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| scientific name | common name(s) | image gallery |
| 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 | |
| Pappophorum bicolor | Pink pappasgrass Pink pappusgrass | |
| Palafoxia callosa | Small palafox Small palafoxia | |
| Pavonia lasiopetala | Rock rose Rose pavonia Rose mallow Pavonia | |
| Passiflora lutea | Yellow passion vine Yellow passion-flower Yellow passionflower | |
| Parthenocissus quinquefolia | Virginia creeper | |
| Palafoxia rosea | Rosy palafox Rose palafoxia | |
| Palafoxia sphacelata | Othake Sand palafoxia | |
| Panicum virgatum | Switchgrass Wand panic grass | |
| Pectis angustifolia | Limoncillo Lemonscent Crownseed pectis Lemon-scented pectis Lemonscent pectis Lemonweed Chinchweed Fetid marigold | |
| Penstemon baccharifolius | Rock penstemon Cut-Leaf Penstemon Baccharis-leaf beardtongue Beard Tongue | |
| 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 | |
| Philadelphus texensis | Texas mock orange | |
| Pinus remota | Papershell pinyon Remote pinyon pine | |
| Platanus occidentalis | American sycamore Buttonwood Plane-tree Sycamore | |
| Polygala alba | White milkwort | |
| Poa arachnifera | Texas bluegrass Texas blue grass | |
| Pontederia cordata | Pickerelweed Pickerel Weed | |
| 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 | |
| Pteridium aquilinum var. pseudocaudatum | Bracken fern Bracken Western bracken fern Western bracken | |
| 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 | |
| Quercus grisea | Gray oak Mexican blue oak | |
| Quercus laceyi | Lacey oak Texas blue oak Canyon oak Smoky oak Rock oak | |
| Quincula lobata | Purple groundcherry Chinese lantern | |
| 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 pungens | Pungent oak Sandpaper oak Vasey oak | |
| Quercus sinuata var. breviloba | White shin oak Bigelow oak Scaly-bark oak Limestone Durand oak Shortlobe oak Bastard oak | |
| Quercus stellata | Post oak | |
| Quercus vaseyana | Vasey oak Sandpaper oak | |
| Ratibida columnifera | Mexican hat Prairie coneflower Upright prairie coneflower Red-spike mexican-hat Long-headed coneflower Thimbleflower | |
| scientific name | common name(s) | image gallery |