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| scientific name | common name(s) | image gallery |
| Nuphar lutea | Yellow pond-lily Cow lily Spatter dock Yellow cow lily | |
| Nuphar lutea ssp. advena | Common spatterdock Yellow cow lily Yellow pond lily Spatterdock | |
| Nuttallanthus texanus | Texas Toad-Flax Texas toadflax Toadflax | |
| Oenothera macrocarpa | Bigfruit evening-primrose Missouri evening-primrose Fluttermill Big-fruit evening-primrose Missouri Primrose | |
| Oenothera rhombipetala | Diamond petal primrose Four-Point Evening Primrose Fourpoint evening-primrose Greater four-point evening-primrose | |
| Oenothera speciosa | Pink evening primrose Showy evening primrose Mexican evening primrose Showy primrose Pink ladies Buttercups Pink buttercups | |
| Onoclea sensibilis | Sensitive fern Bead fern Sympathy fern | |
| Opuntia engelmannii var. engelmannii | Cactus apple Prickly pear | |
| Opuntia macrorhiza | Common prickly-pear Plains prickly pear Prickly Pear Twist-spine prickly-pear Twistspine pricklypear | |
| Oxalis stricta | Common yellow oxalis Yellow Wood-sorrel | |
| Parkinsonia aculeata | Retama Paloverde Mexican Palo Verde Jerusalem thorn Lluvia de Oro | |
| Palafoxia callosa | Small palafox Small palafoxia | |
| Paspalum floridanum | Florida paspalum | |
| Passiflora incarnata | Purple passionflower Purple passion vine Maypop Apricot vine | |
| Passiflora lutea | Yellow passion vine Yellow passion-flower Yellow passionflower | |
| Paspalum plicatulum | Brownseed paspalum Brownseed paspale | |
| Parthenocissus quinquefolia | Virginia creeper | |
| Palafoxia rosea | Rosy palafox Rose palafoxia | |
| Palafoxia sphacelata | Othake Sand palafoxia | |
| Panicum virgatum | Switchgrass Wand panic grass | |
| Penstemon cobaea | Wild foxglove Prairie penstemon Foxglove penstemon False foxglove Large-flowered beardtongue Large-flowered penstemon Prairie beardtongue Cobaea penstemon | |
| Penstemon fendleri | Fendler's penstemon Fendler penstemon Purple foxglove | |
| Penstemon guadalupensis | Guadalupe beardtongue White Penstemon | |
| Penstemon triflorus | Hill Country Penstemon Scarlet Penstemon Heller's beardtongue | |
| Physostegia angustifolia | False Dragon-head Narrowleaf false dragonhead | |
| Phacelia congesta | Blue curls Caterpillars Fiddleneck | |
| Phlox drummondii | Annual phlox Phlox Drummond phlox | |
| Phlox drummondii ssp. mcallisteri | McAllister's phlox Drummond phlox | |
| Phlox pilosa ssp. pilosa | Downy phlox Fragrant phlox Prairie Phlox | |
| Phlox roemeriana | Goldeneye phlox Golden-eye Phlox | |
| Physostegia virginiana ssp. praemorsa | Fall obedient plant False dragonhead Lionheart Obedient plant | |
| Platanus occidentalis | American sycamore Buttonwood Plane-tree Sycamore | |
| Polygala alba | White milkwort | |
| Poa arachnifera | Texas bluegrass Texas blue grass | |
| Populus deltoides | Eastern cottonwood Alamo Carolina poplar Necklace Poplar | |
| Populus deltoides ssp. monilifera | Plains cottonwood Great Plains cottonwood | |
| Prunus angustifolia | Chickasaw plum Sandhill plum | |
| Prosopis glandulosa | Honey mesquite | |
| Prunus gracilis | Oklahoma plum | |
| Proboscidea louisianica | Devil's claw Ram's horn Unicorn plant Proboscis flower | |
| Prunus mexicana | Mexican plum Bigtree plum | |
| Prunus munsoniana | Munson plum Wild goose plum | |
| Prunus rivularis | Creek plum Hog plum River plum | |
| Prunus virginiana | Chokecherry Common chokecherry Choke cherry | |
| Pteridium aquilinum var. pseudocaudatum | Bracken fern Bracken Western bracken fern Western bracken | |
| Ptelea trifoliata | Wafer ash Common hoptree Hop tree | |
| Quercus fusiformis | Escarpment live oak Plateau live oak Texas live oak Scrub live oak Hill country live oak Plateau oak | |
| Quercus macrocarpa | Bur oak Burr oak Savannah oak Overcup oak Prairie oak Mossy-cup oak Mossy-overcup oak Blue oak | |
| Quercus marilandica | Blackjack oak Barren oak Black oak Jack oak | |
| Quercus sinuata var. breviloba | White shin oak Bigelow oak Scaly-bark oak Limestone Durand oak Shortlobe oak Bastard oak | |
| scientific name | common name(s) | image gallery |