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1,328 species in Arches National Park
Scopula plantagenaria
Scotogramma harnardi
Scotogramma submarina
Scyphophorus acupunctatus
Senecio flaccidus
Sintoria cyanea
Sisymbrium altissimum
Solanum dulcamara
Sonia vovana
Sorex monticolus
Sphex ashmeadi
Spilogale gracilis
Sporobolus texanus
Squamarina lentigera
Stamnodes animata
Stamnodes tessellata
Staurothele elenkinii
Stenelmis occidentalis
Stenogonum salsuginosum
Stenolophus comma
Stenoporpia glaucomarginaria
Stictiella pulchella
Strymon melinus
Stylurus intricatus
Suaeda calceoliformis
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