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| scientific name | common name(s) | image gallery |
| Pluchea camphorata | Camphor pluchea Camphor weed | |
| Platanus occidentalis | American sycamore Buttonwood Plane-tree Sycamore | |
| Populus deltoides | Eastern cottonwood Alamo Carolina poplar Necklace Poplar | |
| Polygonum hydropiperoides | Swamp smartweed | |
| Potamogeton illinoensis | Illinois pondweed | |
| Polygonum punctatum | Dotted smartweed | |
| Potamogeton pusillus | Small pondweed | |
| Prosopis glandulosa | Honey mesquite | |
| Ptelea trifoliata | Wafer ash Common hoptree Hop tree | |
| Quercus buckleyi | Texas red oak Buckley oak Spanish oak Spotted Oak Rock Oak | |
| Quercus fusiformis | Escarpment live oak Plateau live oak Texas live oak Scrub live oak Hill country live oak Plateau oak | |
| Ratibida columnifera | Mexican hat Prairie coneflower Upright prairie coneflower Red-spike mexican-hat Long-headed coneflower Thimbleflower | |
| Rhynchospora colorata | Starrush whitetop Star sedge White-topped sedge Whitetop sedge | |
| Rhynchospora nivea | Showy whitetop | |
| Rhus virens | Evergreen sumac Tobacco sumac | |
| Ruellia nudiflora | Violet ruellia Common wild petunia Violet wild petunia Wild petunia | |
| Rubus riograndis | Rio Grande dewberry | |
| Saururus cernuus | Lizard's tail Lizard's-tail Breast weed | |
| Salvia farinacea | Mealy blue sage Mealy sage Mealycup sage | |
| Salix nigra | Black willow Gulf black willow | |
| Sagittaria platyphylla | Delta arrowhead | |
| Salvia roemeriana | Cedar sage | |
| Sapindus saponaria | Wingleaf soapberry Soapberry Wild China tree | |
| Schoenoplectus californicus | California bulrush California club-rush Giant Bulrush | |
| Senna lindheimeriana | Lindheimer's senna Velvet leaf senna Velvetleaf senna Velvet-leaf wild sensitive-plant Puppy-dog ears | |
| Setaria parviflora | Marsh bristlegrass Knotroot bristlegrass | |
| Senna roemeriana | Twoleaf senna Two leaved senna | |
| Silphium integrifolium | Wholeleaf rosinweed Entire-leaf rosinweed | |
| Smilax bona-nox | Saw greenbrier Catbrier Bullbrier | |
| Solidago altissima | Tall Goldenrod Late goldenrod Canadian goldenrod Canada goldenrod | |
| Solanum elaeagnifolium | Silverleaf nightshade Silver-leaf nightshade White horse nettle Trompillo Tomato weed | |
| Sorghastrum nutans | Indiangrass Yellow indian grass | |
| Styphnolobium affine | Eve’s necklace Eve's necklacepod Texas sophora | |
| Styrax platanifolius ssp. stellatus | Hairy sycamore-leaf snow-bell Sycamoreleaf snowbell | |
| Taxodium distichum | Bald cypress Baldcypress Common bald cypress Southern bald cypress Deciduous cypress | |
| Teucrium canadense | Canada germander American germander Canadian germander Germander Hairy germander Wood sage | |
| Thymophylla pentachaeta var. pentachaeta | Dogweed Dyssodia Fiveneedle pricklyleaf | |
| Tillandsia recurvata | Small ball moss Ball moss | |
| Toxicodendron radicans | Eastern poison ivy Poison ivy Poison oak | |
| Tripsacum dactyloides | Eastern gamagrass | |
| Tridens muticus | Slim tridens | |
| Typha domingensis | Southern cattail | |
| Ulmus americana | American elm White elm | |
| Ulmus crassifolia | Cedar elm Fall elm Olmo | |
| Ungnadia speciosa | Mexican buckeye | |
| Utricularia gibba | Bladderwort Conespur bladderpod Humped bladderwort | |
| Verbena canescens | Gray vervain | |
| Verbesina virginica | Frostweed White crownbeard Iceplant Iceweed Virginia crownbeard Indian tobacco Richweed Squawweed | |
| Viguiera dentata | Sunflower goldeneye Plateau goldeneye Toothleaf goldeneye Goldeneye Chimalacate | |
| Vitis monticola | Sweet mountain grape Champin Grape | |
| scientific name | common name(s) | image gallery |