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| scientific name | common name(s) | image gallery |
| Houstonia humifusa | Matted bluet | |
| Hordeum pusillum | Little barley | |
| Houstonia pusilla | Tiny bluet Small Bluets Star violet | |
| Hymenopappus scabiosaeus | Carolina woollywhite Old Plainsman Woolly-White | |
| Hydrocotyle umbellata | Manyflower marshpennywort Water-pennywort Money-plant | |
| Indigofera miniata | Coastal indigo Scarlet Pea Texas Indigo Western indigo | |
| Ipomoea cordatotriloba | Tievine Purple bindweed | |
| Ipomoea lindheimeri | Lindheimer's morning-glory Blue Morning Glory | |
| Ipomopsis rubra | Standing cypress Texas plume Red Texas star Red gilia | |
| Justicia americana | American water-willow Water-willow | |
| Justicia pilosella | Gregg's tubetongue Hairy Tube-tongue False Honeysuckle | |
| Krameria lanceolata | Trailing krameria Ratany Crameria Prairie sandbur Trailing Ratany | |
| Lactuca canadensis | Canada lettuce Wild Lettuce | |
| Lesquerella argyraea | Silver bladderpod | |
| Lesquerella densiflora | Denseflower bladderpod Low bladderpod | |
| Lespedeza stuevei | Tall bush-clover Tall lespedeza | |
| Lepidium virginicum | Virginia peppergrass Virginia pepperweed Peppergrass Poor man's pepper | |
| Lithospermum incisum | Narrowleaf stoneseed Puccoon Fringed puccoon Narrowleaf gromwell Fringed gromwell Narrow-leaved puccoon | |
| Lithospermum matamorense | Rough stoneseed | |
| Liatris mucronata | Cusp gayfeather Gayfeather Blazing star Narrow-leaf gayfeather Texas gayfeather Cusp blazing star | |
| Linum rupestre | Rock flax | |
| Lonicera albiflora | Western white honeysuckle Texas honeysuckle White honeysuckle White shrub honeysuckle White limestone honeysuckle | |
| Lobelia cardinalis | Cardinal flower | |
| Lupinus subcarnosus | Sandyland bluebonnet Texas bluebonnet | |
| Lupinus texensis | Texas bluebonnet Bluebonnet Texas lupine Buffalo clover Wolf-flower | |
| Lygodesmia texana | Texas skeletonplant Texas skeleton weed Skeleton-plant Purple dandelion | |
| Matelea reticulata | Green milkweed vine Net vein milkvine Netted milkvine Pearl milkweed Vine | |
| Mahonia trifoliolata | Agarita Agarito Algerita Laredo mahonia Laredo Oregon-grape Trifoliate barberry | |
| Melilotus officinalis | Yellow sweetclover White Sweet Clover | |
| Mentzelia oligosperma | Chickenthief Stick-leaf | |
| Melothria pendula | Guadeloupe cucumber Meloncito Speckled Gourd | |
| Mimosa borealis | Fragrant mimosa Pink Mimosa | |
| Mirabilis linearis | Narrowleaf four o'clock | |
| Modiola caroliniana | Carolina bristlemallow Carolina Modiola | |
| Monarda citriodora | Lemon beebalm Horsemint Purple horsemint Lemon mint Plains horsemint Lemon horsemint | |
| Monarda clinopodioides | Basil beebalm | |
| Nama hispidum | Bristly nama Sand Bells Sand-bell | |
| Nothoscordum bivalve | Crow poison Crowpoison False garlic | |
| Nolina texana | Texas sacahuista Texas beargrass Basket grass Sacahuista Bunchgrass | |
| Nuttallanthus texanus | Texas Toad-Flax Texas toadflax Toadflax | |
| Oenothera laciniata | Cutleaf evening-primrose Cut-leaf Evening Primrose | |
| Oenothera speciosa | Pink evening primrose Showy evening primrose Mexican evening primrose Showy primrose Pink ladies Buttercups Pink buttercups | |
| Oenothera triloba | Stemless evening-primrose Stemless Evening Primrose | |
| Opuntia macrorhiza | Common prickly-pear Plains prickly pear Prickly Pear Twist-spine prickly-pear Twistspine pricklypear | |
| Oxalis dillenii | Slender yellow woodsorrel | |
| Oxalis drummondii | Drummond's woodsorrel Wood-sorrel | |
| Palafoxia callosa | Small palafox Small palafoxia | |
| Paronychia lindheimeri | Forked nailwort | |
| Phalaris caroliniana | Carolina canarygrass Maygrass | |
| Phacelia congesta | Blue curls Caterpillars Fiddleneck | |
| Phlox drummondii | Annual phlox Phlox Drummond phlox | |
| Phyla nodiflora | Texas frogfruit Turkey tangle fogfruit Frogfruit | |
| Physalis viscosa | Starhair groundcherry Yellow Ground Cherry | |
| Pinaropappus roseus | White rock lettuce White dandelion Pink dandelion | |
| Plantago helleri | Heller's plantain | |
| Plantago rhodosperma | Redseed plantain Red-seeded Plantain | |
| Polanisia dodecandra | Clammyweed Redwhisker clammyweed | |
| Polygala lindheimeri | Shrubby milkwort Purple milkwort | |
| Polygonum pensylvanicum | Pennsylvania smartweed Pink Smartweed | |
| Portulaca pilosa | Chisme Kiss me quick | |
| Polytaenia texana | Texas prairie parsley Texas-Parsley | |
| Proboscidea louisianica | Devil's claw Ram's horn Unicorn plant Proboscis flower | |
| Ptelea trifoliata | Wafer ash Common hoptree Hop tree | |
| Ratibida columnifera | Mexican hat Prairie coneflower Upright prairie coneflower Red-spike mexican-hat Long-headed coneflower Thimbleflower | |
| Ranunculus sceleratus | Cursed buttercup | |
| Rhus aromatica | Fragrant sumac Aromatic sumac Lemon sumac Polecat bush | |
| Rhynchospora colorata | Starrush whitetop Star sedge White-topped sedge Whitetop sedge | |
| Rhus lanceolata | Prairie flameleaf sumac Flame-leaf sumac Prairie sumac Lance-leaf sumac | |
| Rhynchosida physocalyx | Bladderpod sida Buffpetal | |
| Rhynchosia senna var. texana | Texas Snout-bean Texas snoutbean | |
| Rudbeckia hirta | Black-eyed Susan Common black-eyed Susan Brown-eyed Susan | |
| Ruellia humilis | Fringeleaf wild petunia Hairy ruellia Low wild Petunia Low ruellia | |
| Ruellia metziae | Metz Wild Petunia Metz's wild petunia Wild White Petunia | |
| Ruellia nudiflora | Violet ruellia Common wild petunia Violet wild petunia Wild petunia | |
| Rubus trivialis | Dewberry Southern dewberry | |
| Sabatia campestris | Texas star Rose gentian Meadow pink Prairie rose-gentian Prairie sabatia | |
| Salvia coccinea | Scarlet Sage Tropical Sage Blood sage | |
| Samolus ebracteatus ssp. cuneatus | Limerock Brookweed Limewater brookweed | |
| Salvia farinacea | Mealy blue sage Mealy sage Mealycup sage | |
| Sambucus nigra ssp. canadensis | Common elderberry Black elder Mexican elderberry Common elder Elderberry Tapiro Sauco | |
| Salvia texana | Texas sage Blue sage | |
| Samolus valerandi ssp. parviflorus | Seaside brookweed Water Pimpernel Thin-leaf Brookweed | |
| Scutellaria drummondii | Drummond's skullcap | |
| Schoenocaulon texanum | Green Lily Texas feathershank Texas Sabadilla | |
| Sesbania drummondii | Poisonbean Rattlebush Rattlebox | |
| Setaria parviflora | Marsh bristlegrass Knotroot bristlegrass | |
| Sisyrinchium biforme | Wiry blue-eyed grass | |
| Simsia calva | Awnless bush sunflower Bush sunflower | |
| Sisyrinchium chilense | Sword-leaf Blue-eyed Grass Swordleaf blue-eyed grass | |
| Sida longipes | Stockflower fanpetals | |
| Silphium radula | Roughstem rosinweed | |
| Solidago altissima | Tall Goldenrod Late goldenrod Canadian goldenrod Canada goldenrod | |
| Solanum dimidiatum | Western horsenettle Western Horse-Nettle | |
| Solidago nemoralis | Gray goldenrod Prairie goldenrod Old field goldenrod | |
| Solanum ptycanthum | Eastern Black Nightshade West Indian Nightshade Common Nightshade Black Nightshade | |
| Solanum rostratum | Buffalobur nightshade Buffalo bur | |
| Stellaria prostrata | Prostrate starwort | |
| Stillingia texana | Texas Queen's Delight Queen's Delight Texas toothleaf | |
| Taraxacum officinale | Common dandelion Blowball Dandelion Faceclock | |
| Teucrium canadense | Canada germander American germander Canadian germander Germander Hairy germander Wood sage | |
| scientific name | common name(s) | image gallery |