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5,133 species in Big Bend National Park
Peccania texana
Pectis cylindrica
Peganum harmala
Penstemon dasyphyllus
Pepsis thisbe
Perdita exclamans
Perdita stathamae
Pertusaria pseudocorallina
Petrophytum caespitosum
Phaeoura belua
Phaeoura cristifera
Phemeranthus confertiflorus
Phobolosia anfracta
Phoradendron villosum
Phrynus operculatus
Phyciodes phaon
Physalis solanacea
Physaria gordonii
Physaria mcvaughiana
Physcia aipolia
Physcia albinea
Pinus edulis
Poa bigelovii
Portulaca oleracea
Prolita dialis
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