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| scientific name | common name(s) | image gallery |
| Funastrum cynanchoides | Fringed twinevine Climbing milkweed vine Twine-vine | |
| Fuirena simplex | Umbrellagrass Western umbrella-sedge | |
| Fuirena squarrosa | Hairy umbrella-sedge | |
| Gaillardia multiceps | Onion blanketflower Gyp indian blanket | |
| 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 uniflorum | Oneflower bedstraw | |
| Galium virgatum | Southwest Bedstraw Southwestern bedstraw | |
| Geum canadense | White avens | |
| Giliastrum incisum | Split-leaf gilia Cut-leaf Gilia | |
| Glandularia bipinnatifida | Purple prairie verbena Prairie verbena Dacota vervain Dakota mock vervain Moradilla | |
| Gomphrena nitida | Pearly globe amaranth | |
| Gymnosperma glutinosum | Gumhead Tatalencho | |
| Haploesthes greggii var. texana | Texas false broomweed | |
| Habenaria repens | Water-spider Orchid Waterspider bog orchid | |
| Habranthus tubispathus | Copper lily Rio Grande copper-lily Rio Grande copperlily | |
| 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 | |
| Helianthus angustifolius | Swamp sunflower | |
| Helianthus annuus | Common sunflower | |
| Helianthus argophyllus | Silverleaf sunflower | |
| Heterotheca canescens | Gray golden-aster Hoary false goldenaster | |
| Helianthus ciliaris | Texas blueweed | |
| Helianthus debilis | Beach sunflower Cucumber-leaf sunflower Cucumberleaf sunflower | |
| Hedeoma drummondii | Drummond's false pennyroyal Limoncillo Mock Pennyroyal | |
| Helenium drummondii | Fringed sneezeweed | |
| Helianthemum georgianum | Georgia frostweed Rockrose Georgia sunrose | |
| Hechtia glomerata | Guapilla | |
| Hexalectris grandiflora | Largeflower crested coralroot Greenman’s hexalectris Giant coral-root Greenman’s cock’s-comb | |
| Herbertia lahue | Prairie nymph Herbertia | |
| Helianthus maximiliani | Maximilian sunflower Max sunflower | |
| Hexalectris nitida | Glass Mountain crested coralroot | |
| Heliotropium procumbens | Fourspike heliotrope | |
| Helianthus praecox ssp. runyonii | Runyon's sunflower | |
| Hedeoma reverchonii var. reverchonii | Reverchon's false pennyroyal Rock hedeoma | |
| Heterotheca subaxillaris | Camphorweed Camphor Weed | |
| Heliotropium tenellum | Pasture heliotrope White heliotrope | |
| Hechtia texensis | Texas false agave Guapilla | |
| Heliotropium torreyi | Slimleaf heliotrope | |
| Hibiscus lasiocarpos | Rose-mallow Rosemallow Woolly mallow Wooly Rose-mallow | |
| Hibiscus striatus ssp. lambertianus | Striped rosemallow | |
| Hordeum pusillum | Little barley | |
| Hypericum hypericoides | St. Andrew's Cross | |
| Hydrolea ovata | Blue Water Leaf Hairy Hydrolea Ovate false fiddleleaf | |
| Hymenopappus scabiosaeus | Carolina woollywhite Old Plainsman Woolly-White | |
| Ibervillea lindheimeri | Lindheimer's globeberry Balsam gourd Globe berry Snake apple | |
| Ibervillea tenuisecta | Cutleaf Globe Berry Slimlobe globeberry | |
| Ilex coriacea | Large gallberry Bay-gall bush Ink-berry holly | |
| Ilex vomitoria | Yaupon Yaupon holly Cassina | |
| Indigofera lindheimeriana | Lindheimer's indigo | |
| Ipomoea cordatotriloba | Tievine Purple bindweed | |
| Ipomoea cristulata | Transpecos morning-glory Scarlet Creeper | |
| Ipomoea imperati | Beach morning glory Beach morning-glory | |
| Ipomoea pes-caprae | Railroad vine Goat-foot morning glory Bayhops Beach morning glory | |
| Ipomopsis rubra | Standing cypress Texas plume Red Texas star Red gilia | |
| Isocoma pluriflora | Jimmyweed Southern goldenbush | |
| Iva angustifolia | Narrowleaf marshelder Narrow-leaf Sumpweed | |
| Jefea brevifolia | Shortleaf jefea | |
| Juniperus ashei | Ashe juniper Ashe's juniper Mountain cedar Blueberry juniper | |
| Juncus marginatus | Grassleaf rush Grass Leaf Rush | |
| Juniperus pinchotii | Pinchot's juniper Pinchot juniper Redberry juniper | |
| Juncus validus var. validus | Roundhead rush | |
| Karwinskia humboldtiana | Coyotillo Humboldt coyotillo | |
| Kosteletzkya virginica | Virginia saltmarsh mallow Virginia fen-rose Seashore mallow Salt Marsh-mallow | |
| Krameria lanceolata | Trailing krameria Ratany Crameria Prairie sandbur Trailing Ratany | |
| Kyllinga brevifolia | Shortleaf spikesedge | |
| Kyllinga odorata | Fragrant spikesedge | |
| Leptochloa dubia | Green sprangletop | |
| Lesquerella grandiflora | Bigflower bladderpod | |
| Leucaena retusa | Goldenball leadtree Littleleaf leadtree | |
| Lechea san-sabeana | San Saba pinweed | |
| Lepidium virginicum | Virginia peppergrass Virginia pepperweed Peppergrass Poor man's pepper | |
| Liatris acidota | Sharp blazing star | |
| Linum alatum | Winged flax | |
| Limnodea arkansana | Ozark grass Ozarkgrass | |
| Listera australis | Southern twayblade | |
| Limonium carolinianum | Carolina sealavender Sea lavender | |
| Liatris elegans | Blazing star Gay feather Pink-scale gayfeather Pinkscale blazing star | |
| Linum hudsonioides | Hudson Flax Texas flax Yellow Flax | |
| Liatris mucronata | Cusp gayfeather Gayfeather Blazing star Narrow-leaf gayfeather Texas gayfeather Cusp blazing star | |
| Linum pratense | Meadow flax | |
| Linum rigidum var. rigidum | Stiffstem flax | |
| Linum rupestre | Rock flax | |
| Lobelia appendiculata var. appendiculata | Pale lobelia | |
| Lobelia cardinalis | Cardinal flower | |
| Lobelia fenestralis | Fringeleaf lobelia | |
| Lobelia puberula | Downy lobelia | |
| Lupinus havardii | Big Bend bluebonnet Big Bend lupine Havard bluebonnet Chisos bluebonnet | |
| Ludwigia repens | Creeping primrose-willow Floating primrose-willow Water primrose | |
| Lupinus texensis | Texas bluebonnet Bluebonnet Texas lupine Buffalo clover Wolf-flower | |
| Lycium carolinianum var. quadrifidum | Carolina wolfberry Creeping wolfberry Carolina desert-thorn | |
| Lyonia mariana | Piedmont staggerbush Staggerbush | |
| Lycurus setosus | Bristly wolfstail | |
| Lygodesmia texana | Texas skeletonplant Texas skeleton weed Skeleton-plant Purple dandelion | |
| Maurandella antirrhiniflora | Roving sailor Snapdragon Vine Climbing snapdragon Little snapdragon vine | |
| Malvaviscus arboreus var. drummondii | Turk's cap or Turkscap Drummond's turkscap Wax mallow Drummond wax-mallow Red mallow Texas mallow Mexican apple Manzanilla Sleeping hibiscus Bleeding hearts | |
| Malvastrum aurantiacum | Wright's false mallow | |
| Malachra capitata | Malva de caballo | |
| Marshallia caespitosa | Barbara's-buttons Puffballs White Barbara’s-buttons | |
| scientific name | common name(s) | image gallery |