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| scientific name | common name(s) | image gallery |
| Salvia pentstemonoides | Big red sage Penstemon sage | |
| Salvia roemeriana | Cedar sage | |
| Scutellaria ovata ssp. bracteata | Heartleaf skullcap Heart-leaf skullcap | |
| Senna lindheimeriana | Lindheimer's senna Velvet leaf senna Velvetleaf senna Velvet-leaf wild sensitive-plant Puppy-dog ears | |
| Solidago nemoralis | Gray goldenrod Prairie goldenrod Old field goldenrod | |
| Sorghastrum nutans | Indiangrass Yellow indian grass | |
| Sphaeralcea incana | Gray globemallow | |
| Stachys coccinea | Scarlet betony Scarlet hedge-nettle Texas betony | |
| Stemodia lanata | Woolly Stemodia Gray-woolly twintip | |
| Symphyotrichum oblongifolium | Aromatic aster Aromatic American aster Fall aster Wild blue aster | |
| scientific name | common name(s) | image gallery |