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| scientific name | common name(s) | image gallery |
| Dichondra argentea | Silver Ponyfoot Silver ponysfoot | |
| Dicliptera brachiata | Branched Dicliptera Branched foldwing | |
| Dichondra carolinensis | Carolina ponysfoot Ponyfoot | |
| Dichanthelium oligosanthes var. oligosanthes | Heller's rosette grass | |
| Dichondra recurvata | Oakwoods ponysfoot Oakwoods Ponyfoot | |
| Diospyros texana | Texas persimmon Mexican persimmon Black persimmon Chapote Chapote prieto | |
| Draba cuneifolia | Wedgeleaf draba Whitlow-grass | |
| Draba platycarpa | Broadpod draba Broad-pod Draba Broadpod whitlowgrass | |
| Dyschoriste linearis | Snake herb Polkadots Narrowleaf dyschoriste | |
| Echinacea angustifolia | Black Sampson Black Samson echinacea Narrow-leaf Coneflower | |
| Echinodorus berteroi | Upright burrhead | |
| Echinodorus cordifolius | Creeping burrhead Lance-leaf Burhead Radican Sword "Giant Mother Plant" | |
| Echinocereus coccineus var. paucispinus | Scarlet hedgehog cactus Claret Cup | |
| Echinacea purpurea | Eastern purple coneflower Purple coneflower | |
| Echinocereus reichenbachii | Lace Cactus Lace hedgehog cactus Órgano-pequeño de colores Purple candle | |
| Echinocereus reichenbachii ssp. reichenbachii | Lace Cactus Lace hedgehog cactus | |
| Echinocactus texensis | Chisos Hedgehog Devil’s head Horse crippler | |
| Ehretia anacua | Anacua Sugarberry Anacua Anaqua Knockaway Sandpaper tree | |
| Elymus canadensis | Canada wild rye Canadian wildrye Prairie wildrye Nodding wildrye | |
| Eleocharis montevidensis | Sand spikerush | |
| Eleocharis quadrangulata | Squarestem spikerush | |
| Eleocharis rostellata | Beaked spikerush Leap Frog Spike Rush | |
| Elymus virginicus var. virginicus | Virginia Wild Rye Virginia wildrye | |
| Engelmannia peristenia | Engelmann's daisy Engelmann Daisy Cutleaf Daisy | |
| Ephedra antisyphilitica | Mormon tea Joint-fir Clapweed Popote | |
| Epipactis gigantea | Chatterbox Orchid Giant Hellebore Stream orchid | |
| Epithelantha micromeris | Pingpong ball cactus Button Cactus | |
| Equisetum hyemale var. affine | Scouringrush horsetail | |
| Equisetum laevigatum | Horsetail Smooth horsetail | |
| Eragrostis curtipedicellata | Gummy lovegrass Gummy Lovegrass | |
| Erythrina herbacea | Coralbean Cherokee bean Red cardinal | |
| Eragrostis intermedia | Plains lovegrass Plains Lovegrass | |
| Eryngium leavenworthii | Leavenworth's eryngo Eryngo | |
| Erigeron modestus | Plains fleabane Prairie fleabane | |
| Erioneuron pilosum | Hairy woollygrass Hairy tridens | |
| Eriochloa sericea | Texas cupgrass | |
| Eragrostis spectabilis | Purple lovegrass Purple love grass Purple plains lovegrass Tumblegrass Petticoat climber | |
| Erodium texanum | Fillaree Pine needle Stork’s Bill Texas stork's bill Texas stork’s bill | |
| Escobaria missouriensis | Missouri foxtail cactus Plains nipple cactus | |
| Euphorbia cyathophora | Wild Poinsettia Poinsettia Fire on the Mountain | |
| Euphorbia dentata | Toothed spurge Toothedleaf poinsettia | |
| Eustoma exaltatum | Catchfly prairie gentian Bluebell gentian Western blue gentian Blue marsh lily Small bluebell Catchfly gentian Seaside gentian | |
| Eustoma exaltatum ssp. russellianum | Texas bluebells Texas bluebell Bluebell Showy prairie gentian Prairie gentian | |
| Euphorbia marginata | Snow on the mountain Snow-on-the-mountain | |
| Eupatorium serotinum | Lateflowering thoroughwort White boneset Late boneset Late-flowering boneset | |
| Evax prolifera | Bighead pygmycudweed Rabbit Tobacco | |
| Evolvulus sericeus | Silver dwarf morning-glory White Evolvulus | |
| Eysenhardtia texana | Texas kidneywood Kidneywood Bee-Brush Vara dulce | |
| Forestiera pubescens | Stretchberry Elbow bush Spring herald | |
| Forestiera pubescens var. pubescens | Stretchberry Elbowbush Stretch-berry Downy forestiera Desert olive Elbow-bush | |
| Fraxinus albicans | Texas Ash | |
| Frangula caroliniana | Carolina buckthorn Carolina false buckthorn Indian cherry | |
| Fraxinus pennsylvanica | Green ash Red ash | |
| Fraxinus velutina | Arizona ash Desert ash Velvet ash | |
| Funastrum crispum | Wavy-leaf Milkweed Vine Wavyleaf twinevine | |
| Fuirena simplex | Umbrellagrass Western umbrella-sedge | |
| Gaillardia aestivalis var. winkleri | Winkler's blanketflower | |
| Galphimia angustifolia | Narrow-leaf Goldshower Narrowleaf goldshower Thryallis | |
| Galium aparine | Catchweed Bedstraw Cleavers Stickywilly | |
| Gaura lindheimeri | Lindheimer's beeblossom White gaura Butterfly gaura | |
| Gaura mollis | Lizard-tail Velvetweed Velvet-leaf Gaura Willow Gaura | |
| Garrya ovata ssp. lindheimeri | Lindheimer's silktassel Lindheimer Silk Tassel Lindheimer's Garrya | |
| Gaillardia pulchella | Firewheel Indian Blanket | |
| Gaillardia suavis | Perfumeballs Pincushion daisy Fragrant gaillardia Rayless gaillardia | |
| Galium texense | Texas bedstraw | |
| Galium virgatum | Southwest Bedstraw Southwestern bedstraw | |
| Geranium carolinianum | Carolina geranium Wild geranium | |
| Geum canadense | White avens | |
| Gelsemium sempervirens | Carolina jessamine Yellow jessamine Evening trumpetflower Poor man's rope | |
| Giliastrum incisum | Split-leaf gilia Cut-leaf Gilia | |
| Giliastrum rigidulum | Bluebowls Blue gilia | |
| Glandularia bipinnatifida var. bipinnatifida | Prairie verbena Purple prairie verbena Dakota mock vervain Dakota vervain | |
| Glandularia pumila | Pink mock vervain Low Verbena | |
| Grindelia lanceolata | Narrowleaf gumweed Fall gumweed | |
| Gutierrezia sarothrae | Broom snakeweed Kindlingweed Matchbrush Texas snakeweed Broomweed Turpentine weed | |
| Halesia carolina | Carolina silverbell | |
| Habranthus tubispathus | Copper lily Rio Grande copper-lily Rio Grande copperlily | |
| Hamamelis virginiana | Witch hazel American witch hazel | |
| Hedeoma acinoides | Slender false pennyroyal Annual pennyroyal Slender hedeoma | |
| Helenium amarum | Yellow Sneezeweed Bitterweed Yellow bitterweed Yellowdicks Slender-leaved sneezeweed Fine-leaved sneezweed Yellow dog-fennel | |
| Helenium amarum var. amarum | Yellowdicks Yellow Bitterweed | |
| Helianthus annuus | Common sunflower | |
| Heterotheca canescens | Gray golden-aster Hoary false goldenaster | |
| Hedeoma drummondii | Drummond's false pennyroyal Limoncillo Mock Pennyroyal | |
| Heteranthera dubia | Grassleaf mudplantain Water Stargrass | |
| Herbertia lahue | Prairie nymph Herbertia | |
| Herbertia lahue ssp. caerulea | Prairie nymph Herbertia | |
| Heteranthera limosa | Blue Mud Plantain Blue mudplantain | |
| Helianthus maximiliani | Maximilian sunflower Max sunflower | |
| Helietta parvifolia | Barreta | |
| Hesperaloe parviflora | Red yucca Coral yucca Red flowered false yucca Redflower false yucca Samandoque Yellow yucca | |
| Heterotheca subaxillaris | Camphorweed Camphor Weed | |
| Heliotropium tenellum | Pasture heliotrope White heliotrope | |
| Hilaria belangeri var. belangeri | Curly-mesquite | |
| Hibiscus laevis | Halberdleaf rosemallow Halberdleaf hibiscus Scarlet rose mallow | |
| Hibiscus lasiocarpos | Rose-mallow Rosemallow Woolly mallow Wooly Rose-mallow | |
| Hibiscus martianus | Heartleaf rosemallow Tulipan del Monte Heartleaf Hibiscus | |
| Hordeum pusillum | Little barley | |
| Houstonia pusilla | Tiny bluet Small Bluets Star violet | |
| Hymenopappus artemisiifolius | Old plainsman Oldplainsman Woolly-white | |
| scientific name | common name(s) | image gallery |