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| scientific name | common name(s) | image gallery |
| Desmanthus illinoensis | Illinois bundleflower Bundleflower Prairie bundle flower Prickleweed Illinois Desmanthus Prairie mimosa | |
| Dichondra argentea | Silver Ponyfoot Silver ponysfoot | |
| Digitaria californica | Arizona cottontop California cottontop California crab grass Cottontop | |
| Diospyros texana | Texas persimmon Mexican persimmon Black persimmon Chapote Chapote prieto | |
| Echinacea angustifolia | Black Sampson Black Samson echinacea Narrow-leaf Coneflower | |
| Elymus canadensis | Canada wild rye Canadian wildrye Prairie wildrye Nodding wildrye | |
| Elymus elymoides ssp. brevifolius | Squirreltail Long-leaf squirrel-tail | |
| Ephedra antisyphilitica | Mormon tea Joint-fir Clapweed Popote | |
| Epipactis gigantea | Chatterbox Orchid Giant Hellebore Stream orchid | |
| Equisetum hyemale var. affine | Scouringrush horsetail | |
| Eriogonum annuum | Annual buckwheat Wild Buckwheat | |
| Eragrostis intermedia | Plains lovegrass Plains Lovegrass | |
| Eryngium leavenworthii | Leavenworth's eryngo Eryngo | |
| Eriogonum multiflorum | Wild buckwheat Heartsepal buckwheat Heart-sepal wild buckwheat | |
| Erioneuron pilosum | Hairy woollygrass Hairy tridens | |
| Eriochloa sericea | Texas cupgrass | |
| Euphorbia antisyphilitica | Candelilla Wax plant | |
| Eucnide bartonioides | Rock-nettle Yellow rocknettle Yellow stingbush | |
| Euphorbia cyathophora | Wild Poinsettia Poinsettia Fire on the Mountain | |
| Euphorbia marginata | Snow on the mountain Snow-on-the-mountain | |
| Eysenhardtia texana | Texas kidneywood Kidneywood Bee-Brush Vara dulce | |
| Fallugia paradoxa | Apache plume Ponil | |
| Forestiera pubescens var. pubescens | Stretchberry Elbowbush Stretch-berry Downy forestiera Desert olive Elbow-bush | |
| Fouquieria splendens | Ocotillo Devil’s walking stick Candlewood | |
| Fraxinus americana | White ash | |
| Fraxinus berlandieriana | Mexican ash Fresno Berlandier ash | |
| Fraxinus greggii | Gregg's ash Littleleaf ash Escobilla | |
| Fraxinus texensis | Texas ash | |
| Funastrum cynanchoides | Fringed twinevine Climbing milkweed vine Twine-vine | |
| Funastrum cynanchoides ssp. heterophyllum | Hartweg's twinevine Vine milkweed | |
| Gaillardia pulchella | Firewheel Indian Blanket | |
| Gaillardia suavis | Perfumeballs Pincushion daisy Fragrant gaillardia Rayless gaillardia | |
| Geum canadense | White avens | |
| Glandularia bipinnatifida var. bipinnatifida | Prairie verbena Purple prairie verbena Dakota mock vervain Dakota vervain | |
| Glandularia canadensis | Rose vervain Sweet william Rose mock vervain | |
| Gleditsia triacanthos | Honey locust Common Honey-locust Honey-locust Thornless common honey-locust Honey shucks | |
| Guajacum angustifolium | Texas lignum-vitae Guayacan Soapbush | |
| Gutierrezia sarothrae | Broom snakeweed Kindlingweed Matchbrush Texas snakeweed Broomweed Turpentine weed | |
| Hamamelis virginiana | Witch hazel American witch hazel | |
| Helenium amarum | Yellow Sneezeweed Bitterweed Yellow bitterweed Yellowdicks Slender-leaved sneezeweed Fine-leaved sneezweed Yellow dog-fennel | |
| Heteropogon contortus | Tanglehead | |
| Heliotropium curassavicum | Salt heliotrope Seaside heliotrope Quail plant Cola de mico | |
| Helianthus maximiliani | Maximilian sunflower Max sunflower | |
| Hesperaloe parviflora | Red yucca Coral yucca Red flowered false yucca Redflower false yucca Samandoque Yellow yucca | |
| Helianthus petiolaris | Prairie sunflower Plains sunflower | |
| Heliotropium tenellum | Pasture heliotrope White heliotrope | |
| Hilaria belangeri var. belangeri | Curly-mesquite | |
| Hibiscus laevis | Halberdleaf rosemallow Halberdleaf hibiscus Scarlet rose mallow | |
| Hymenocallis liriosme | Spider Lily Spring Spider Lily Spring spiderlily | |
| Ibervillea lindheimeri | Lindheimer's globeberry Balsam gourd Globe berry Snake apple | |
| scientific name | common name(s) | image gallery |