| SPECIES | COMMON NAME | FAMILY | COLOR |
| Abutilon fruticosum (Abutilon texense) |
Texas Indian Mallow, Pelotazo | Malvaceae (Mallow) | Yellow |
| Abutilon malacum | Yellow Indian Mallow | Malvaceae (Mallow) | Yellow |
| Acalypha phleoides (Acalypha lindheimeri) |
Shrubby Copperleaf | Euphorbiaceae (Spurge) | Red |
| Achillea millefolium | Yarrow, Milfoil | Asteraceae (Sunflower) | White |
| Acleisanthes longiflora | Angel's Trumpets | Nyctaginaceae (Four O'clock) | White |
| Acleisanthes wrightii | Wright's Trumpets | Nyctaginaceae (Four O'clock) | White |
| Acmispon oroboides (Lotus plebeius) |
New Mexico Bird's-foot Trefoil, Pine Deervetch | Fabaceae (Pea) | Yellow |
| Acourtia runcinata | Featherleaf Desertpeony, Peonia | Asteraceae (Sunflower) | Pink |
| Acourtia wrightii | Pink Perezzia, Brownfoot, Wright's Desertpeony | Asteraceae (Sunflower) | Pink |
| Aesculus pavia var. pavia | Red Buck-eye | Sapindaceae (Soapberry) | Red |
| Agalinis edwardsiana | Plateau False Foxglove | Orobanchaceae (Broomrape) | Pink |
| Agalinis fasciculata | Beach False Foxglove | Orobanchaceae (Broomrape) | Pink |
| Agalinis heterophylla | Prairie False Foxglove, Prairie Gerardia | Orobanchaceae (Broomrape) | Pink |
| Agalinis strictifolia | Stiff-leaf False Foxglove | Orobanchaceae (Broomrape) | Pink |
| Agave havardiana | Century Plant, Havard Agave | Asparagaceae (Asparagus) | Yellow |
| Agave lecheguilla Agave lechuguilla |
Lecheguilla | Asparagaceae (Asparagus) | Red |
| Ageratina havanensis (Eupatorium havanense) |
Shrubby Boneset, Havana Snakeroot | Asteraceae (Sunflower) | White |
| Ageratina wrightii (Eupatorium wrightii) |
Wright's Snakeroot, Wright Ageratina | Asteraceae (Sunflower) | White |
| Albizia julibrissin | Mimosa, Silktree | Fabaceae (Pea) | Pink |
| Alliona choisyi | Annual Windmills | Nyctaginaceae (Four O’clock) | Pink |
| Alliona incarnata | Trailing Four O’clock, Trailing Windmills | Nyctaginaceae (Four O’clock) | Pink |
| Allium canadense var. canadense | Meadow Garlic | Amaryllidaceae (Amaryllis) | White |
| Allium canadense var. fraseri | Fraser Meadow Garlic | Amaryllidaceae (Amaryllis) | White |
| Allium drummondii | Drummond’s Onion, Prairie Onion | Amaryllidaceae (Amaryllis) | Pink |
| Allowissadula holosericea | Velvet-leaf Mallow | Malvaceae (Mallow) | Yellow |
| Alophia drummondii | Propeller Flower | Iridaceae (Iris) | Purple |
| Aloysia gratissima | Beebrush, Whitebrush | Verbenaceae (Verbena) | White |
| Aloysia wrightii | Wright's Beebrush | Verbenaceae (Verbena) | White |
| Amaranthus palmeri | Palmer's Amaranth, Carelessweed | Amaranthaceae (Amaranth) | White |
| Amblyolepis setigera | Huisache Daisy | Asteraceae (Sunflower) | Yellow |
| Ambrosia monogyra (Hymenoclea monogyra) |
Single Whorl Burro-brush | Asteraceae (Sunflower) | White |
| Ambrosia psilostachya | Cuman Ragweed, Perennial Ragweed | Asteraceae (Sunflower) | Yellow |
| Ammannia coccinea | Valley Redstem | Lythraceae (Loostrife) | Pink |
| Amorpha fruticosa | False Indigo Bush | Fabaceae (Pea) | Purple |
| Amphiachyris amoena (Gutierrezia amoena, Xanthocephalum amoenum) |
Texas Broomweed | Asteraceae (Sunflower) | Yellow |
| Amsonia ciliata | Texas Bluestar, Fringed Bluestar | Apocynaceae (Dogbane) | White |
| Amsonia longiflora | Tubular Bluestar | Apocynaceae (Dogbane) | White |
| Amsonia palmeri | Palmer's Bluestar | Apocynaceae (Dogbane) | White |
| Anagallis arvensis (Lysimachia arvensis) |
Scarlet Pimpernel | Primulaceae (Primrose) | Orange |
| Androstephium coeruleum | Blue Funnel-lily | Asparagaceae (Asparagus) | >Blue |
| Anemone berlandieri (Anemone heterophylla) |
Ten-petal Anemone, Windflower | Ranunculaceae (Buttercup) | White |
| Anemone berlandieri (Anemone heterophylla) |
Ten-petal Anemone, Windflower | Ranunculaceae (Buttercup) | Blue |
| Anisacanthus linearis | Big Bend Acanthus, Dwarf Anisacanth, Narrowleaf Desert Honeysuckle | Acanthaceae (Acanthus) | Red |
| Anisacanthus quadrifidus var. wrightii | Flame Acanthus, Wright's Desert Honeysuckle, Hummingbird Bush | Acanthaceae (Acanthus) | Red |
| Anulocaulis eriosolenus | Big Bend Ringstem | Nyctaginaceae (Four O'clock) | Pink |
| Aphanostephus ramosissimus | Plains Dozedaisy, Plains Lazy Daisy | Asteraceae (Sunflower) | White |
| Aphanostephus skirrhobasis | Arkansas Dozedaisy, Arkasas Lazy Daisy | Asteraceae (Sunflower) | White |
| Aquilegia hinkleyana (Aquilegia chrysantha var. hinckleyana) |
Texas Gold Columbine | Ranunculaceae (Buttercup) | Yellow |
| Aquilegia longissima | Long Spur Columbine | Ranunculaceae (Buttercup) | Yellow |
| Arbutus xalapensis | Texas Madrone | Ericaceae (Heath) | White |
| Argemone albiflora | White Prickly Poppy | Papaveraceae (Poppy) | White |
| Argemone aurantiaca | Texas Prickly Poppy | Papaveraceae (Poppy) | White |
| Argemone chisosensis | Chisos Mountain Prickly Poppy | Papaveraceae (Poppy) | White |
| Argemone mexicana | Mexican Prickly Poppy | Papaveraceae (Poppy) | Yellow |
| Argemone polyanthemos | Crested Prickly Poppy | Papaveraceae (Poppy) | White |
| Argemone squarrosa | Hedgehog Prickly Poppy | Papaveraceae (Poppy) | White |
| Arriocarpus fissuratus var. fissuratus (Mammillaria fissurata) |
Living Rock Cactus, Chautle Living-rock | Cactaceae (Cactus) | Pink |
| Artemisia ludoviciana | White Sagebrush, Silver Wormweed | Asteraceae (Sunflower) | Yellow |
| Asclepias asperula | Antelope Horn | Apocynaceae (Dogbane) | White |
| Asclepias oenotheroides | Zizotes Milkweed | Apocynaceae (Dogbane) | White |
| Astragalus crassicarpus var. berlandieri | Groundplum Milkvetch, Berlandieri's Milkvetch | Fabaceae (Pea) | White |
| Astragalus gracilis | Slender Milkvetch | Fabaceae (Pea) | Purple |
| Astragalus leptocarpus | Rare Loco Milkvetch, Slimpod Milkvetch | Fabaceae (Pea) | Purple |
| Astragalus missouriensis | Missouri Milkvetch | Fabaceae (Pea) | Purple |
| Astragalus nuttallianus var. austrinus | Smallflowered Milkvetch, Rio Fronteras Milkvetch | Fabaceae (Pea) | Purple |
| Astragalus nuttallianus var. nuttallianus | Smallflowered Milkvetch, Turkey Pea | Fabaceae (Pea) | Purple |
| SPECIES | COMMON NAME | FAMILY | COLOR |
| Baccharis halimifolia | Easter Baccharus, Groundseltree, Consumption-weed | Asteraceae (Sunflower) | White |
| Baccharis neglecta | Poverty Weed, Rooseveltweed | Asteraceae (Sunflower) | White |
| Baccharis salicifolia (Baccharis glutinosa) |
Mule-fat | Asteraceae (Sunflower) | White |
| Bahia absinthifolia | Yerba Raton, Hairy Bahia | Asteraceae (Sunflower) | Yellow |
| Baileya multiradiata | Desert Marigold | Asteraceae (Sunflower) | Yellow |
| Baptisia bractaea | Long-bract Wild Indigo | Fabaceae (Pea) | Yellow |
| Bauhinia lunarioides | Anacacho Orchid Tree, Texas Plume | Fabaceae (Pea) | White |
| Bellardia trixago | Mediterranean Lineseed, Bellardia | Orobanchaceae (Broomrape) | White |
| Berberis trifoliolata (Mahonia trifoliolata) |
Agarita | Berberidaceae (Barberry) | Yellow |
| Berlandiera lyrata | Lyreleaf Greeneyes | Asteraceae (Sunflower) | Yellow |
| Berlandiera texana (Belandiera betonicifolia) |
Texas Greeneyes | Asteraceae (Sunflower) | Yellow |
| Bidens bigelovii | Bigelow's Beggarticks | Asteraceae (Sunflower) | White |
| Bidens frondosa | Devil's Beggarticks | Asteraceae (Sunflower) | Yellow |
| Bidens laevis | Smooth Beggarticks | Asteraceae (Sunflower) | Yellow |
| Bifora americana (Atrema americanum) |
Prairie Bishop's-weed, Prairie Bishop | Apiaceae (Parsley) | White |
| Bignonia capreolata | Crossvine | Bignoniaceae (Bignonia) | Red |
| Boerhavia coccinea | Scarlet Spiderling | Nyctaginaceae (Four O'clock) | Pink |
| Boerhavia gracillima | Slim-stalk Spiderling | Nyctaginaceae (Four O'clock) | Red |
| Borrichia frutescens | Bushy Sea Oxeye, Bushy Seaside Tansy | Asteraceae (Sunflower) | Yellow |
| Bouchetia anomala (Bouchetia erecta) |
Painted-tongue | Solonaceae (Nightshade) | White |
| Bouteloua curtipendula | Sideoats Grama | Poaceae (Grass) | Green |
| Bouteloua dactyloides (Buchloe dactyloides) |
Buffalo Grass | Poaceae (Grass) | White/Green |
| Bouvardia ternifolia (Bouvardia glaberrima) |
Firecracker Bush, Scarlet Bouvardia | Rubiaceae (Madder) | Red |
| Bradburia pilosa (Chrysopsis pilosa, Heterotheca pilosa) |
Soft Goldenaster | Asteraceae (Sunflower) | Yellow |
| Brazoria truncata var. truncata | Rattlesnake Flower | Lamiaceae (Mint) | Pink |
| Brickellia cylindraceae | Gravel-bar Brickellbush | Asteraceae (Sunflower) | Yellow |
| Brickellia eupatorioides var. chlorolepis (Brickellia chlorolepis, Kuhnia chlorolepis) |
False Boneset | Asteraceae (Sunflower) | Yellow |
| Brickellia veronicifolia | Veronicaleaf Brickellbush | Asteraceae (Sunflower) | Yellow |
| Buddleja marrubiifolia | Woolly Butterfly-bush | Buddlejaceae (Butterfly-bush) | Orange |
| Buglossoides arvensis (Lithospermum arvense) |
Corn Gromwell | Boraginaceae (Forget-Me-Not) | White |
| SPECIES | COMMON NAME | FAMILY | COLOR |
| Campsis radicans | Trumpet Creeper | Bignoniaceae (Trumpet-creeper) | Red |
| Callicarpa americana | American Beautyberry | Lamiaceae (Mint) | White |
| Callirhoe involucrata var. involucrata | Winecup, Purple Poppymallow | Malvaceae (Mallow) | Pink |
| Callirhoe involucrata var. lineariloba | White Winecup, Slim-lobe Poppymallow | Malvaceae (Mallow) | Pink |
| Callirhoe pedata (Callirhoe digitata var. stipulata) |
Palmleaf Poppymallow, Finger Poppymallow | Malvaceae (Mallow) | Pink |
| Capsella bursa-pastoris | Shepherd's-purse | Brassicaceae (Mustard) | White |
| Capsicum annuum var. glabriusculum | Chili Pequin, Chilipiquin, Bird Pepper | Solanaceae (Nightshade) | White |
| Cardiospermum halicacabum | Balloon-vine, Love-in-a-puff | Sapindaceae (Soapberry) | White |
| Carpochaete bigelovii | Bigelow's Bristlehead | Asteraceae (Sunflower) | White |
| Castilleja citrina (Castilleja purpurea var. citrina) |
Prairie Indian Paintbrush | Orobanchaceae (Broomrape) | Yellow |
| Castilleja indivisa | Texas Paintbrush | Orobanchaceae (Broomrape) | Red |
| Castilleja integra | Whole-leaf Indian Paintbrush, Squaw Paintbrush | Orobanchaceae (Broomrape) | Red |
| Castilleja lanata | Woolly Paintbrush | Orobanchaceae (Broomrape) | Red |
| Castilleja lindheimeri (Castilleja purpurea var. lindheimeri) |
Lindheimer's Indian Paintbrush | Orobanchaceae (Broomrape) | Orange |
| Castilleja purpurea (Castilleja purpurea var. purpurea) |
Downy Indian Paintbrush | Orobanchaceae (Broomrape) | Pink |
| Castilleja sessiliflora | Great Plains Indian Paintbrush, Downy Paintcup | Orobanchaceae (Broomrape) | Yellow |
| Cenchrus ciliaris (Pennisetum ciliare) |
Buffelgrass | Poaceae (Grass) | Purple |
| Centaurea melitensis | Maltese Star Thistle, Tocalote | Asteraceae (Sunflower) | Yellow |
| Centrosema virginianum | Butterfly Pea | Fabaceae (Pea) | Lavender |
| Cephalanthus occidentalis | Buttonbush | Rubiaceae (Madder) | White |
| Cerastium glomeratum | Sticky Chickweed | Caryophyllaceae (Pink) | White |
| Cercis canadensis var. texensis | Texas Redbud | Fabaceae (Pea) | Pink |
| Cevallia sinuata | Stinging Serpent, Stinging Cevallia | Loasaceae (Stickleaf) | Yellow |
| Chaerophyllum tainturieri | Chervil | Apiaceae (Parsley) | White |
| Chaetopappa asteroides | Least Daisy, Arkansas Leastdaisy | Asteraceae (Sunflower) | White |
| Chaetopappa bellidifolia | Whiteray Leastdaisy | Asteraceae (Sunflower) | Purple |
| Chaetopappa ericoides | Rose Heath, Small-flower Aster | Asteraceae (Sunflower) | White |
| Chamaecrista fasciculata | Partridge Pea | Fabaceae (Pea) | Yellow |
| Chamaesaracha coniodes | False Nightshade | Solanaceae (Nightshade) | White |
| Chamaesaracha sordida | Hairy Five-eyes, Hairy False Nightshade | Solanaceae (Nightshade) | White |
| Chamaesaracha villosa | Woolly False Nightshade, Trans-Pecos Five-eyes | Solanaceae (Nightshade) | White |
| Chaptalia texana | Silver Puff | Asteraceae (Sunflower) | White |
| Chilopsis linearis | Desert Willow | Bignoniaceae (Trumpet-Creeper) | Pink |
| Chloracantha spinosa | Spiny Chloracantha, Mexican Devil-weed | Asteraceae (Sunflower) | White |
| Chrysactinia mexicana | Damianita | Asteraceae (Sunflower) | Yellow |
| Cirsium horridulum | Bristle Thistle, Yellow Thistle | Asteraceae (Sunflower) | Yellow |
| Cirsium texanum | Texas Thistle | Asteraceae (Sunflower) | Pink |
| Clematis drummondii | Old-man's Beard, Drummond's Clematis | Ranunculaceae (Buttercup) | White |
| Clematis pitcheri | Purple Leatherflower, Bluebill | Ranunculaceae (Buttercup) | Purple |
| Clematis terniflore (Clematis dioscoriefolia) |
Sweet Autumn Virgin's-bower | Ranunculaceae (Buttercup) | White |
| Clematis texensis | Scarlet Leatherflower, Texas Clematis | Ranunculaceae (Buttercup) | Red |
| Cleomella longipes | Chiricahua Mountain Stinkweed | Cleomaceae (Cleome) | Yellow |
| Cnidoscolus texanus | Texas Bullnettle Mala Mujer |
Euphorbiaceae (Spurge) | White |
| Commelina erecta | Dayflower | Commelinaceae (Spiderwort) | Blue |
| Conium maculatum | Poison Hemlock | Apiaceae (Parsley) | White |
| Conoclinium betonicifolium (Eupatorium betonicifolium) |
Betonyleaf Mistflower | Asteraceae (Sunflower) | Blue |
| Conoclinium coelestinum (Eupatorium coelestinum) |
Blue Mistflower | Asteraceae (Sunflower) | Blue |
| Conoclinium dissectum (Conoclinium greggii, Eupatorium greggii) |
Palmleaf Thoroughwort, Mistflower | Asteraceae (Sunflower) | Blue |
| Convolvulus equitans | Texas Bindweed | Convolvulaceae (Morning Glory) | White |
| Cordia boissieri | Texas Olive, Anacahuita, Mexican Olive | Cordiaceae (Cordia) | White |
| Coreopsis basalis | Goldenmane Tickseed, Golden-wave | Asteraceae (Sunflower) | Yellow |
| Coreopsis lanceolata | Lance-leaf Tickseed, Lance Coreopsis | Asteraceae (Sunflower) | Yellow |
| Coreopsis nuecensis | Crown Tickseed, Nueces Coreopsis | Asteraceae (Sunflower) | Yellow |
| Cornus drummondii | Roughleaf Dogwood | Cornaceae (Dogwood) | White |
| Corydalis curvisiliqua | Curvepod Fumewort, Scrambled Eggs | Papaveraceae (Poppy) | Yellow |
| Coryphantha sulcata | Nipple Cactus, Finger Cactus, Pineapple Cactus | Cactaceae (Cactus) | Yellow |
| Coryphantha tuberculosa var. tuberculosa (Escobaria tuberculosa, Mammillaria tuberculosa) |
Cob Cactus, White Column Foxtail Cactus | Cactaceae (Cactus) | Pink |
| Cosmos sulphureus | Sulphur Cosmos | Asteraceae (Sunflower) | Orange |
| Coursetia axillaris | Texas Babybonnets | Fabaceae (Pea) | White |
| Crinum bulbispermum | Hardy Swamp Lily | Amaryllidaceae (Amaryllis) | White |
| Croptilon divaricatum | Slender Scratch-daisy, Goldenweed | Asteraceae (Sunflower) | Yellow |
| Croptilon rigidifolium (Croptilon divaricatum var. hirtellum) |
Stiff-leaf Scratch-daisy | Asteraceae (Sunflower) | Yellow |
| Croton glandulosus var. pubentissima | Tropic Croton, Vente Conmigo, Sand Croton | Euphorbiaceae (Spurge) | White |
| Croton heptalon | Texas Woolly Croton | Euphorbiaceae (Spurge) | White |
| Croton lindheimeri (Croton capitatus var. lindheimeri) |
Hogwort, Lindheimer's Hogwort, Woolly Goatweed | Euphorbiaceae (Spurge) | White |
| Croton monanthogynus | One-seed Croton, Prairie Tea | Euphorbiaceae (Spurge) | White |
| Croton pottsii var. pottsi | Leatherstem | Euphorbiaceae (Spurge) | White |
| Cryptantha crassipes (Oreocarya crassipes) |
Terlingua Creek Catseye, Terlingua Creek Cryptantha | Boraginaceae (Forget-me-not) | White |
| Cryptantha crassisepala | Thicksepal Catseye, Thicksepal Cryptantha | Boraginaceae (Forget-me-not) | White |
| Cryptantha minima | Little Catseye, Little Cryptantha | Boraginaceae (Forget-me-not) | White |
| Cucumis melo | Cantaloupe | Cucurbitaceae (Gourd) | Yellow |
| Cucurbita foetidissima | Buffalo Gourd | Cucurbitaceae (Gourd) | Yellow |
| Cyclospermum leptophyllum (Apium leptophyllum) |
Marsh Parsley | Apiaceae (Parsley) | White |
| Cylindropuntia imbricata var. argentea (Opuntia imbricata var. argentea) |
Tree Cholla, Cane Cholla | Cactaceae (Cactus) | Pink |
| Cylindropuntia imbricata var. imbricata (Opuntia imbricata var. imbricata, Opuntia imbricata var. arborescens) |
Tree Cholla, Cane Cholla | Cactaceae (Cactus) | Pink |
| Cylindropuntia leptocaulis | Pencil Cactus, Desert Christmas Cactus | Cactaceae (Cactus) | Yellow |
| Cyperus echinatus | Globe Flatsedge | Cyperaceae (Sedge) | Green |
| Cyperus odoratus | Fragrant Flatsedge, Rusty Flatsedge | Cyperaceae (Sedge) | Green |
| Cyperus virens | Green Flatsedge | Cyperaceae (Sedge) | Green |
| Cyphomeris gypsophiloides (Boerhavia gypsophiloides) |
Red Cyphomeris | Nyctaginaceae (Four O'clock) | Pink |
| SPECIES | COMMON NAME | FAMILY | COLOR |
| Dalea aurea | Golden Dalea, Golden Prairie-clover | Fabaceae (Pea) | Yellow |
| Dalea emarginata | Wedge-leaf Prairie-clover | Fabaceae (Pea) | Pink |
| Dalea enneandra | Nine-anther Prairie-clover, Bigtop Dalea | Fabaceae (Pea) | White |
| Dalea formosa | Feather Dalea, Featherplume | Fabaceae (Pea) | Pink |
| Dalea frutescens | Black Dalea | Fabaceae (Pea) | Pink |
| Dalea neomexicana | Downy Prairie-clover | Fabceae (Pea) | Yellow |
| Dalea obovata (Petalostemum obovatum) |
Pussyfoot | Fabaceae (Pea) | White |
| Dalea phleoides var. microphylla | Slim-spike Prairie-clover | Fabceae (Pea) | White |
| Dalea wrightii | Wright Prairie-clover | Fabceae (Pea) | Yellow |
| Dasylirion leiophyllum | Sotol, Green Sotol | Asparagaceae (Asparagus) | Yellow |
| Dasyochloa pulchella | Low Woollygrass, Fluffgrass | Poaceae (Grass) | White |
| Datura wrightii | Jimson-weed, Sacred Thorn Apple | Solanaceae (Nightshade) | White |
| Daucus pusillus | Rattlesnake Weed, American Wild Carrot | Apiaceae (Parsley) | White |
| Delphinium carolinianum ssp. vimineum | Blue Larkspur, Pine Woods Larkspur, Carolina Larkspur | Ranunculaceae (Buttercup) | Blue |
| Delphinium carolinianum ssp. virescens | Prairie Larkspur, White Larkspur, Carolina Larkspur | Ranunculaceae (Buttercup) | White |
| Dermatophyllum secundiflorum (Sophora secundiflora) |
Texas Mountain Laurel, Mescal Bean | Fabaceae (Pea) | Purple |
| Descurania pinnata | Tansy Mustard, Western Tansymustard | Brassicaceae (Mustard) | Yellow |
| Desmanthus reticulatus | Netleaf Bundleflower | Fabaceae (Pea) | White |
| Desmodium ciliare | Hairy Small-leaf Tickclover, Littleaf Tickclover | Fabaceae (Pea) | Pink |
| Desmodium glabellum | Dillenius' Ticktrefoil | Fabaceae (Pea) | Pink |
| Desmodium incanum (Desmodium canum) |
Creeping Beggarweed, Tickclover | Fabaceae (Pea) | Pink |
| Desmodium paniculatum | Panicled Tickclover, Panicled Ticktrefoil, Panicledleaf Ticktrefoil | Fabaceae (Pea) | Pink |
| Diaperia prolifera (Evax prolifera) |
Big-head Pygmy-cudweed, Big-head Rabbit-tobacco | Asteraceae (Sunflower) | White |
| Diaperia verna (Evax verna) |
Spring Pygmy-cudweed, Spring Rabbit-tobacco | Asteraceae (Sunflower) | White |
| Digitaria californica (Trichachne californica) |
Arizona Cottontop | Poaceae (Grass) | White |
| Dimorphocarpa candicans (Dithyrea wislizeni var. palmeri) |
Palmer's Spectacle Pod | Brassicaceae (Mustard) | White |
| Diodella teres (Diodia teres, Hexasepalum teres) |
Poor Joe, Rough Buttonweed | Rubiceae (Madder) | White |
| Diodia virginiana | Virginia Buttonweed | Rubiceae (Madder) | White |
| Diospyros texana | Texas Persimmon | Ebenaceae (Ebony) | White |
| Dyschoriste schiedeana var. decumbens (Dyschoriste decumbens) |
Spreading Snakeherb | Acanthaceae (Acanthus) | Purple |
| Dyssodia papposa | Fetid Marigold, Dogweed | Asteraceae (Sunflower) | Yellow |
| SPECIES | COMMON NAME | FAMILY | COLOR |
| Echinacea purpurea | Purple Coneflower, Eastern Purple Coneflower | Asteraceae (Sunflower) | Purple |
| Echinocactus texensis | Horse Crippler | Cactaceae (Cactus) | Pink |
| Echinocereus coccineus var. paucispinus | Claret Cup Cactus, Scarlet Hedgehog Cactus | Cactaceae (Cactus) | Red |
| Echinocereus coccineus ssp. roemeri | Claret Cup Cactus, Scarlet Hedgehog Cactus | Cactaceae (Cactus) | Red |
| Echinocereus coccineus ssp. transpecosensis | Claret Cup Cactus, Scarlet Hedgehog Cactus | Cactaceae (Cactus) | Red |
| Echinocereus dasyacanthus (Echinocereus pectinatus var. neomexicanus) |
Texas Rainbow Cactus, Spiny Hedgehog Cactus | Cactaceae (Cactus) | Yellow |
| Echinocereus enneacanthus ssp. enneacanthus | Strawberry Hedgehog Cactus | Cactaceae (Cactus) | Pink |
| Echinocereus reichenbachii ssp. caespitosus | Lace Cactus | Cactaceae (Cactus) | Pink |
| Echinocereus stramineus | Strawberry Cactus | Cactaceae (Cactus) | Pink |
| Echinocereus viridiflorus var. russanthus (Echinocereus russanthus, Echinocereus russanthus ssp. russanthus) |
Rusty Hedgehog Cactus | Cactaceae (Cactus) | Red |
| Eclipta prostrata (Eclipta alba) |
False Daisy | Asteraceae (Sunflower) | White |
| Elephantopus carolinianus | Carolina Elephant's-foot, Leafy Elephant's-foot | Asteraceae (Sunflower) | Purple |
| Engelmannia peristenia (Engelmannia pinnatifida) |
Engelmann’s Daisy | Asteraceae (Sunflower) | Yellow |
| Epixiphium wislizeni | Balloonbush, Snapdragon Vine | Plantaginaceae (Plantain) | Blue |
| Erigeron annuus | Annual Fleabane, Eastern Daisy Fleabane | Asteraceae (Sunflower) | White |
| Erigeron modestus | Plains Fleabane | Asteraceae (Sunflower) | White |
| Erigeron philadelphicus | Philadelphia Fleabane | Asteraceae (Sunflower) | White |
| Erigeron strigosus | Daisy Fleabane, Prairie Fleabane | Asteraceae (Sunflower) | White |
| Eriogonum annuum | Annual Buckwheat, Wild Buckwheat | Polygonaceae (Buckwheat) | White |
| Eriogonum jamesii var. undulatum | James' Buckwheat | Polygonaceae (Buckwheat) | White |
| Eriogonum longifolium var. longifolium (Eriogonum longifolium var. lindheimeri) |
Longleaf Buckwheat | Polygonaceae (Buckwheat) | White |
| Erigonum multiflorum var. riograndis | Rio Grande Buckwheat, Heart-sepal Wild Buckwheat | Polygonaceae (Buckwheat) | White |
| Eriogonum wrightii | Shrubby Buckwheat, Wright's Bastardsage | Polygonaceae (Buckwheat) | White |
| Erodium cicutarium | Redstem Stork’s Bill | Geraniaceae (Geranium) | Pink |
| Erodium texanum | Texas Stork’s Bill | Geraniaceae (Geranium) | Purple |
| Eryngium leavenworthii | Eryngo, Leavenworth's Eryngo | Apiaceae (Parsley) | Purple |
| Erythrina herbacea | Coralbean, Eastern Coralbean, Redcardinal | Fabaceae (Pea) | Red |
| Eschscholzia californica ssp. mexicana (Eschscholzia mexicana) |
Mexican Gold Poppy, California Gold Poppy | Papaveraceae (Poppy) | Yellow |
| Eucnide bartonioides | Rock-nettle, Yellow Stingbush | Loasaceae (Stickleaf) | Yellow |
| Eupatorium serotinum | White Boneset, Late-flowering Thoroughwort | Asteraceae (Sunflower) | White |
| Euphorbia albomarginata | Rattlesnake Weed, Whitemargined Sandmat | Euphorbiaceae (Spurge) | White |
| Euphorbia antisyphilitica | Candelilla | Euphorbiaceae (Spurge) | Pink |
| Euphorbia corollata | Flowering Spurge | Euphorbiaceae (Spurge) | White |
| Euphorbia dentata | Toothed Spurge, Toothed-leaf Poinsettia | Euphorbiaceae (Spurge) | White |
| Euphorbia eriantha | Beetle Spurge, Woolly-flower Spurge | Euphorbiaceae (Spurge) | White |
| Euphorbia indivisa (Chamaesyce dioica, Euphorbia dioica var. indivisa) |
Royal Sandmat | Euphorbiaceae (Spurge) | White |
| Euphorbia marginata | Snow-on-the-mountain | Euphorbiaceae (Spurge) | White |
| Eustoma exaltatum (Eustoma grandiflorum Eustoma russellianum) |
Bluebells, Texas Bluebells, Catchfly Prairie Gentian | Gentianaceae (Gentian) | Purple |
| Evolvulus alsinoides | Slender Dwarf Morning-glory | Convolvulaceae (Morning Glory) | Blue |
| Evolvulus sericeus | Silver Dwarf Morning-glory, White Evolvulus | Convolvulaceae (Morning Glory) | White |
| Eysenhardtia texana | Texas Kidneywood, Bee-brush | Fabaceae (Pea) | White |
| SPECIES | COMMON NAME | FAMILY | COLOR |
| Fallugia paradoxa | Apache Plume | Rosaceae (Rose) | White |
| Fouquieria splendens | Ocotillo | Fouquieriaceae (Ocotillo) | Red |
| Fraxinus cuspidata | Fragrant Ash | Oleacea (Olive) | White |
| Froehlichia gracilis | Slender Snake-cotton | Amaranthacea (Amaranth) | White |
| Funastrum cynanchoides var. cynanchoides (Sarcostemma cynanchoides var. cynanchoides) |
Climbing Milkweed, Fringed Twinevine | Amaranthacea (Amaranth) | White |
| Gaillardia amblyodon | Red Gaillardia, Maroon Blanketflower | Asteraceae (Sunflower) | >Red |
| Gaillardia pinnatifida | Red Dome Blanketflower | Asteraceae (Sunflower) | Yellow |
| Gaillardia pulchella | Indian Blanket, Blanketflower | Asteraceae (Sunflower) | Red |
| Gaillardia suavis | Perfumeballs, Seet Gaillardia, Pincushion Daisy | Asteraceae (Sunflower) | Orange |
| Galium aparine | Stickywilly, Catchweed Bedstraw, Cleavers | Rubiaceae (Madder) | White |
| Galphimia angustifolia | Narrowleaf Goldenshower | Malpighiaceae (Barbados-Cherry) | Yellow |
| Gelsemium sempervirens | Carolina Jessamine, Evening Trumpetflower | Loganiaceae (Logania) | Yellow |
| Geranium carolinianum | Carolina Crane's-bill | Geraniaceae (Geranium) | White |
| Geranium dissectum | Cut-leaf Geranium, Cut-leaf Crane's-bill | Geraniaceae (Geranium) | Pink |
| Geum canadense | White Avens | Rosaceae (Rose) | White |
| Giliastrum incisum (Gilia incisa) |
Cut-leaf Gilia, Split-leaf Gilia | Polemoniaceae (Phlox) | Blue |
| Giliastrum rigidulum (Gilia rigidula) |
Blue Gilia, Bluebowls | Polemoniaceae (Phlox) | Blue |
| Glandularia bipinnatifida var. bipinnatifida (Verbena bipinnatifida) |
Prairie Verbena, Dakota Mock Vervain | Verbenaceae (Verbena) | Purple |
| Glandularia bipinnatifida var. ciliata (Glandularia wrightii) (Verbena wrightii) |
Desert Verbena, Davis Mountain Mock Vervain | Verbenaceae (Verbena) | Purple |
| Glandularia pumila (Verbena pumila) |
Low Verbena, Pink Mock Vervain | Verbenaceae (Verbena) | Purple |
| Glandularia quadrangulata (Verbena quadrangulata) |
Beaked Mock Vervain | Verbenaceae (Verbena) | White |
| Glaucium corniculatum | Blackspot Hornpoppy | Papaveraceae (Poppy) | Red |
| Gomphrena nealleyi | Nealley's Globe-amaranth | Amaranthaceae (Amaranth) | White |
| Gonolobus suberosus var. granulatus (Matelea gonocarpos) |
Anglepod Milkweed Vine | Apocynaceae (Dogbane) | Green |
| Grindelia ciliata (Grindelia papposa Prionopsis ciliata) |
Spanish Gold, Saw-leaf Daisy | Asteraceae (Sunflower) | Yellow |
| Grindelia squarrosa var. nuda | Curlycup Gumweed | Asteraceae (Sunflower) | Yellow |
| Grusonia aggeria | Clumped Dog Cholla, Jumping Dog Cholla | Cactaceae (Cactus) | Yellow |
| Grusonia grahamii | Graham's Dog Cholla | Cactaceae (Cactus) | Yellow |
| Guaiacum angustifolium (Porlieria angustifolia) |
Soapbush, Guyacan | Zygophyllaceae (Caltrop) | Purple |
| Guilleminea densa var. aggregata | Small Matweed | Amaranthaceae (Amaranth) | White |
| Gymnosperma glutinosum (Xanthocephalum glutinosum) |
Tatalencho, Gumhead | Asteraceae (Sunflower) | Yellow |
| SPECIES | COMMON NAME | FAMILY | COLOR |
| Haploesthes greggii var. texana | Texas False Broomweed | Asteraceae (Sunflower) | Yellow |
| Hechtia texensis | Texas False Agave, Guapilla | Bromeliaceae (Bromeliad) | White |
| Hedeoma acinoides | Slender False Pennyroyal, Slender Hedeoma | Lamiaceae (Mint) | Pink |
| Hedeoma costata var. pulchella | Ribbed False Pennyroyal | Lamiaceae (Mint) | Purple |
| Hedeoma drummondii | Mock Pennyroyal, Drummond's False Pennyroyal | Lamiaceae (Mint) | Pink |
| Hedypnois cretica | Cretanweed | Asteraceae (Sunflower) | Yellow |
| Helenium amarum var. amarum | Yellow Sneezeweed, Bitterweed | Asteraceae (Sunflower) | Yellow |
| Helenium amarum var. badium | Yellow Sneezeweed, Bitterweed | Asteraceae (Sunflower) | Yellow |
| Helenium elegans | Pretty Sneezeweed | Asteraceae (Sunflower) | Yellow |
| Helianthemum georgianum (Crocanthemum georgianum) |
Rockrose, Georgia Frostweed | Cistaceae (Rock-rose) | Yellow |
| Helianthus angustifolius | Swamp Sunflower, Narrowleaf Sunflower | Asteraceae (Sunflower) | Yellow |
| Helianthus annuus | Sunflower, Common Sunflower | Asteraceae (Sunflower) | Yellow |
| Helianthus argophyllus | Silver-leaf Sunflower | Asteraceae (Sunflower) | Yellow |
| Helianthus ciliaris | Texas Blueweed | Asteraceae (Sunflower) | Yellow |
| Helianthus maximiliani | Maximilian Sunflower | Asteraceae (Sunflower) | Yellow |
| Heliomeris longifolia var. annua | Longleaf False Goldeneye | Asteraceae (Sunflower) | Yellow |
| Heliotropium curassavicum | Seaside Heliotrope, Salt Heliotrope | Boraginaceae (Forget-me-not) | White |
| Heliotropium indicum | Indian Heliotrope | Boraginaceae (Forget-me-not) | Purple |
| Heliotropium procumbens (Euploca procumbens) |
Four-spike Heliotrope | Boraginaceae (Forget-me-not) | White |
| Heliotropium tenellum | Pasture Heliotrope | Boraginaceae (Forget-me-not) | White |
| Herbertia lahue | Prairie Nymph, Herbertia | Iridaceae (Iris) | Purple |
| Hesperidanthus linearifolius (Schoenocrambe linearifolia) |
Slimleaf Plainsmustard | Brassicaceae (Mustard) | Purple |
| Hesperaloe parviflora | Red Yucca, Redflower False Yucca | Asparagaceae (Asparagus) | Red |
| Heterotheca canescens | Gray Goldenaster | Asteraceae (Sunflower) | Yellow |
| Heterotheca stenophylla | Sticky Granite-daisy, Stiffleaf False Goldenaster | Asteraceae (Sunflower) | Yellow |
| Heterotheca subaxillaris (Heterotheca latifolia) |
Camphorweed, Goldenaster | Asteraceae (Sunflower) | Yellow |
| Hibiscus coulteri | Desert Rosemallow | Malvaceae (Mallow) | Yellow |
| Hibiscus denudatus | Desert Hibiscus | Malvaceae (Mallow) | Pink |
| Hibiscus grandiflorus | Swamp Rosemallow | Malvaceae (Mallow) | Pink |
| Hibiscus laevis (Hibiscus militaris) |
Halberd-leaf Rosemallow | Malvaceae (Mallow) | White |
| Hoffmannseggia glauca | Indian Rush-pea, Sickle-pod Rush-pea, Hog-potato | Fabaceae (Pea) | Yellow |
| Houstonia acerosa var. acerosa (Hedyotis acerosa var. acerosa) |
Needleaf Bluet | Rubiaceae (Madder) | Pink |
| Hunzikeria texana (Leptoglossis texana) |
Texas Cupflower | Solanaceae (Nightshade) | Pink |
| Hydrocotyle umbellata | Umbrella Pennyroyal, Manyflower Marshpennywort | Araliaceae (Ginseng) | White |
| Hymenocallis liriosme | Spring Spiderlily | Amaryllidaceae (Amaryllis) | White |
| Hymenopappus artemisiifolius | Old Plainsman | Asteraceae (Sunflower) | White |
| Hymenopappus scabiosaeus var. corymbosus | Carolina Woollywhite | Asteraceae (Sunflower) | White |
| Hymenopappus tenuifolius | Chalk Hill Woollywhite | Asteraceae (Sunflower) | White |
| Hypericum drummondii | Nits and Lice | Hypericaceae (St. John's Wort) | Yellow |
| Hypericum hypericoides (Ascyrum hypericoides) |
St. Andrew's Cross | Hypericaceae (St. John's Wort) | Yellow |
| Hypochaeris glabra | Smooth Cat's-ear | Asteraceae (Sunflower) | Yellow |
| SPECIES | COMMON NAME | FAMILY | COLOR |
| Ibervillea lindheimeri | Lindheimer's Globeberry, Balsamgourd | Cucurbitaceae (Gourd) | Yellow |
| Ilex decidua | Possumhaw, Possum Haw | Aquifoliaceae (Holly) | White |
| Ilex vomitoria | Yaupon Holly | Aquifoliaceae (Holly) | White |
| Indigofera miniata | Scarlet Pea | Fabacea (Pea) | Red |
| Ionactis linariifolia | Flaxleaf Whitetop Aster | Asteracea (Sunflower) | Purple |
| Ipomoea cordatotriloba (Ipomoea trichocarpa) |
Tievine, Purple Bindweed | Convolvulaceae (Morning Glory) | Purple |
| Ipomoea cristulata | Trans-Pecos Morning-glory | Convolvulaceae (Morning Glory) | Red |
| Ipomoea lindheimeri | Lindheimer's Morning-glory | Convolvulaceae (Morning Glory) | Purple |
| Ipomopsis aggregata | Scarlet Gilia, Skyrocket | Polemoniaceae (Phlox) | Red |
| Ipomopsis havardii | Havard's Ipomopsis, Havard's Skyrocket | Polemoniaceae (Phlox) | Pink |
| Ipomopsis longiflora | White-flowered Skyrocket, Long-flowered Ipomopsis | Polemoniaceae (Phlox) | White |
| Ipomopsis rubra | Standing Cypress, Texas Plume | Polemoniaceae (Phlox) | Red |
| Iresine heterophylla | Standley's Bloodleaf | Amaranthaceae (Amaranth) | White |
| Iris fulva | Copper Iris | Iridaceae (Iris) | Red |
| Isocoma pluriflora (Isocoma wrightii) |
Southern Goldenbush, Southern Jimmyweed | Asteraceae (Sunflower) | Yellow |
| Iva annua | Annual Marsh Elder, Sumpweed | Asteraceae (Sunflower) | Green |
| Jatropha dioica var. graminea | Leatherstem | Euphorbiaceae (Spurge) | Pink |
| Justicia americana | American Water-willow | Acanthaceae (Acanthus) | White |
| Justicia pilosella (Siphonoglossa pilosella) |
Gregg's tube-tongue, Tube-tongue | Acanthaceae (Acanthus) | Purple |
| Kallstroemia grandiflora | Arizona Poppy, Orange Caltrop | Zygophyllaceae (Caltrop) | Orange |
| Kallstroemia parviflora | Warty Caltrop | Zygophyllaceae (Caltrop) | Orange |
| Krameria erecta (Krameria glandulosa) |
Littleaf Ratany | Krameriaceae (Krameria) | Red |
| Krameria grayi (Krameria bicolor) |
White Ratany | Krameriaceae (Krameria) | Red |
| Krameria lanceolata | Trailing Ratany, Trailing Krameria | Krameriaceae (Krameria) | Red |
| Krigia caespitosa (Krigia oppositifolia) |
Dwarf Dandelion, Weedy Dwarfdandelion | Asteraceae (Sunflower) | Yellow |
| SPECIES | COMMON NAME | FAMILY | COLOR |
| Lactuca ludoviciana | Wild Lettuce, Louisiana Lettuce | Asteraceae (Sunflower) | Pink |
| Lactuca serriola | Prickly Lettuce | Asteraceae (Sunflower) | Yellow |
| Lamium amplexicaule | Henbit | Lamiaceae (Mint) | Purple |
| Lantana achyranthifolia (Lantana macropoda) |
Desert Lantana, Shrubverbena, Mejorana | Verbenaceae (Verbena) | White |
| Lantana horrida (Lantana urticoides) |
Texas Lantana, Calico Bush | Verbenaceae (Verbena) | Orange |
| Lantana montevidensis | Trailing Lantana, Trailing Shrubverbena | Verbenaceae (Verbena) | Pink |
| Larrea tridentata | Creosote Bush | Zygophyllaceae (Caltrop) | Yellow |
| Lechea tenuifolia | Narrow-leaf Pinweed | Cistaceae (Rockrose) | Red |
| Lepidium densiflorum | Common Peppergrass, Pepperweed | Brassicaceae (Mustard) | White |
| Lepidium virginicum | Peppergrass, Virginia Pepperweed | Brassicaceae (Mustard) | White |
| Lespedeza hirta | Hirta Lespedeza | Fabaceae (Pea) | White |
| Lespedeza procumbens | Trailing Lespedeza | Fabaceae (Pea) | Pink |
| Leucaena retusa | Littleleaf Leadtree | Fabaceae (Pea) | Yellow |
| Leucanthemum vulgare | Oxeye Daisy | Asteraceae (Sunflower) | White |
| Leucophyllum candidum | Boquillas Silverleaf, Brewster County Barometerbush | Scrophulariaceae (Figwort) | Purple |
| Leucophyllum frutescens | Texas Purple Sage, Texas Barometerbush, Cenizo | Scrophulariaceae (Figwort) | Purple |
| Liatris acidota | Sharp Gayfeather, Sharp Blazing Star | Asteraceae (Sunflower) | Purple |
| Liatris aspera | Rough Gayfeather, Tall Blazing Star | Asteraceae (Sunflower) | Purple |
| Liatris cymosa | Branched Gayfeather, Aggie-land Gayfeather, Branched Blazing Star | Asteraceae (Sunflower) | Purple |
| Liatris elegans | Pinkscale Gayfeather, Pinkscale Blazing Star | Asteraceae (Sunflower) | Purple |
| Liatris punctata (Liatris mucronata) |
Dotted Gayfeather, Dotted Blazing Star | Asteraceae (Sunflower) | Purple |
| Lindheimera texana | Texas Star, Texas Yellowstar | Asteraceae (Sunflower) | Yellow |
| Linum aristatum | Bristle Flax | Linaceae (Flax) | Yellow |
| Linum berlandieri (Linum rigidum var. berlandieri) |
Berlandier’s Yellow Flax, Bowl Flax | Linaceae (Flax) | Yellow |
| Linum hudsonioides | Texas Flax, Hudson Flax | Linaceae (Flax) | Yellow |
| Linum medium var. texanum | Stiff Yellow Flax, Sucker Flax | Linaceae (Flax) | Yellow |
| Linum pratense | Meadow Flax | Linaceae (Flax) | Blue |
| Linum rupestre | Rock Flax | Linaceae (Flax) | Yellow |
| Linum vernale | Chihuahuan Flax | Linaceae (Flax) | Orange |
| Lithospermum incisum | Fringed Puccoon | Boraginaceae (Forget-me-not) | Yellow |
| Lithospermum matamorense | Rough Stoneseed, Rough Gromwell | Boraginaceae (Forget-me-not) | White |
| Lobelia berlandieri | Berlandier's Lobelia | Campanulaceae (Bellflower) | Blue |
| Lobelia cardinalis | Cardinalflower | Campanulaceae (Bellflower) | Red |
| Lobelia reverchonii (Lobelia puberula var. pauciflora) |
Downy Lobelia, Reverchon's Lobelia | Campanulaceae (Bellflower) | Blue |
| Lonicera japonica | Japanese Honeysuckle | Caprifoliaceae (Honeysuckle) | White |
| Lonicera sempervirens | Coral Honeysuckle, Trumpet Honeysuckle | Caprifoliaceae (Honeysuckle) | Red |
| Ludwigia leptocarpa | Angle-stem Primrose-willow | Onagraceae (Honeysuckle) | Yellow |
| Ludwigia octovalvis | Mexican Primrose-willow, Water Primrose | Onagraceae (Honeysuckle) | Yellow |
| Lupinus havardii | Big Bend Bluebonnet, Chisos Bluebonnet | Fabaceae (Pea) | Blue |
| Lupinus subcarnosus | Texas Bluebonnet, Sandyland Bluebonnet | Fabaceae (Pea) | Blue |
| Lupinus texensis | Texas Bluebonnet | Fabaceae (Pea) | Blue |
| Lygodesmia texana | Skeleton Plant | Asteraceae (Sunflower) | Purple |
| Lysimachia arvensis (var. caerula) (Anagallis arvensis) |
Pimpernel | Primulaceae (Primrose) | Blue |
| SPECIES | COMMON NAME | FAMILY | COLOR |
| Machaeranthera tanacetifolia | Tansy-leaf Aster, Tahoka Daisy | Asteraceae (Sunflower) | Purple |
| Malvastrum coromandelianum | Common False Mallow, Three-lobe False Mallow | Malvaceae (Mallow) | Yellow |
| Malvaviscus arboreus var. drummondii | Turk's Cap, Wax Mallow | Malvaceae (Mallow) | Red |
| Malvella sagittifolia (Sida leprosa var. sagittifolia) |
Arrowleaf Mallow, Arrowleaf Scurfy Sida | Malvaceae (Mallow) | White |
| Marshallia caespitosa | Barbara's Buttons, Puff Balls | Asteraceae (Sunflower) | White |
| Matelea reticulata | Green Milkweed Vine, Pearl Milkweed Vine | Apocynaceae (Dogbane) | Green |
| Maurandella antirrhiniflora (Maurandya antirrhiniflora) |
Climbing Snapdragon, Snapdragon Vine, Roving Sailor | Plantaginaceae (Plantain) | Purple |
| Medicago lupulina | Black Medick | Fabacea (Pea) | Yellow |
| Medicago minima | Little Bur-clover | Fabacea (Pea) | Yellow |
| Melampodium leucanthum | Blackfoot Daisy, Plains Blackfoot | Asteraceae (Sunflower) | White |
| Melia azedarach | Chinaberry Tree | Meliaceae (Mahogany) | White |
| Melica nitens | Three-flower Melic, Three-flower Melicgrass | Poaceae (Grass) | Green |
| Melilotus albus | White Sweet Clover | Fabaceae (Pea) | White |
| Melilotus indicus | Annual Yellow Sweet Clover, Sour Clover, Alfalfilla | Fabaceae (Pea) | Yellow |
| Menodora heterophylla | Redbud, Low Menodora | Oleaceae (Olive) | Yellow |
| Menodora longiflora | Showy Menodora | Oleaceae (Olive) | Yellow |
| Menodora scabra | Rough Menodora | Oleaceae (Olive) | Yellow |
| Mentzelia decapetala | Ten-petal Blazingstar | Loasaceae (Stickleaf) | White |
| Mentzelia oligosperma | Stickleaf, Chickenthief | Loasaceae (Stickleaf) | Yellow |
| Mentzelia reverchonii | Prairie Stickleaf | Loasaceae (Stickleaf) | Yellow |
| Metatstelma barbigerum (Cynachum barbigerum) |
Bearded Swallow-wort | Apocynaceae (Dogbane) | White |
| Mikania scandens | Climbing Hempweed | Asteraceae (Sunflower) | White |
| Mimosa borealis | Fragrant Mimosa, Pink Mimosa | Fabaceae (Pea) | Pink |
| Mimosa emoryana | Emory Mimosa | Fabaceae (Pea) | Pink |
| Mimosa nuttallii | Nutall's Sensitive-briar, Catclaw Sensitive-briar | Fabaceae (Pea) | Pink |
| Mimosa roemeriana | Roemer's Mimosa, Sensitive-briar | Fabaceae (Pea) | Pink |
| Mimosa strigillosa | Puffball | Fabaceae (Pea) | Pink |
| Mimosa turneri | Turner Mimosa | Fabaceae (Pea) | Pink |
| Mimulus glabratus (Erythranthe glabrata) |
Round-leaf Monkeyflower | Phrymaceae (Lopseed) | Yellow |
| Minuartia drummondii (Arenaria drummondii Mononeuria nuttallii) |
Drummond’s Stitchwort, Sandwort | Caryophyllaceae (Pink) | White |
| Minuartia muscorum (Arenaria patula var. robusta Mononeuria muscorum) |
Dixie Stichwort | Caryophyllaceae (Pink) | White |
| Mirabilis albida | White Four O'clock | Nyctaginaceae (Four O'clock) | White |
| Mirabilis jalapa | Marvel of Peru, Common Four O'clock | Nyctaginaceae (Four O'clock) | Pink |
| Mirabilis linearis | Narrow-leaf Four O'clock | Nyctaginaceae (Four O'clock) | White |
| Mirabilis nyctaginea | Heartleaf Four O'clock | Nyctaginaceae (Four O'clock) | Pink |
| Mirabilis texensis (Mirabilis rotata) |
Texas Four O'clock | Nyctaginaceae (Four O'clock) | Pink |
| Modiola caroliniana | Carolina Bristle-mallow, Carolina Modiola | Malvaceae (Mallow) | Pink |
| Monarda citriodora | Lemon Beebalm, Purple Horsemint | Lamiaceae (Mint) | Purple |
| Monarda clinopodioides | Basil Beebalm | Lamiaceae (Mint) | White |
| Monarda punctata | Spotted Beebalm | Lamiaceae (Mint) | Yellow |
| SPECIES | COMMON NAME | FAMILY | COLOR |
| Nama dichotoma (Nama dichotomum) |
Wishbone Fiddleleaf | Boraginaceae (Forget-me-not) | Purple |
| Nama havardii | Havard Nama, Havard Fiddleleaf | Boraginaceae (Forget-me-not) | Pink |
| Nama hispida (Nama hispidum) |
Bristly Nama, Sand Bells | Boraginaceae (Forget-me-not) | Pink |
| Nama torynophyllum (Nama torynophylla) |
Mat Nama | Boraginaceae (Forget-me-not) | Pink |
| Nandina domestica | Heavenly Bamboo, Sacred Bamboo | Berberidaceae (Barberry) | White |
| Nemastylis geminiflora | Celestials | Iridaceae (Iris) | Blue |
| Nemophila phacelioides | Baby Blue-eyes | Hydrophyllaceae (Waterleaf) | Blue |
| Neptunia lutea | Yellow Puff, Yellow Sensitive-briar | Fabaceae (Pea) | Yellow |
| Neptunia pubescens | Tropical Puff | Fabaceae (Pea) | Yellow |
| Nerisyrenia camporum | Bicolor Mustard | Brassicaeae (Mustard) | White |
| Nicolletia edwardsii | Hole-in-the-sand Plant | Asteraceae (Sunflower) | White |
| Nicotiana glauca | Tree Tobacco | Solanaceae (Nightshade) | Yellow |
| Nicotiana obtusifolia | Desert Tobacco | Solanaceae (Nightshade) | White |
| Nicotiana repanda | Fiddleleaf Tobacco | Solanaceae (Nightshade) | White |
| Nolina texana | Texas Beargrass, Bunchgrass, Basket Grass, Sacahuista | Asparagaceae (Asparagus) | White |
| Nothoscordum bivalve | Crow Poison, False Garlic | Amaryllidaceae (Amaryllis) | White |
(Linaria canadensis) |
|||
| Nuttallanthus texanus (Linaria texana) |
Texas Toadflax | Plantaginaceae (Plantain) | Purple |
| Nyctaginia capitata | Devil's Bouquet, Scarlet Muskflower | Nyctaginaceae (Four O'clock) | Red |
| SPECIES | COMMON NAME | FAMILY | COLOR |
| Oenothera albicaulis | Whitest Evening Primrose, Prairie Evening Primrose | Onagraceae (Evening Primrose) | White |
| Oenothera berlandieri ssp. berlandieri (Calylophus drummondianus ssp. berlandieri) |
Square-bud Primrose, Berlandier’s Sundrops | Onagraceae (Evening Primrose) | Yellow |
| Oenothera berlandieri ssp. pinifolia (Calypholus berlandieri ssp. pinifolius) |
Square-bud Primrose, Berlandier’s Sundrops | Onagraceae (Evening Primrose) | Yellow |
| Oenothera boquillensis (Gaura boquillensis) |
Rio Grande Beeblossom, Boquillas Lizardtail | Onagraceae (Evening Primrose) | White |
| Oenothera brachycarpa | Short-fruit Evening Primrose | Onagraceae (Evening Primrose) | Yellow |
| Oenothera curtiflora (Gaura parviflora) |
Velvetweed, Velvet Butterfly-weed | Onagraceae (Evening Primrose) | Pink |
| Oenothera grandis (Oenothera laciniata var. grandis) |
Showy Evening Primrose | Onagraceae (Evening Primrose) | Yellow |
| Oenothera hartwegii (Calylophus hartwegii) |
Hartweg’s Sundrops | Onagraceae (Evening Primrose) | Yellow |
| Oenothera kunthiana | Kunth's Primrose | Onagraceae (Evening Primrose) | White |
| Oenothera laciniata | Cut-leaf Evening Primrose | Onagraceae (Evening Primrose) | Yellow |
| Oenothera lavandulifolia (Calylophus lavandulifolius) |
Lavender-leaf Sundrops, Lavender-leaf Primrose | Onagraceae (Evening Primrose) | Yellow |
| Oenothera lindheimeri (Gaura lindheimeri) |
White Gaura | Onagraceae (Evening Primrose) | White |
| Oenothera macrocarpa | Big-fruit Evening Primrose | Onagraceae (Evening Primrose) | Yellow |
| Oenothera patriciae (Gaura brachycarpa) |
Plains Beeblossom | Onagraceae (Evening Primrose) | White |
| Oenothera rhombipetala | Fourpoint Evening Primrose | Onagraceae (Evening Primrose) | Yellow |
| Oenothera speciosa | Showy Evening Primrose | Onagraceae (Evening Primrose) | Pink |
| Oenothera suffrutescens (Gaura coccinea, Gaura suffrutescens) |
Scarlet Gaura, Scarlet Beeblossom | Onagraceae (Evening Primrose) | Pink |
| Oenothera suffulta (Gaura suffulta) |
Kisses, Wild Honeysuckle | Onagraceae (Evening Primrose) | White |
| Oenothera triloba | Stemless Evening Primrose | Onagraceae (Evening Primrose) | Yellow |
| Oenothera tubicula (Calypholus tubicula) |
Texas Sundrops | Onagraceae (Evening Primrose) | Yellow |
| Oligomeris linifolia | Lineleaf Whitepuff | Resedaceae (Mignonette) | White/Green |
| Omphalodes aliena | Mexican Navelwort, Mexican Navelseed | Boraginaceae (Forget-me-not) | Blue |
| Onosmodium bejariense (Onosmodium molle) |
False Gromwell, Soft-hair Marbleseed | Boraginaceae (Forget-me-not) | White |
| Opuntia azurea var. parva | Big Bend Purplish Prickly Pear | Cactaceae (Cactus) | Yellow |
| Opuntia dulcis (Opuntia engelmanni var. dulcis, Opuntia lindheimeri var. dulcis) |
Sweet Prickly Pear | Cactaceae (Cactus) | Yellow |
| Opuntia engelmannii var. engelmannii | Engelmann's Prickly Pear, Cactus Apple | Cactaceae (Cactus) | Yellow |
| Opuntia engelmannii var. lindheimeri (Opuntia lindheimeri) |
Texas Prickly Pear | Cactaceae (Cactus) | Yellow |
| Opuntia macrorhiza | Plains Prickly Pear, Twist-spine Prickly Pear | Cactaceae (Cactus) | Yellow |
| Opuntia mackensenii var. mackensenii | Mackensen's Prickly Pear | Cactaceae (Cactus) | Yellow |
| Opuntia rufida | Blind Prickly Pear | Cactaceae (Cactus) | Yellow |
| Opuntia spinosibacca | Spiny-fruited Prickly Pear | Cactaceae (Cactus) | Yellow |
| Oxalis debilis | Pink Woodsorrel | Oxalidaceae (Wood Sorrel) | Pink |
| Oxalis dillenii | Yellow Woodsorrel | Oxalidaceae (Wood Sorrel) | Yellow |
| Oxalis drummondii | Drummond’s Woodsorrel | Oxalidaceae (Wood Sorrel) | Pink |
| SPECIES | COMMON NAME | FAMILY | COLOR |
| Packera millelobata (Senecio millelobatus) |
Unita Ragwort | Asteraceae (Sunflower) | Yellow |
| Packera obovata (Senecio obovatus) |
Golden Groundsel, Round-leaf Groundsel | Asteraceae (Sunflower) | Yellow |
| Packera tampicana (Senecio tampicanus, Senecio imparipinnatus) |
Great Plains Ragwort, Butterweed, Cut-leaf Groundsel | Asteraceae (Sunflower) | Yellow |
| Palafoxia callosa | Small Palafox | Asteraceae (Sunflower) | Pink |
| Palafoxia hookeriana | Sand Palafox | Asteraceae (Sunflower) | Pink |
| Papaver rhoeas | Corn Poppy, Flanders Poppy, Remembrance Poppy | Papaveraceae (Poppy) | Red |
| Papaver somniferum | Opium Poppy | Papaveraceae (Poppy) | Pink |
| Parietaria pensylvanica | Pennsylvania Pellitory | Urticaceae (Nettle) | Green |
| Parkinsonia aculeata | Mexican Paloverde, Paloverde, Jerusalem Thorn, Retama | Fabacea (Pea) | Yellow |
| Paronychia jamesii | James' Nailwort | Caryophyllacea (Pink) | Yellow |
| Parthenium confertum | Lyreleaf Parthenium, Gray's Feverfew | Asteraceae (Sunflower) | White |
| Parthenium hysterophorus | False Ragweed, Santa Maria Feverfew | Asteraceae (Sunflower) | White |
| Parthenium incanum | Mariola | Asteraceae (Sunflower) | White |
| Passiflora incarnata | Purple Passionflower, Maypop | Passifloraceae (Passionflower) | Blue |
| Pavonia lasiopetala | Rock Rose, Rose Mallow | Malvaceae (Mallow) | Pink |
| Pectis angustifolia | Lemonscent | Asteraceae (Sunflower) | Yellow |
| Pediomelum cuspidatum (Psoralea cuspidata) |
Large-bract Indian Breadroot, Tall-bread Scurf-pea | Fabaceae (Pea) | Blue/Purple |
| Pediomelum latestipulatum (Psoralea latestipulta) |
Texas Plains Indian Breadroot | Fabaceae (Pea) | Blue/Purple |
| Penstemon cobaea | Wild Foxglove | Plantaginaceae (Plantain) | Pink |
| Penstemon dasyphyllus | Cochise Beardtongue, Purple Penstemon | Plantaginaceae (Plantain) | Blue |
| Penstemon havardii | Big Bend Beardtongue, Havard Penstemon | Plantaginaceae (Plantain) | Red |
| Penstemon laxiflorus | Nodding Beardtongue, Loose-flowered Penstemon | Plantaginaceae (Plantain) | White |
| Penstemon triflorus | Scarlet Penstemon, Heller's Beardtongue | Plantaginaceae (Plantain) | Red/Pink |
| Penthorum sedoides | Ditch Stonecrop, Virginia Penthorum | Penthoraceae (Ditch Stonecrop) | Green |
| Perityle parryi | Heartleaf Rockdaisy, Parry's Rockdaisy | Asteraceae (Sunflower) | Yellow |
| Perityle vaseyi | Margined Rockdaisy | Asteraceae (Sunflower) | Yellow |
| Persea borbonia | Redbay | Lauraceae (Laurel) | White |
| Persicaria hydropiperoides (Polygonum hydropiperoides) |
Swamp Smartweed | Polygonaceae (Buckwheat) | White |
| Persicaria pensylvanica (Polygonum pensylvanicum) |
Pennsylvania Smartweed | Polygonaceae (Buckwheat) | Pink |
| Persicaria punctata (Polygonum punctatum) |
Dotted Smartweed, Water Smartweed | Polygonaceae (Buckwheat) | White |
| Petrorhagia dubia | Hairy Pink | Caryophyllaceae (Pink) | Pink |
| Phacelia coerulea (Phacelia caerulea) |
Skyblue Scorpionweed, Skyblue Phacelia | Hydrophyllaceae (Waterleaf) | Blue |
| Phacelia congesta | Blue-curls | Hydrophyllaceae (Waterleaf) | Blue |
| Phacelia hirsuta | Fuzzy Phacelia | Hydrophyllaceae (Waterleaf) | Blue |
| Phacelia integrifolia | Gypsum Phacelia | Hydrophyllaceae (Waterleaf) | Blue |
| Phacelia patuliflora | Sand Phacelia, Purple Phacelia | Hydrophyllaceae (Waterleaf) | Blue |
| Phacelia popei | Pope's Scorpionweed, Pope's Phacelia | Hydrophyllaceae (Waterleaf) | Blue |
| Phaseolus acutifolius | Tepary Bean | Fabaceae (Pea) | Purple |
| Phaseolus filiformis (Phaseolus wrightii) |
Slimjim Bean | Fabaceae (Pea) | Purple |
| Phemeranthus aurantiacus (Talinum aurantiacum) |
Orange Fameflower, Fameflower | Montiaceae (Miners Lettuce) | Orange |
| Phlox cuspidata | Pointed Phlox | Polemoniaceae (Phlox) | Pink |
| Phlox drummondii ssp. mcallisteri | McAllister's Phlox | Polemoniaceae (Phlox) | Pink |
| Phlox drummondii ssp. wilcoxiana | Wilcox's Phlox | Polemoniaceae (Phlox) | Red |
| Phlox glabriflora | Rio Grande Phlox | Polemoniaceae (Phlox) | Pink |
| Phlox mesoleuca | Thread-leaf Phlox | Polemoniaceae (Phlox) | Pink |
| Phlox pilosa | Prairie Phlox, Downy Phlox | Polemoniaceae (Phlox) | Pink |
| Phlox roemeriana | Golden-eye Phlox | Polemoniaceae (Phlox) | Pink |
| Phyla lanceolata | Lanceleaf Frog-fruit, Northern Frog-fruit | Verbenaceae (Verbena) | White |
| Phyla nodiflora | Turkey Tangle Frog-fruit, Texas Frog-fruit | Verbenaceae (Verbena) | White |
| Physalis angulata | Cut-leaf Groundcherry | Solanaceae (Nightshade) | Yellow |
| Physaria argyraea ssp. argyraea (Lesquerella argyraea) |
Silver Bladderpod | Brassicaceae (Mustard) | Yellow |
| Physaria densiflora (Lesquerella densiflora) |
Dense-flower Bladderpod, Low Bladderpod | Brassicaceae (Mustard) | Yellow |
| Physaria gordonii (Lesquerella gordonii) |
Gordon's Bladderpod | Brassicaceae (Mustard) | Yellow |
| Physaria gracilis (Lesquerella gracilis) |
Cloth-of-gold, Spreading Bladderpod | Brassicaceae (Mustard) | Yellow |
| Physaria purpurea (Lesquerella purpurea) |
White Bladderpod, Rose Bladderpod | Brassicaceae (Mustard) | White |
| Physaria recurvata (Lesquerella recurvata) |
Gaslight Bladderpod | Brassicaceae (Mustard) | Yellow |
| Physostegia angustifolia | Narrow-leaf False Dragonhead | Lamiaceae (Mint) | Purple |
| Phytolacca americana | American Pokeweed | Phytolaccaceae (Pokeweed) | White |
| Pinaropappus roseus | White Rock Lettuce, White Dandelion | Asteraceae (Sunflower) | White |
| Pityopsis graminifolia var. latifolia | Narrowleaf Silkgrass | Asteraceae (Sunflower) | Yellow |
| Plantago helleri | Heller’s Plantain | Plantaginaceae (Plantain) | White |
| Plantago lanceolata | Buckhorn Plantain, English Plantain, etc. | Plantaginaceae (Plantain) | White |
| Plantago patagonica | Wooly Plantain | Plantaginaceae (Plantain) | White |
| Plantago rhodosperma | Redseed Plantain | Plantaginaceae (Plantain) | White |
| Plantago wrightiana | Wright's Plantain | Plantaginaceae (Plantain) | White |
| Plectocephalus americanus | American Basketflower, American Star Thistle | Asteraceae (Sunflower) | Purple |
| Pluchea odorata | Sweetscent, Marsh Fleabane | Asteraceae (Sunflower) | Pink |
| Polanisia dodecandra | Clammyweed, Redwhisker Clammyweed | Cleomaceae (Cleome) | White |
| Polanisia uniglandulosa | Mexican Clammyweed | Cleomaceae (Cleome) | White |
| Polygala alba | White Milkwort | Polygalaceae (Milkwort) | White |
| Polypogon monspeliensis | Annual Rabbit's-foot Grass | Poaceae (Grass) | White |
| Polypremum procumbens | Juniper-leaf, Rustweed | Tetrachondraceae | White |
| Porophyllum scoparium | Shrubby Poreleaf, Trans-Pecos Poreleaf | Asteraceae (Sunflower) | Yellow |
| Portulaca pilosa | Kiss Me Quick, Shaggy Portulaca | Portulacaceae (Purslane) | Pink |
| Prosopis glandulosa var. glandulosa | Honey Mesquite | Fabaceae (Pea) | Yellow |
| Prunella vulgaris | Common Selfheal | Lamiaceae (Mint) | Purple |
| Prunus mexicana | Mexican Plum | Rosaceae (Rose) | White |
| Psathyrotopsis scaposa | Naked Turtleback, Naked Brittlestem | Asteraceae (Sunflower) | White |
| Pseudognaphalium canescens | Wright's Cudweed | Asteraceae (Sunflower) | White |
| Pseudognaphalium jaliscense | Jalisco Rabbit-tobacco | Asteraceae (Sunflower) | White |
| Pseudognaphalium obtusifolium | Rabbit-tobacco, Sweet Everlasting | Asteraceae (Sunflower) | White |
| Psilactis asteroides (Machaeranthera boltoniae) | New Mexico Tansyaster | Asteraceae (Sunflower) | Purple |
| Psilotrophe tagetina | Wooly Paperflower | Asteraceae (Sunflower) | Yellow |
| Psilotrophe villosa (Psilotrophe tagetina var. cerifera) |
Wooly Paperflower, Plains Paperflower | Asteraceae (Sunflower) | Yellow |
| Ptelea trifoliata | Wafer Ash, Hoptree | Rutaceae (Rue) | White |
| Pyrrhopappus carolinianus | Carolina False Dandelion, Carolina Desert Chicory | Asteraceae (Sunflower) | Yellow |
| Pyrrhopappus pauciflorus (Pyrrhopappus multicaulis) |
Texas Dandelion | Asteraceae (Sunflower) | Yellow |
| SPECIES | COMMON NAME | FAMILY | COLOR |
| Quincula lobata (Physalis lobata) |
Chinese Lantern, Purple Groundcherry | Solanaceae (Nightshade) | Purple |
| Ranunculus macranthes | Large Buttercup | Ranunculaceae (Buttercup) | Yellow |
| Ranunculus sceleratus | Cursed Crowfoot, Celeary-leaf Buttercup | Ranunculaceae (Buttercup) | Yellow |
| Rapistrum rugosum | Bastard Cabbage, Annual Bastardcabbage | Brassicaceae (Mustard) | Yellow |
| Ratibida columnifera (Ratibida columnaris) |
Mexican Hat, Prairie Coneflower | Asteraceae (Sunflower) | Yellow |
| Rhus microphylla | Littleleaf Sumac, Desert Sumac | Anacardiaceae (Sumac) | White |
| Rhynchosia latifolia | Prairie Snoutbean, Broadleaf Snoutbean | Fabaceae (Pea) | Yellow |
| Rhynchosida physocalyx Sida physocalyx |
Bladderpod Sida, Beaked Sida | Malvaceae (Mallow) | Yellow |
| Rhynchospora colorata (Dichromena colorata) |
White-top Sedge, Starrush Whitetop, Narrow-leaf Whitetop | Cyperaceae (Sedge) | White |
| Richardia brasiliensis | Tropical Mexican Clover | Rubiaceae (Madder) | White |
| Rivina humilis | Pigeon-berry, Rougeplant | Phytolaccaceae (Pokeweed) | Pink |
| Rosa bracteata | Macartney Rose | Rosaceae (Rose) | White |
| Rubus trivialis | Southern Dewberry | Rosaceae (Rose) | White |
| Rudbeckia hirta | Brown-eyed Susuan, Black-eyed Susan | Asteraceae (Sunflower) | Yellow |
| Rudbeckia maxima | Giant Coneflower, Great Coneflower | Asteraceae (Sunflower) | Yellow |
| Ruellia caroliniensis | Carolina Wild Petunia | Acanthaceae (Acanthus) | Purple |
| Ruellia humilis | Fringeleaf Wild Petunia, Low Ruellia | Acanthaceae (Acanthus) | Purple |
| Ruellia nudiflora | Wild Petunia | Acanthaceae (Acanthaus) | Blue |
| Ruellia parryi | Parry's Wild Petunia | Acanthaceae (Acanthaus) | Purple |
| Ruellia pedunculata | Stalked Wild Petunia | Acanthaceae (Acanthaus) | Purple |
| Rumex altissimus | Pale Dock, Smooth Dock | Polygonaceae (Buckwheat) | Green |
| Rumex crispus | Curly Dock, Yellow Dock | Polygonaceae (Buckwheat) | White/Green |
| Rumex hastatulus | Heartwing Sorrel | Polygonaceae (Buckwheat) | White/Green |
| Rumex hymenosepalus | Canaigre | Polygonaceae (Buckwheat) | White/Green |
| Rumex pulcher | Fiddle Dock | Polygonaceae (Buckwheat) | Green |
| SPECIES | COMMON NAME | FAMILY | COLOR |
| Sabal minor | Palmetto, Dwarf | Arecaceae (Palm) | White |
| Sabatia campestris | Meadow Pink, Texas Star | Gentianaceae (Gentian) | Pink |
| Salsola tragus | Russian Thistle, Tumbleweed | Amaranthaceae (Amaranth) | White |
| Salvia azurea | Blue Sage, Pitcher Sage | Lamiaceae (Mint) | Blue |
| Salvia ballotiflora | Shrubby Blue Sage | Lamiaceae (Mint) | Blue |
| Salvia coccinea | Tropical Sage, Blood Sage | Lamiaceae (Mint) | Red |
| Salvia engelmannii | Engelmann's Sage | Lamiaceae (Mint) | Blue |
| Salvia farinacea | Mealycup Sage, Mealy Blue Sage | Lamiaceae (Mint) | Blue |
| Salvia greggii | Autumn Sage | Lamiaceae (Mint) | Pink |
| Salvia lyrata | Lyre-leaf Sage | Lamiaceae (Mint) | Blue |
| Salvia penstemonoides | Big Red Sage | Lamiaceae (Mint) | Red |
| Salvia reflexa | Lance-leaf Sage | Lamiaceae (Mint) | Blue |
| Salvia regla | Mountain Sage | Lamiaceae (Mint) | Red |
| Salvia roemeriana | Cedar Sage | Lamiaceae (Mint) | Red |
| Salvia texana | Texas Sage, Blue Sage | Lamiaceae (Mint) | Blue |
| Samolus ebracteatus | Limewater Brookweed, Bractless Brookweed | Primulaceae (Primrose) | White |
| Sanicula canadensis | Canadian Black-snakeroot, Canada Sanicle | Apiaceae (Parsley) | White |
| Sarracenia alata | Pitcher Plant, Yellow Trumpets | Sarraceniaceae (Pitcher Plant) | Yellow |
| Scutellaria drummondii | Drummond’s Skullcap | Lamiaceae (Mint) | Blue |
| Scutellaria ovata | Heartleaf Skullcap | Lamiaceae (Mint) | Blue |
| Sedum nuttallii (Sedum nuttallianum) | Yellow Stonecrop | Crassulaceae (Stonecrop) | Yellow |
| Selaginella lepidophylla | Flower of Stone, Resurrection Plant | Selaginellaceae (Spikemoss) | White |
| Senegalia berlandieri (Acacia berlandieri) | Guajillo, Berlandier's Acacia | Fabaceae (Pea) | White |
| Senegalia greggii (Acacia greggii) |
Catclaw Acacia | Fabaceae (Pea) | White |
| Senecio ampullaceus | Texas Groundsel, Ragwort | Asteraceae (Sunflower) | Yellow |
| Senna bauhinioides (Cassia bauhinioides) |
Twinleaf Senna | Fabaceae (Pea) | Yellow |
| Senna durangensis (Cassia durangensis) |
Durango Senna | Fabaceae (Pea) | Yellow |
| Senna lindheimeriana (Cassia lindheimeriana) |
Velvet-leaf Senna | Fabaceae (Pea) | Yellow |
| Senna roemeriana (Cassia roemeriana) |
Two-leaf Senna | Fabaceae | Yellow |
| Sesbania herbacea (Sesbania macrocarpa) |
Bigpod Sesbania, Coffeeweed, Peatree | Fabaceae | Yellow |
| Sherardia arvensis | Field Madder | Rubiaceae (Madder) | Pink |
| Sida abutifolia (Sida filicaulis) |
Spreading Fanpetals | Malvaceae (Mallow) | Yellow |
| Sida ciliaris | Bracted Fanpetals, Sida | Malvaceae Malvaceae (Mallow) | Red |
| Sida mexicana | New Mexico Fanpetals, New Mexico Sida | Malvaceae Malvaceae (Mallow) | Orange |
| Silene antirrhina | Sleepy Catchfly, Sleepy Silene | Caryophyllaceae (Pink) | Pink |
| Silene gallica | Windmill Catchfly | Caryophyllaceae (Pink) | Pink |
| Silene laciniata | Cardinal Catchfly | Caryophyllaceae (Pink) | Red |
| Silphium asteriscus var. asteriscus | Starry Rosinweed | Asteraceae (Sunflower) | Yellow |
| Silphium radula var. radula (Silphium simpsonii var. wrightii, Silphium reverchonii) |
Rough Rosinweed, Simpson's Rosinweed, Reverchon's Rosinweed | Asteraceae (Sunflower) | Yellow |
| Sisyrinchium pruinosum | Narrow-leaf Blue-eyed Grass | Iridacea (Iris) | Blue |
| Sisyrinchium rosulatum | Annual Bue-eyed Grass | Iridacea (Iris) | White |
| Smilax bona-nox | Saw Greenbrier, Catbrier | Smilacacea (Catbrier) | Green |
| Solanum dimidiatum | Nightshade, Western Horsenettle | Solanaceae (Nightshade) | Purple |
| Solanum elaeagnifolium | Silverleaf Nightshade | Solanaceae (Nightshade) | Purple |
| Solanum rostratum | Buffalobur Nightshade, Buffalo bur | Solanaceae (Nightshade) | Yellow |
| Solanum ptychanthum | West Indian Nightshade, Eastern Black Nightshade | Solanaceae (Nightshade) | White |
| Solanum triquetrum | Texas Nightshade | Solanaceae (Nightshade) | White |
| Solidago altissima | Tall Goldenrod | Asteraceae (Sunflower) | Yellow |
| Solidago nemoralis | Gray Goldenrod, Prairie Goldenrod | Asteraceae (Sunflower) | Yellow |
| Solidago petiolaris | Downy Goldenrod, Ragged Goldenrod | Asteraceae (Sunflower) | Yellow |
| Solidago radula | Western Rough Goldenrod | Asteraceae (Sunflower) | Yellow |
| Sonchus asper | Spiny Sow-thistle | Asteraceae (Sunflower) | Yellow |
| Sphaeralcea angustifolia | Narrow-leaf Globemallow | Malvaceae (Mallow) | Pink |
| Sphaeralcea coccinea | Caliche Globemallow, Scarlet Globemallow | Malvaceae (Mallow) | Orange |
| Sphaeralcea hastulata | Spear Globemallow | Malvaceae (Mallow) | Orange |
| Spiranthes lacera var. gracilis | Southern Slender Lady's Tresses | Orchidaceae (Orchid) | White |
| Spiranthes magnicamporum | Great Plains Lady's Tresses | Orchidaceae (Orchid) | White |
| Spiranthes vernalis | Spring Lady's Tresses | Orchidaceae (Orchid) | White |
| Stachys crenata | Mouse's Ear, Shade Betony | Lamiaceae (Mint) | Pink |
| Stemodia coahuilensis (Leucospora coahuilensis) |
Coahuila Twintip | Plantaginaceae (Plantain) | Purple |
| Stemodia lanata | Gray Woolly Twintip, Woolly Stemodia | Plantaginaceae (Plantain) | Purple |
| Stenandrium barbatum | Early Shaggytuft, Shaggy Stenandrium | Acanthaceae (Acanthus) | Pink |
| Stenaria nigricans var. nigricans (Hedyotis nigricans var. nigricans) (Houstonia nigricans var. nigricans) |
Diamondflowers, Baby's Breath, Bluets | Rubiaceae (Madder) | White |
| Stephanomeria pauciflore | Brown-plume Wirelettuce, Few-flower Wirelettuce | Asteraceae (Sunflower) | Pink |
| Stillingia sylvatica | Queen's Delight | Euphorbiaceae (Spurge) | Green |
| Stillingia texana | Texas Toothleaf, Queen's Delight | Euphorbiaceae (Spurge) | Green |
| Streptanthus petiolaris | Brazos Rockcress, Brazos Jewelflower | Brassicaceae (Mustard) | White |
| Stylosanthes biflora | Pencilflower, Sidebeak Pencilflower | Fabaceae (Pea) | Yellow |
| Symphyotrichum drummondii var. texanum (Aster texanus) |
Texas Aster, Drummond's Aster | Asteraceae (Sunflower) | White |
| Symphyotrichum dumosum var. dumosum (Aster dumosus var. dumosus) |
Rice Button Aster | Asteraceae (Sunflower) | White |
| Symphyotrichum ericoides var. ericoides (Aster ericoides) |
White Heath Aster | Asteraceae (Sunflower) | White |
| Symphyotrichum lanceolatum ssp. lanceolatum (Aster lanceolatus ssp. lanceolatus) |
White Panicle Aster | Asteraceae (Sunflower) | White |
| Symphyotrichum oblongifolium (Aster oblongifolius) |
Aromatic Aster | Asteraceae (Sunflower) | Purple |
| Symphyotrichum patens var. patens (Aster patens) |
Late Purple Aster | Asteraceae (Sunflower) | Purple |
| Symphyotrichum pratense (Aster pratensis) |
Barrens Silky Aster, Meadow Aster | Asteraceae (Sunflower) | Purple |
| Symphyotrichum subulatum var. ligulatum (Symphyotrichum divaricatum, Aster subulatus) |
Southern Annual Saltmarsh Aster, Hierba del Marrano | Asteraceae (Sunflower) | White |
| SPECIES | COMMON NAME | FAMILY | COLOR |
| Tamarix ramosissima | Salt Cedar | Tamaricaceae (Tamarisk) | Pink |
| Tecoma stans | Esperanza, Yellow Bells | Bignoniaceae (Trumpet-Creeper) | Yellow |
| Tephrosia lindheimeri | Hoary Pea | Fabaceae (Pea) | Pink |
| Tephrosia onobrychoides | Multi-bloom Hoary Pea | Fabaceae (Pea) | White |
| Tetragonotheca texana | Squarebud Daisy, Nerve-ray | Asteraceae (Sunflower) | Yellow |
| Tetraneuris linearifolia var. linearifolia | Slender-leaf Bitterweed, Fine-leaf Four-nerved Daisy | Asteraceae (Sunflower) | Yellow |
| Tetraneuris scaposa var. scaposa | Four-nerve Daisy, Bitterweed, Plains Yellow Daisy | Asteraceae (Sunflower) | Yellow |
| Teucrium canadense | American Germander, Canada Germander, Wood Sage | Lamiaceae (Mint) | Pink |
| Teucrium cubense | Small Coastal Germander, Cut-leaf Germander | Lamiaceae (Mint) | White |
| Thamnsosma texana | Dutchman's Breeches, Desert Rue | Rutaceae (Rue) | Yellow |
| Thelesperma filifolium | Greenthread | Asteraceae (Sunflower) | Yellow |
| Thelesperma megapotamicum | Hopi Tea Greenthread | Asteraceae (Sunflower) | Yellow |
| Thelesperma simplicifolium | Edwards Plateau Greenthread, Navajo Tea | Asteraceae (Sunflower) | Yellow |
| Thelocactus bicolor var. bicolor | Glory of Texas Cactus | Cactaceae (Cactus) | Pink |
| Thelocactus setispinus (Hamatocactus bicolor, Ferocactus setispinus, Echinocactus setispinus) |
Fishhook Cactus, Miniature Barrel Cactus, Twisted-rib Cactus | Cactaceae (Cactus) | Yellow |
| Thymophylla acerosa | Pricklyleaf Dogweed, Texas Dogweed | Asteraceae (Sunflower) | Yellow |
| Thymophylla pentachaeta (Dyssodia pentachaeta) |
Common Dogweed, Fiveneedle Pricklyleaf, Parralena | Asteraceae (Sunflower) | Yellow |
| Tidestromia lanuginosa | Woolly Tidestromia, Honeymat | Amaranthaceae (Amaranth) | Yellow |
| Tinantia anomala | False Dayflower | Commelinaceae (Spiderwort) | Blue |
| Tiquilia greggii (Coldenia greggii) |
Plumed Crinklemat | Boraginaceae (Forget-me-not) | Pink |
| Tiquilia hispidissima (Coldenia hispidissima) |
Hairy Crinklemat | Boraginaceae (Forget-me-not) | Pink |
| Tiquilia mexicana (Coldenia mexicana) |
Mexican Crinklemat | Boraginaceae (Forget-me-not) | Pink |
| Torilis arvensis | Hedge Parsley, Spreading Hedge Parsley | Apiaceae (Parsley) | White |
| Toxicodendron pubescens (Rhus toxicodendron var. eximia) |
Atlantic Poison Oak, Eastern Poison Oak | Anacardiaceae (Sumac) | White |
| Tradescantia gigantea | Giant Spiderwort | Commelinaceae (Spiderwort) | Blue/Purple |
| Tradescantia hirsutiflora | Hairy-flower Spiderwort | Commelinaceae (Spiderwort) | Blue/Purple |
| Tradescantia humilis | Texas Spiderwort | Commelinaceae (Spiderwort) | Blue |
| Tradescantia occidentalis | Prairie Spiderwort | Commelinaceae (Spiderwort) | Blue/Purple |
| Tradescantia pedicellata | Granite Spiderwort, Edwards Plateau Spiderwort | Commelinaceae (Spiderwort) | Blue/Purple |
| Tradescantia subacaulis (Tradescantia texana) |
Stemless Spiderwort | Commelinaceae (Spiderwort) | Blue/Purple |
| Tragopogon dubius | Yellow Salsify, Goatsbeard | Asteraceae (Sunflower) | Yellow |
| Trepocarpus aethusae | Whitenymph | Apiaceae (Parsley) | White |
| Triadica sebifera | Chinese Tallow, Popcorn Tree | Euphorbiaceae (Spurge) | Green |
| Tribulus terrestris | Puncture Vine, Goathead | Zygophyllaceae (Caltrop) | Yellow |
| Trichloris crinita (Leptochloa crinita) |
False Rhodes Grass | Poaceae (Grass) | White |
| Trichostema dichotomum | Blue Curls, Forked Blue Curls | Lamiaceae (Mint) | Blue |
| Trifolium campestre | Field Clover, Low Hop Clover, Hop Trefoil | Fabaceae (Pea) | Yellow |
| Trifolium incarnatum | Crimson Clover | Fabaceae (Pea) | Red |
| Trifolium resupinatum | Persian Clover, Reversed Clover | Fabaceae (Pea) | Pink |
| Triodanis perfoliate ssp. perfoliata |
Clasping-leaf Venus Looking-glass | Campanulaceae (Bellflower) | Blue |
| Trixis californica | American Threefold | Asteraceae (Sunflower) | Yellow |
| Typha domingensis | Southern Cattail | Typhaceae (Cattail) | Yellow |
| SPECIES | COMMON NAME | FAMILY | COLOR |
| Ungnadia speciosa | Mexican Buck-eye | Sapindaceae (Soapberry) | Pink |
| Vaccinium arboreum | Farkleberry, Sparkleberry | Ericaceae (Heath) | White |
| Vachellia constricta (Acacia constricta) |
Whitethorn Acacia | Fabaceae (Pea) | Yellow |
| Vachellia farnesiana (Acacia farnesiana) |
Huisache, Sweet Acacia | Fabaceae (Pea) | Yellow |
| Vachellia rigidula (Acacia rigidula) |
Blackbrush Acacia | Fabaceae (Pea) | Yellow |
| Vachellia vernicosa (Acacia neovernicosa) |
Viscid Acacia | Fabaceae (Pea) | Yellow |
| Valerianella amarella | Hairy Cornsalad | Valerianaceae (Valerian) | White |
| Valerianella locusta | Common Cornsalad, Lamb's Lettuce | Valerianaceae (Valerian) | White |
| Valerianella radiata | Beaked Cornsalad | Valerianaceae (Valerian) | White |
| Verbena brasiliensis | Brazilian Vervain | Verbenaceae (Verbena) | Purple |
| Verbena canescens | Gray Vervain | Verbenaceae (Verbena) | Purple |
| Verbena halei | Texas Vervain, Texas Verbena, Slender Verbena | Verbenaceae (Verbena) | Purple |
| Verbena neomexicana var. hirtella | Hillside Vervain, New Mexico Verbena | Verbenaceae (Verbena) | Purple |
| Verbena rigida | Tuberous Vervain, Slender Vervain | Verbenaceae (Verbena) | Purple |
| Verbena plicata | Fanleaf Vervain | Verbenaceae (Verbena) | Purple |
| Verbena xutha | Gulf Vervain | Verbenaceae (Verbena) | Purple |
| Verbesina encelioides | Golden Crownbeard, Cowpen Daisy | Asteraceae (Sunflower) | Yellow |
| Verbesina virginica | Frostweed, White Crownbeard | Asteraceae (Sunflower) | White |
| Vernonia lindheimeri | Woolly Ironweed, Lindheimer's Ironweed | Asteraceae (Sunflower) | Purple |
| Veronica anagallis-aquatica | Water Speedwell | Plantaginaceae (Plantain) | Blue |
| Veronica persica | Bird-eye Speedwell, Winter Speedwell | Plantaginaceae (Plantain) | Blue |
| Viburnum rufidulum | Rusty Blackhaw, Rusty Viburnum | Adoxaceae (Moschatel) | White |
| Vicia ludoviciana | Louisiana Vetch, Deer Pea Vetch | Fabaceae (Pea) | Blue |
| Vicia villosa | Winter Vetch, Hairy Vetch | Fabaceae (Pea) | Blue |
| Viguiera dentata | Plateau Goldeneye, Sunflower Goldeneye | Asteraceae (Sunflower) | Yellow |
| Viguiera stenoloba | Skeleton-leaf Goldeneye, Resinweed | Asteraceae (Sunflower) | Yellow |
| Viola missouriensis | Missouri Violet | Violaceae (Violet) | Purple |
| Vitex agnus-castus | Lilac Chastetree | Lamiaceae (Mint) | Purple |
| Vitis mustangensis | Mustang Grape | Vitaceae (Grape) | White/Green |
| SPECIES | COMMON NAME | FAMILY | COLOR |
| Warnockia scutellarioides | Prairie Brazosmint, Prairie Brazoria | Lamiaceae (Mint) | Pink |
| Wedelia acapulcensis var. hispida (Zexmenia hispida) (Wedelia hispida) |
Hairy Wedelia, Zexmenia | Asteraceae (Sunflower) | Yellow |
| Wisteria frutescens | American Wisteria, Texas Wisteria | Fabaceae (Pea) | Purple |
| Xanthisma spinulosum var. chihuahuanum Machaeranthera pinnatifida var. chihuahuana |
Chihuahua Tansyaster | Asteraceae (Sunflower) | Yellow |
| Xanthisma spinulosum var. spinulosum Machaeranthera texensis |
Lacy Tansyaster, Spiny Goldenweed | Asteraceae (Sunflower) | Yellow |
| Xanthisma texanum var. drummondii | Drummond's Sleepy-daisy | Asteraceae (Sunflower) | Yellow |
| Xylorhiza wrightii (Machaeranthera wrightii) |
Terlingia Aster, Big Bend Woodyaster | Asteraceae (Sunflower) | Blue |
| Youngia japonica | Oriental False Hawksbeard | Asteraceae (Sunflower) | Yellow |
| Yucca arkansana | Arkansas Yucca | Asparagaceae (Asparagus) | White |
| Yucca elata | Soaptree Yucca | Asparagaceae (Asparagus) | White |
| Yucca faxoniana | Giant Dagger Yucca | Asparagaceae (Asparagus) | White |
| Yucca rupicola | Texas Yucca, Twisted-leaf Yucca | Asparagaceae (Asparagus) | White |
| Yucca thompsoniana | Thompson Yucca, Beaked Yucca | Asparagaceae (Asparagus) | White |
| Yucca treculeana (Yucca torreyi) |
Spanish Dagger Yucca, Don Quixote's Lace | Asparagaceae (Asparagus) | White |
| Zeltnera beyrichii (Centaurium beyrichii) |
Mountain Pink, Rock Centaury | Gentianaceae (Gentian) | Pink |
| Zeltnera calycosa (Centaurium calycosum) |
Rosita | Gentianaceae (Gentian) | Pink |
| Zeltnera glandulifera (Centaurium glanduliferum) |
Sticky Centaury, Glandular Mountain Pink | Gentianaceae (Gentian) | Pink |
| Zephyranthes chlorosolen (Cooperia drummondii) |
Evening Rain-lily | Amaryllidaceae (Amaryllis) | White |
| Zephyranthes drummondii (Cooperia pedunculata) |
Hill Country Rain-lily, Prairie Lily | Amaryllidaceae (Amaryllis) | White |
| Zinnia acerosa | Desert Zinnia, Dwarf Zinnia | Asteraceae (Sunflower) | White |
| Zinnia anomala | Short-ray Zinnia | Asteraceae (Sunflower) | Orange |
| Zinnia grandiflora | Texas Zinnia, Plains Zinnia | Asteraceae (Sunflower) | Yellow |
| Zornia bracteata | Viperina | Fabaceae (Pea) | Yellow |
Banner photo of Castilleja indivisa and Lupinus ssp. taken along FM 1323 north of Johnson City, Blanco County
© Tom Lebsack 2024