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4,849 species in Grand Canyon National Park
Pyrausta scurralis
Pyrgus xanthus
Pyrola aphylla
Pyrola elliptica
Quedius explanatus
Quercus havardii
Radula quadrata
Ramaria apiculata
Ramboldia elabens
Ramularia collo-cygni
Ranunculus alismifolius
Ranunculus andersonii
Ranunculus aquatilis
Ranunculus glaberrimus
Rasahus thoracicus
Ravenelia fragrans
Reduvius vanduzeei
Rena humilis
Rhagovelia distincta
Rhamnus crocea
Rhamnus serrata
Rhantus gutticollis
Rhantus sericans
Rhaponticum repens
Rhinocheilus lecontei
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