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1,573 species in Crater Lake National Park
Ramaria formosa
Ramularia senecionis
Ranunculus populago
Ranunculus uncinatus
Recurvirostra americana
Rhadinoceraea aldrichi
Rhagium inquisitor
Rhinichthys klamathensis
Rhionaeschna multicolor
Rhizocarpon lecanorinum
Rhizopogon subcaerulescens
Rhopalomyia utahensis
Rhyssa persuasoria
Rorippa curvipes
Rosa woodsii
Rubus parviflorus
Rumex salicifolius
Russula brevipes
Salix barclayi
Salix geyeriana
Salix lasiandra
Salix lucida
Sanicula graveolens
Sanionia uncinata
Sarmentypnum exannulatum
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