- Acanthaceae / Acanthus family
- Justicia americana — American waterwillow
- Ruellia humilis — low wild petunia
- Ruellia metziae — white wild petunia
- Ruellia nudiflora — wild petunia
- Agavaceae / Agave family
- Yucca constricta — buckley yucca
- Yucca rupicola — twistedleaf yucca
- Anacardiaceae / Sumac family
- Rhus aromatica — fragrant sumac
- Rhus lanceolata — prairie sumac
- Rhus virens — evergreen sumac
- Toxicodendron radicans — poison ivy
- Anemiaceae / Flowering Fern family
- Anemia mexicana — Mexican fern
- Apiaceae / Carrot family
- Chaerophyllum tainturieri — chervil
- Daucus pusillus — rattlesnake weed
- Spermolepis inermis — Red River scaleseed
- Torilis arvensis — Canada hedgeparsley
- Torilis nodosa — knotted hedgeparsley
- Apocynaceae / Dogbane family
- Amsonia ciliata — Texas slimpod
- Aquifoliaceae / Holly family
- Ilex decidua — possumhaw
- Aristolochiaceae / Birthwort family
- Aristolochia serpentaria — Virginia dutchmanspipe
- Asclepiadaceae / Milkweed family
- Asclepias asperula — antelopehorn milkweed
- Asclepias oenotheroides — zizotes milkweed
- Asclepias viridiflora — green antelopehorn milkweed
- Asclepias viridis — green antelopehorn
- Funastrum crispum — wavyleaf twinevine
- Matelea biflora — twoflower milkvine
- Matelea reticulata — netted milkvine
- Asteraceae / Sunflower family
- Ageratina havanensis — shrubby boneset
- Ambrosia psilostachya — western ragweed
- Amphiachyris dracunculoides — common broomweed
- Baccharis neglecta — Rooseveltweed
- Brickellia cylindracea — gravelbar brickellbush
- Calyptocarpus vialis — straggler daisy
- Carduus tenuiflorus — winged plumeless thistle
- Centaurea melitensis — Maltese star thistle
- Chaetopappa asteroides — least daisy
- Chaptalia carduacea — nodding silverpuff
- Chrysactinia mexicana — damianita
- Cirsium horridulum — bull thistle
- Cirsium texanum — Texas thistle
- Cirsium vulgare — bull thistle
- Conyza canadensis — marestail
- Dysodiopsis tagetoides — marygold dogweed
- Eclipta alba — yerba de tajo
- Engelmannia peristenia — Engelmann's daisy
- Erigeron modestus — plains fleabane
- Erigeron philadelphicus — Philadelphia fleabane
- Eupatorium serotinum — late eupatorium
- Evax prolifera — rabbit's tobacco
- Evax verna — spring pygmycudweed
- Gaillardia pulchella — rosering gaillardia
- Gaillardia suavis — sweet gaillardia
- Grindelia nuda var. nuda — curlytop gumweed
- Gymnosperma glutinosum — tatalencho
- Helenium amarum — bitter sneezeweed
- Helenium elegans — pretty sneezeweed
- Helianthus annuus — annual sunflower
- Helianthus maximiliani — Maximilian sunflower
- Heterotheca canescens — gray goldaster
- Heterotheca latifolia — camphorweed
- Hymenopappus scabiosaeus — flattop woollywhite
- Iva angustifolia — narrowleaf sumpweed
- Lactuca ludoviciana — Louisiana lettuce
- Liatris mucronata — narrowleaf gayfeather
- Liatris punctata — dotted gayfeather
- Lindheimera texana — Texas star
- Lygodesmia texana — Texas skeletonplant
- Marshallia caespitosa — seep marshallia
- Melampodium leucanthum — plains blackfoot
- Palafoxia callosa — small palafoxia
- Parthenium hysterophorus — whitetop weed
- Pinaropappus roseus — white rocklettuce
- Pluchea camphorata — camphor weed
- Pluchea odorata — sweetscent
- Pyrrhopappus multicaulis — manystemmed false-dandelion
- Ratibida columnifera — upright prairie coneflower
- Rudbeckia hirta — blackeyed Susan
- Simsia calva — awnless bushsunflower
- Solidago canadensis — Canada goldenrod
- Solidago nemoralis — dyersweed goldenrod
- Sonchus asper — prickly sowthistle
- Symphyotrichum drummondii — Drummond's aster
- Symphyotrichum ericoides — white heath aster
- Symphyotrichum subulatum — eastern annual saltmarsh aster
- Taraxacum officinale — dandelion
- Tetragonotheca texana — squarebud daisy
- Tetraneuris scaposa — slender-stem bitterweed
- Thelesperma filifolium — plains greenthread
- Thelesperma simplicifolium — slender greenthread
- Thymophylla pentachaeta — parralena, Tiny Tim
- Verbesina virginica — iceweed
- Vernonia lindheimeri — woolly ironweed
- Viguiera dentata — sunflower goldeneye
- Wedelia hispida — hairy wedelia
- Xanthium strumarium — cocklebur
- Berberidaceae / Barberry family
- Berberis swaseyi — Texas barberry
- Berberis trifoliolata — agarito
- Boraginaceae / Borage family
- Heliotropium indicum — India heliotrope
- Heliotropium tenellum — pasture heliotrope
- Lithospermum incisum — narrowleaf gromwell
- Brassicaceae / Mustard family
- Draba cuneifolia — wedgeleaf draba
- Lesquerella recurvata — gaslight bladderpod
- Rorippa nasturtium-aquaticum — watercress
- Bromeliaceae / Bromeliad family
- Tillandsia recurvata — ballmoss
- Cactaceae / Cactus family
- Coryphantha sulcata — grooved nipple cactus
- Echinocereus reichenbachii — lace hedgehog cactus
- Opuntia engelmannii var. lindheimeri — Texas pricklypear
- Opuntia macrorhiza — grassland pricklypear
- Campanulaceae / Bellflower family
- Lobelia cardinalis — cardinal flower
- Triodanis perfoliata — clasping Venuslookingglass
- Capparaceae / Caper family
- Polanisia dodecandra — clammyweed
- Caprifoliaceae / Honeysuckle family
- Lonicera albiflora — white honeysuckle
- Viburnum rufidulum — rusty blackhaw
- Caryophyllaceae / Pink family
- Arenaria benthamii — hilly sandwort
- Paronychia lindheimeri — forked nailwort
- Stellaria media — chickweed
- Chenopodiaceae / Goosefoot family
- Chenopodium album — lambsquarters
- Convolvulaceae / Morning-glory family
- Convolvulus equitans — gray bindweed
- Dichondra carolinensis — grass ponyfoot
- Evolvulus nuttallianus — shaggy dwarf morningglory
- Evolvulus sericeus — silky evolvulus
- Ipomoea cordatotriloba var. torreyana — Torrey's tievine
- Cornaceae / Dogwood family
- Cornus drummondii — roughleaf dogwood
- Cucurbitaceae / Gourd family
- Cucurbita foetidissima — buffalo gourd
- Cupressaceae / Cypress family
- Juniperus ashei — Ashe juniper
- Cyperaceae / Sedge family
- Carex microdonta — littletooth sedge
- Carex planostachys — cedar sedge
- Cladium mariscus ssp. jamaicense — Jamaica sawgrass
- Cyperus odoratus — fragrant flatsedge
- Eleocharis acutisquamata — sharpscale spikerush
- Eleocharis geniculata — tufted spikesedge
- Fuirena simplex — western umbrellasedge
- Rhynchospora colorata — starrush whitetop
- Rhynchospora nivea — showy whitetop
- Ebenaceae / Ebony family
- Diospyros texana — Texas persimmon
- Ericaceae / Heath family
- Arbutus xalapensis — Texas madrone
- Euphorbiaceae / Spurge family
- Acalypha ostryifolia — hophornbeam copperleaf
- Acalypha phleoides — shrubby copperleaf
- Chamaesyce albomarginata — whitemargin euphorbia
- Chamaesyce angusta — blackfoot sandmat
- Chamaesyce fendleri — Fendler's sandmat
- Chamaesyce nutans — nodding spurge
- Chamaesyce prostrata — prostrate spurge
- Croton monanthogynus — oneseeded croton
- Ditaxis humilis — low wildmercury
- Ditaxis simulans — plateau silverbush
- Euphorbia bicolor — snow-on-the-prairie
- Euphorbia cyathophora — fire on the mountain
- Euphorbia dentata — toothed euphorbia
- Phyllanthus polygonoides — knotweed leaflower
- Stillingia texana — Texas queensdelight
- Tragia brevispica — shortspike noseburn
- Tragia ramosa — catnip noseburn
- Fabaceae / Pea family
- Acacia farnesiana — huisache
- Acacia roemeriana — Roemer's acacia
- Astragalus nuttallianus — smallflowered milkvetch
- Cercis canadensis — eastern redbud
- Dalea frutescens — black dalea
- Desmanthus velutinus — velvet bundleflower
- Eysenhardtia texana — Texas kidneywood
- Indigofera miniata — western indigo
- Lespedeza texana — Texas lespedeza
- Lupinus texensis — Texas bluebonnet
- Medicago minima — little burclover
- Mimosa borealis — fragrant mimosa
- Mimosa roemeriana — Roemer sensitivebriar
- Mimosa texana — Texas mimosa
- Pediomelum hypogaeum — scurfpea
- Pediomelum latestipulatum — Texas Plains Indian breadroot
- Pediomelum linearifolium — slimleaf scurfpea
- Prosopis glandulosa — honey mesquite
- Rhynchosia senna — Texas snoutbean
- Senna roemeriana — twoleaf senna
- Sophora affinis — Texas sophora
- Sophora secundiflora — mescalbean
- Vicia ludoviciana — Louisiana vetch
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- Fagaceae / Beech family
- Quercus fusiformis — plateau oak
- Quercus sinuata var. breviloba — white shin oak
- Quercus texana — Spanish oak
- Fumariaceae / Fumitory family
- Corydalis aurea — scrambled eggs
- Gentianaceae / Gentian family
- Centaurium beyrichii — mountain pink
- Centaurium texense — Texas centaury
- Geraniaceae / Geranium family
- Erodium texanum — Texas filaree
- Geranium texanum — Texas geranium
- Hippocastanaceae / Buckeye family
- Aesculus pavia — red buckeye
- Aesculus pavia var. flavescens — red buckeye
- Hydrophyllaceae / Waterleaf family
- Nama jamaicense — Jamaicanweed
- Iridaceae / Iris family
- Nemastylis geminiflora — prairie pleatleaf
- Sisyrinchium dimorphum — wiry blueeyed grass
- Sisyrinchium ensigerum — swordleaf blue-eyed grass
- Juglandaceae / Walnut family
- Carya illinoinensis — pecan
- Juglans microcarpa — little walnut
- Juncaceae / Rush family
- Juncus filipendulus — ringseed rush
- Juncus interior — inland rush
- Juncus texanus — Texas rush
- Krameriaceae / Ratany family
- Krameria lanceolata — trailing ratany
- Lamiaceae / Mint family
- Hedeoma acinoides — slender hedeome
- Hedeoma drummondii — Drummond falsepennyroyal
- Hedeoma reverchoniivar. serpyllifolia — Reverchon's falsepennyroyal
- Lamium amplexicaule — henbit
- Monarda citriodora — lemon beebalm
- Physostegia angustifolia — narrowleaf dragonhead
- Salvia texana — Texas sage
- Scutellaria drummondii — Drummond's skullcap
- Scutellaria ovata — eggleaf skullcap
- Scutellaria wrightii — resinous skullcap
- Stachys crenata — mousesear
- Warnockia scutellarioides — prairie brazosmint
- Lentibulariaceae / Bladderwort family
- Utricularia gibba — conespur bladderpod
- Liliaceae / Lily family
- Allium canadense var. canadense — meadow garlic
- Allium drummondii — wild garlic
- Camassia scilloides — Atlantic camas
- Cooperia drummondii — Texas rainlilly
- Cooperia pedunculata — Cooper's rainlily
- Dasylirion texanum — Texas sotol
- Nolina lindheimeriana — Lindheimer nolina
- Nolina texana — sacahuista
- Nothoscordum bivalve — crowpoison
- Schoenocaulon texanum — Texas feathershank
- Zigadenus nuttallii — Nuttall deathcamas
- Linaceae / Flax family
- Linum rupestre — rock flax
- Loganiaceae / Logania family
- Mitreola petiolata — lax hornpod
- Spigelia hedyotidea — prairie pinkroot
- Lythraceae / Loosestrife family
- Lythrum ovalifolium — low loosestrife
- Malpighiaceae / Malpighia family
- Galphimia angustifolia — narrowleaf goldshower
- Malvaceae / Mallow family
- Abutilon fruticosum — Texas Indian mallow
- Callirhoe pedata — palmleaf poppymallow
- Sida abutifolia — spreading fanpetals
- Menispermaceae / Moonseed family
- Cocculus carolinus — Carolina snailseed
- Moraceae / Mulberry family
- Morus rubra — red mulberry
- Najadaceae / Waternymph family
- Najas guadalupensis — southern waternymph
- Nyctaginaceae / Four-o'clock family
- Boerhavia coccinea — scarlet spiderling
- Mirabilis linearis — narrowleaf four-o'clock
- Oleaceae / Olive family
- Forestiera pubescens — elbowbush
- Fraxinus pennsylvanica — green ash
- Fraxinus texensis — Texas ash
- Onagraceae / Evening-primrose family
- Calylophus berlandieri ssp. pinifolius — Berlandier's sundrops
- Ludwigia octovalvis — Mexican primrosewillow
- Ludwigia palustris — marsh seedbox
- Oenothera laciniata — cutleaf eveningprimrose
- Oenothera speciosa — showy eveningprimrose
- Oenothera triloba — stemless eveningprimrose
- Orchidaceae / Orchid family
- Epipactis gigantea — chatterbox orchid
- Hexalectris spicata var. arizonica — spiked crested coralroot
- Hexalectris spicata var. spicata — spiked crested coralroot
- Spiranthes magnicamporum — Great Plains ladiestresses
- Oxalidaceae / Wood sorrel family
- Oxalis dillenii — common yellow oxalis
- Oxalis drummondii — Drummond woodsorrel
- Papaveraceae / Poppy family
- Argemone albiflora — bluestem pricklypoppy
- Passifloraceae / Passion-flower family
- Passiflora lutea — passionflower
- Passiflora tenuiloba — birdwing passionflower
- Pedaliaceae / Sesame family
- Proboscidea louisianica — devil's claw
- Plantaginaceae / Plantain family
- Plantago helleri — Heller's plantain
- Plantago rhodosperma — redseed plantain
- Platanaceae / Plane-tree family
- Platanus occidentalis — American sycamore
- Polemoniaceae / Phlox family
- Gilia incisa — splitleaf gilia
- Gilia rigidula ssp. rigidula — bluebowls
- Polygalaceae / Milkwort family
- Polygala alba — white milkwort
- Polygala lindheimeri — shrubby milkwort
- Potamogetonaceae / Pondweed family
- Potamogeton illinoensis — Illinois pondweed
- Primulaceae / Primrose family
- Samolus valerandi ssp. parviflorus — water brookweed
- Pteridaceae / Maidenhair fern family
- Adiantum capillus-veneris — Venus hairfern
- Cheilanthes alabamensis — Alabama lipfern
- Cheilanthes tomentosa — woolly lipfern
- Ranunculaceae / Buttercup family
- Anemone heterophylla — wind-flower
- Clematis drummondii — old man's beard
- Delphinium carolinianum ssp. vimineum — Carolina larkspur
- Rhamnaceae / Buckthorn family
- Condalia hookeri — Brazilian bluewood
- Rhamnus (Frangula) caroliniana — Carolina buckthorn
- Rosaceae / Rose family
- Prunus serotina — black cherry
- Rubus trivialis — southern dewberry
- Rubiaceae / Madder family
- Cephalanthus occidentalis — common buttonbush
- Galium aparine — catchweed bedstraw
- Galium virgatum — southwest bedstraw
- Hedyotis nigricans — diamondflowers
- Rutaceae / Citrus family
- Thamnosma texana — desert rue
- Zanthoxylum hirsutum — prickly-ash
- Salicaceae / Willow family
- Salix nigra — black willow
- Sapindaceae / Soapberry family
- Sapindus saponaria var. drummondii — western soapberry
- Sapotaceae / Sapodilla family
- Sideroxylon lanuginosum ssp. albicans — gum bully
- Scrophulariaceae / Figwort family
- Agalinis edwardsiana — plateau false foxglove
- Bacopa monnieri — herb of grace
- Buchnera americana — American bluehearts
- Castilleja purpurea var. lindheimeri — Lindheimer's Indian paintbrush
- Leucospora multifida — narrowleaf paleseed
- Mecardonia vandellioides — yellow mecardonia
- Verbascum thapsus — flannel mullein
- Smilacaceae / Greenbriar family
- Smilax bona-nox — saw greenbrier
- Solanaceae / Potato family
- Bouchetia erecta — paintedtongue
- Chamaesaracha coniodes — gray false nightshade
- Datura inoxia — pricklyburr
- Nicotiana repanda — wild tobacco
- Physalis cinerascens var. cinerascens — smallflower groundcherry
- Solanum dimidiatum — Torrey nightshade
- Solanum elaeagnifolium — silverleaf nightshade
- Solanum rostratum — buffalobur
- Typhaceae / Cat-tail family
- Typha domingensis — southern cattail
- Ulmaceae / Elm family
- Celtis laevigata var. reticulata — netleaf hackberry
- Ulmus crassifolia — cedar elm
- Urticaceae / Nettle family
- Parietaria pensylvanica — Pennsylvania pellitory
- Verbenaceae / Vervain family
- Glandularia bipinnatifida — Dakota vervain
- Phyla nodiflora — sawtooth fogfruit
- Verbena canescens — gray vervain
- Verbena halei — slender verbena
- Viscaceae / Mistletoe family
- Phoradendron tomentosum — bigleaf mistletoe
- Vitaceae / Grape family
- Ampelopsis arborea — peppervine
- Cissus incisa — sorrelvine
- Parthenocissus heptaphylla — sevenleaf creeper
- Parthenocissus quinquefolia — Virginia creeper
- Vitis cinerea var. helleri — Heller's grape
- Vitis monticola — mountain grape
- Vitis mustangensis — mustang grape
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