Special Collections
Cross Timbers
This EPA Level III ecoregion encompasses all or part of 35 Texas counties. With most of this ecoregion occurring in a swath from central Texas north, its northern reaches extend into southeastern Oklahoma. In Texas, this ecoregion covers approximately the same land area as the Texas Parks & Wildlife Department’s Cross Timbers and Prairies vegetative region. This collection lists only those taxa found in the Texas portion of the Cross Timbers ecoregion.Printer Friendly: Species List | List with Images | List with QR Tags to Mobile
| scientific name | common name(s) | image gallery |
| Oenothera xerogaura | Drummond's Beeblossom Drummond's Gaura | |
| Oligoneuron nitidum | Shiny Goldenrod | |
| Oligoneuron rigidum | Stiff Goldenrod Hard-leaf Goldenrod | |
| Oligoneuron rigidum var. rigidum | Stiff Goldenrod | |
| Onosmodium bejariense | Soft-hair Marbleseed | |
| Onosmodium bejariense var. bejariense | Soft-hair Marbleseed False Gromwell | |
| Onosmodium bejariense var. occidentale | Western Marbleseed | |
| Onosmodium helleri | Heller's Marbleseed Marble-seed | |
| Onoclea sensibilis | Sensitive Fern Bead Fern Sympathy Fern | |
| Ophioglossum crotalophoroides | Bulbous Adder's-tongue | |
| Ophioglossum crotalophoroides var. crotalophoroides | Bulbous Adder's-tongue | |
| Ophioglossum engelmannii | Limestone Adder's-tongue Limestone Adderstongue | |
| Opuntia engelmannii | Cactus Apple Prickly Pear | |
| Opuntia engelmannii var. lindheimeri | Texas Prickly Pear Lindheimer's Prickly Pear Lindheimer Prickly Pear | |
| Oplismenus hirtellus | Basketgrass | |
| Oplismenus hirtellus ssp. setarius | Basketgrass | |
| Opuntia humifusa | Low Prickly Pear Smooth Prickly Pear Devil's Tongue | |
| Opuntia macrorhiza | Bigroot Prickly Pear Twist-spine Prickly Pear Common Prickly Pear Plains Prickly Pear | |
| Opuntia phaeacantha | Tulip Prickly Pear Brownspine Prickly Pear Cactus Purple-fruited Prickly Pear Brown-spined Prickly Pear New Mexico Prickly Pear Desert Prickly Pear | |
| Ophioglossum vulgatum | Southern Adder's-tongue Adder's-tongue Adder's-tongue Fern | |
| Orobanche ludoviciana | Louisiana Broomrape | |
| Orobanche ludoviciana ssp. multiflora | Manyflower Broomrape | |
| Osmorhiza longistylis | Longstyle Sweetroot Aniseroot Sweet-cicely Wild Licorice | |
| Ostrya virginiana | Eastern Hop-hornbeam American Hop-hornbeam Woolly Hop-hornbean Eastern Ironwood Roughbark Ironwood Ironwood Deerwood Leverwood | |
| Oxalis albicans | Radishroot Woodsorrel | |
| Oxalis dillenii | Slender Yellow Wood Sorrel Yellow Wood Sorrel Yellow Woodsorrel | |
| Oxalis drummondii | Drummond's Wood-sorrel Large-leaf Wood-sorrel Drummond's Woodsorrel | |
| Oxytropis lambertii | Purple Locoweed | |
| Oxalis stricta | Common Yellow Oxalis Yellow Wood-sorrel Upright Yellow Wood-sorrel Yellow Woodsorrel | |
| Oxalis violacea | Violet Woodsorrel Violet Wood-sorrel | |
| Parkinsonia aculeata | Retama Paloverde Mexican Paloverde Jerusalem Thorn Horsebean Lluvia De Oro | |
| Passiflora affinis | Bracted Passionflower Passion Flower | |
| Panicum anceps | Beaked Panicgrass Beaked Panic Grass | |
| Pappophorum bicolor | Pink Pappasgrass Pink Pappusgrass | |
| Palafoxia callosa | Small Palafox Small Palafoxia | |
| Panicum capillare | Witchgrass | |
| Parthenium confertum | Gray's Feverfew | |
| Panicum dichotomiflorum | Fall Panicgrass Fall Panic Grass | |
| Paspalum distichum | Knotgrass | |
| Panicum diffusum | Spreading Witchgrass West Indian Panicgrass West Indian Panic Grass | |
| Paspalum floridanum | Florida Paspalum | |
| Paspalidium geminatum | Egyptian Panicgrass | |
| Packera glabella | Butterweed Cress-leaf Groundsel Yellowtop | |
| Panicum hallii | Hall's Panicgrass Hall's Panic Grass | |
| Parthenocissus heptaphylla | Sevenleaf Creeper Seven-leaf Creeper | |
| Passiflora incarnata | Maypop Purple Passionflower Purple Passion Vine Apricot Vine | |
| Paronychia jamesii | James' Nailwort | |
| Paspalum langei | Rustyseed Paspalum | |
| Pavonia lasiopetala | Rock Rose Rose Pavonia Rose Mallow Pavonia | |
| Paronychia lindheimeri | Forked Nailwort | |
| Passiflora lutea | Yellow Passionflower Yellow Passion Vine Yellow Passion-flower | |
| Panicum obtusum | Vine Mesquite | |
| Packera obovata | Golden Groundsel Roundleaf Groundsel Roundleaf Ragwort | |
| Parietaria pensylvanica | Pennsylvania Pellitory Pennsylvania Cucumber Plant | |
| Panicum philadelphicum | Philadelphia Panicgrass Philadelphia Panic Grass | |
| Packera plattensis | Prairie Groundsel Prairie Ragwort | |
| Paspalum plicatulum | Brownseed Paspalum Brownseed Paspale | |
| Paspalum pubiflorum | Hairyseed Paspalum | |
| Parthenocissus quinquefolia | Virginia Creeper | |
| Panicum rigidulum | Redtop Panicgrass Redtop Panic Grass | |
| Palafoxia rosea | Rosy Palafox Rose Palafoxia | |
| Palafoxia rosea var. macrolepis | Rosy Palafox | |
| Pascopyrum smithii | Western Wheatgrass | |
| Palafoxia sphacelata | Othake Sand Palafoxia | |
| Packera tampicana | Yellowtop Great Plains Ragwort Butterweed | |
| Passiflora tenuiloba | Birdwing Passionflower Slender-lobe Passionflower Spread Lobe Passionflower Bird Wing Passionflower | |
| Panicum virgatum | Switchgrass Wand Panic Grass | |
| Paronychia virginica | Whitlow-wort Broom Nailwort Yellow Nailwort Park's Nailwort | |
| Parthenocissus vitacea | Woodbine Hiedra Creeper | |
| Panicum virgatum var. virgatum | Switchgrass | |
| Penstemon albidus | White Penstemon White Beardtongue Red-line Penstemon Red-line Beardtongue | |
| Pectis angustifolia | Limoncillo Lemonscent Crownseed Pectis Lemon-scented Pectis Lemonscent Pectis Lemonweed Chinchweed Fetid Marigold | |
| Pectis angustifolia var. fastigiata | Lemonscent | |
| Pellaea atropurpurea | Purple Cliffbrake | |
| Penstemon cobaea | Prairie Penstemon Prairie Beardtongue Foxglove Penstemon Foxglove Beardtongue False Foxglove Large-flowered Penstemon Large-flowered Beardtongue Cobaea Penstemon Cobaea Beardtongue Wild Foxglove | |
| Pediomelum cuspidatum | Indian-turnip Largebract Indian Breadroot Tall Scurfy Pea Tall-bread Scurf-pea | |
| Pediomelum cyphocalyx | Turniproot Wand Psoralea Turnip-root Scurf-pea | |
| Penstemon digitalis | Mississippi Penstemon Mississippi Beardtongue Smooth White Penstemon Smooth White Beardtongue Talus Slope Penstemon Talus Slope Beardtongue Foxglove Penstemon Foxglove Beardtongue | |
| Pediomelum digitatum | Palmleaf Indian Breadroot Palm-leaf Scurf-pea | |
| Penstemon fendleri | Fendler's Penstemon Fendler's Beardtongue Fendler Penstemon Fendler Beardtongue Purple Foxglove | |
| Penstemon grandiflorus | Large Penstemon Large Beardtongue Large-flower Penstemon Large-flower Beardtongue Large-flowered Penstemon Large-flowered Beardtongue | |
| Penstemon guadalupensis | Guadalupe Penstemon Guadalupe Beardtongue White Penstemon White Beardtongue | |
| Pediomelum hypogaeum | Subterranean Indian Breadroot Edible Scurf-pea Prairie-potato Pomme Blanche | |
| Pediomelum hypogaeum var. hypogaeum | Subterranean Indian Breadroot Indian Breadroot Edible Scurf-pea | |
| Pediomelum hypogaeum var. scaposum | Subterranean Indian Breadroot | |
| Pediomelum hypogaeum var. subulatum | Subterranean Indian Breadroot | |
| Penstemon laxiflorus | Nodding Penstemon Nodding Beardtongue Loose-flowered Penstemon Loose-flowered Beardtongue | |
| Pediomelum latestipulatum | Texas Plains Indian Breadroot Scurfpea Scurf-pea | |
| Pediomelum latestipulatum var. appressum | Texas Plains Indian Breadroot Scurfpea Scurf-pea | |
| Pediomelum latestipulatum var. latestipulatum | Texas Plains Indian Breadroot Scurfpea Scurf-pea | |
| Pediomelum linearifolium | Narrowleaf Indian Breadroot Narrow-leaf Scurf-pea | |
| Perityle lindheimeri | Lindheimer's Rockdaisy Rock Daisy | |
| Penstemon murrayanus | Scarlet Penstemon Scarlet Beardtongue Red Penstemon Red Beardtongue Cupleaf Penstemon Cupleaf Beardtongue | |
| Pellaea ovata | Ovateleaf Cliffbrake Ovate-leaf Cliffbrake | |
| Pediomelum rhombifolium | Gulf Indian Breadroot Brown-flowered Psoralea Round-leaf Scurf-pea | |
| Penthorum sedoides | Ditch Stonecrop | |
| Penstemon triflorus | Hill Country Penstemon Hill Country Beardtongue Scarlet Penstemon Scarlet Beardtongue Heller's Penstemon Heller's Beardtongue | |
| Penstemon triflorus ssp. integrifolius | Heller's Penstemon Heller's Beardtongue | |
| Penstemon triflorus ssp. triflorus | Heller's Penstemon Heller's Beardtongue | |
| Penstemon tubaeflorus | White Wand Penstemon White Wand Beardtongue | |
| scientific name | common name(s) | image gallery |
