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4,849 species in Grand Canyon National Park
Sphinx dollii
Spilonema revertens
Spiza americana
Sporobolus texanus
Stagmomantis californica
Stellaria longifolia
Stiria consuela
Streptanthus carinatus
Stuckenia pectinata
Suaeda suffrutescens
Symphyotrichum expansum
Sympistis major
Synchlora bistriaria
Syrphus opinator
Systasea zampa
Taraxacum erythrospermum
Temnothorax tricarinatus
Terellia occidentalis
Tetragnatha versicolor
Tetraneuris ivesiana
Thlaspi arvense
Tiquilia nuttallii
Tolype distincta
Trapeliopsis flexuosa
Trifolium hybridum
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