Salvia carduacea
Salvinia minima
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