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| scientific name | common name(s) | image gallery |
| Packera obovata | Golden groundsel Roundleaf groundsel Roundleaf ragwort Squawweed | |
| Panicum virgatum | Switchgrass Wand panic grass | |
| Phoradendron tomentosum | Christmas mistletoe Mistletoe Injerto | |
| Pistacia mexicana | Mexican pistachio Texas pistachio American pistachio | |
| Prunus mexicana | Mexican plum Bigtree plum | |
| 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 | |
| Quercus muehlenbergii | Chinkapin oak Chinquapin oak Chestnut oak Yellow chestnut oak Yellow oak Rock chestnut oak Rock oak | |
| Ratibida columnifera | Mexican hat Prairie coneflower Upright prairie coneflower Red-spike mexican-hat Long-headed coneflower Thimbleflower | |
| Rhus lanceolata | Prairie flameleaf sumac Flame-leaf sumac Prairie sumac Lance-leaf sumac | |
| Rhus virens | Evergreen sumac Tobacco sumac | |
| Salvia farinacea | Mealy blue sage Mealy sage Mealycup sage | |
| Sapindus saponaria var. drummondii | Western soapberry Soapberry | |
| Schedonnardus paniculatus | Tumblegrass Tumble grass | |
| Schizachyrium scoparium | Little bluestem | |
| 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 | |
| Setaria scheelei | Southwestern bristlegrass Scheele's bristlegrass Foxtail grass Scheele's foxtail grass | |
| Sideroxylon lanuginosum | Gum bumelia Gum bully Woollybucket bumelia Chittamwood Gum elastic Coma | |
| Smilax bona-nox | Saw greenbrier Catbrier Bullbrier | |
| Sorghastrum nutans | Indiangrass Yellow indian grass | |
| Solanum rostratum | Buffalobur nightshade Buffalo bur | |
| Sophora secundiflora | Texas mountain laurel Mountain laurel Mescal bean Mescal bean sophora Frijolillo Frijolito | |
| Sporobolus compositus var. drummondii | Drummond's dropseed Head-like dropseed Meadow dropseed | |
| scientific name | common name(s) | image gallery |