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| scientific name | common name(s) | image gallery |
| Rhynchospora colorata | Starrush whitetop Star sedge White-topped sedge Whitetop sedge | |
| Rhynchospora glomerata | Clustered beaksedge Cluster Beak-rush | |
| Rhus virens | Evergreen sumac Tobacco sumac | |
| Rivina humilis | Pigeonberry Rouge plant Baby peppers | |
| Rudbeckia hirta | Black-eyed Susan Common black-eyed Susan Brown-eyed Susan | |
| Rudbeckia maxima | Giant coneflower Great coneflower Giant Brown-eyed Susan | |
| Salvia azurea | Pitcher sage Big blue sage Azure sage Giant blue sage Blue sage | |
| Salvia azurea var. grandiflora | Pitcher sage Blue sage | |
| Saururus cernuus | Lizard's tail Lizard's-tail Breast weed | |
| Salvia farinacea | Mealy blue sage Mealy sage Mealycup sage | |
| Salvia lyrata | Lyreleaf sage Cancer weed | |
| Sabal mexicana | Mexican palm Palma Di Micharos Rio Grande palmetto Texas palm Texas palmetto | |
| Sabal minor | Dwarf palmetto Palmetto Bush palmetto | |
| Salvia pentstemonoides | Big red sage Penstemon sage | |
| Sapindus saponaria var. drummondii | Western soapberry Soapberry | |
| Schoenoplectus californicus | California bulrush California club-rush Giant Bulrush | |
| Scutellaria drummondii | Drummond's skullcap | |
| Schizachyrium scoparium | Little bluestem | |
| Schoenocaulon texanum | Green Lily Texas feathershank Texas Sabadilla | |
| Silphium albiflorum | White rosinweed White-flowered rosinweed Compass Plant | |
| Simsia calva | Awnless bush sunflower Bush sunflower | |
| Silphium laciniatum | Compassplant Compass plant | |
| Solidago altissima | Tall Goldenrod Late goldenrod Canadian goldenrod Canada goldenrod | |
| Solidago nemoralis | Gray goldenrod Prairie goldenrod Old field goldenrod | |
| Sorghastrum nutans | Indiangrass Yellow indian grass | |
| Sophora secundiflora | Texas mountain laurel Mountain laurel Mescal bean Mescal bean sophora Frijolillo Frijolito | |
| Styphnolobium affine | Eve’s necklace Eve's necklacepod Texas sophora | |
| Stachys coccinea | Scarlet betony Scarlet hedge-nettle Texas betony | |
| Stillingia texana | Texas Queen's Delight Queen's Delight Texas toothleaf | |
| Teucrium canadense var. canadense | Canada germander | |
| Tetraneuris scaposa | Four-nerve daisy Hymenoxys Stemmy four-nerve daisy Yellow daisy Bitterweed | |
| Tetraneuris scaposa var. scaposa | Four-nerve daisy Hymenoxys Stemmy four-nerve daisy Bitterweed | |
| Tillandsia recurvata | Small ball moss Ball moss | |
| Tridens albescens | White tridens White Top | |
| Tripsacum dactyloides | Eastern gamagrass | |
| Tradescantia edwardsiana | Plateau spiderwort Edward’s spiderwort | |
| Tridens flavus | Purpletop tridens Redtop tridens Tall redtop tridens Purpletop Redtop Tall redtop | |
| Tradescantia gigantea | Giant spiderwort | |
| Tridens muticus | Slim tridens | |
| Tradescantia occidentalis | Prairie spiderwort Western Spiderwort Spiderwort | |
| Ungnadia speciosa | Mexican buckeye | |
| Vernonia baldwinii | Baldwin's ironweed Western Ironweed Ironweed | |
| Verbena halei | Slender verbena Texas verbena Texas vervain | |
| Vernonia lindheimeri | Woolly ironweed | |
| Viguiera dentata | Sunflower goldeneye Plateau goldeneye Toothleaf goldeneye Goldeneye Chimalacate | |
| Viburnum rufidulum | Rusty blackhaw viburnum Rusty blackhaw Southern blackhaw Downy viburnum | |
| Wisteria frutescens | American wisteria Texas wisteria Kentucky wisteria | |
| Xanthium strumarium var. canadense | Canada cockleburr | |
| Yucca pallida | Pale-leaf yucca | |
| Yucca rupicola | Twistleaf yucca Twisted-leaf yucca Texas yucca | |
| scientific name | common name(s) | image gallery |