Trouble identifying a weed?
For additional assistance identifying weeds, contact Dr. Kevin Braldly, State Extension Weed Scientist (bradleyke@missouri.edu).
| Common Name | Latin Name |
|---|---|
| Ajuga | see Bugleweed |
| Allegheny Blackberry | see Smooth Blackberry |
| Alligatorweed | Alternanthera philoxeroides |
| American Bellflower | Campanulastrum americanum |
| American Burnweed | see Fireweed |
| American Elder | see Elderberry |
| American Lotus | Nelumbo lutea |
| American Speedwell | Veronica americana |
| American Water Plantain | Alisma subcordatum |
| American Water Willow | see Water Willow |
| American brooklime | see American Speedwell |
| Amur honeysuckle | see Bush Honeysuckle |
| Annual Bluegrass | Poa annua |
| Annual Fleabane | Erigeron annuus |
| Annual Jewgrass | see Japanese Stiltgrass |
| Annual Marshelder | Iva annua |
| Annual Rye | see Annual Ryegrass |
| Annual Ryegrass | Lolium multiflorum |
| Annual Sowthistle | Sonchus oleraceus |
| Annual Wormwood | Artemisia annua |
| Apple-of-Peru | Nicandra physalodes |
| Arabidopsis | see Mouse-ear Cress |
| Arrow-leaved Tearthumb | Polygonum sagittatum |
| Arrowleaf Knotweed | see Arrow-leaved Tearthumb |
| Arrowleaf Sida | Sida rhombifolia |
| Arrowleaf Smartweed | see Arrow-leaved Tearthumb |
| Arrowvine | see Arrow-leaved Tearthumb |
| Asian Dayflower | see Marsh Dayflower |
| Asian Spiderwort | see Marsh Dayflower |
| Asiatic Dayflower | Commelina communis |
| Aunt Lucy | Ellisia nyclelea |
| Autumn Clematis | see Virgin's Bower |
| Autumn Olive | Elaeagnus umbellata |
| Bachelors Buttons | see Cornflower |
| Baldwins Ironweed | Vernonia baldwinii |
| Balloonvine | Cardiospermum halicacabum |
| Barnyardgrass | Echinochloa crus-galli |
| Basketgrass | see Japanese Stiltgrass |
| Bathurst Bur | see Spiny Cocklebur |
| Beaked Nightshade | see Buffalobur |
| Bear's Foot | see Yellow-flowered Leaf-cup |
| Bear-grass | see Yucca |
| Bearded Sprangletop | Leptochloa fusca ssp. fascicularis |
| Bedstraw | Galium aparine |
| Bee-balm | Monarda fistulosa |
| Beef-steak Plant | see Perilla Mint |
| Benghal Dayflower | Commelina benghalensis |
| Bermudagrass | Cynodon dactylon |
| Bigroot Morningglory | Ipomoea pandurata |
| Birds Foot Violet | Viola pedata |
| Birdsfoot Trefoil | Lotus corniculatus |
| Bitter Sneezeweed | Helenium amarum |
| Bittersweet Nightshade | Solanum dulcamara |
| Black Locust | Robinia pseudoacacia |
| Black Medic | Medicago lupulina |
| Black Oak | Quercus velutina |
| Blackjack Oak | Quercus marilandica |
| Blackseed Plantain | Plantago rugelii |
| Bladder Campion | Silene vulgaris |
| Bladderworts | Utricularia spp. |
| Bloodroot | Sanguinaria canadensis |
| Bloom Fell | see Birdsfoot Trefoil |
| Blue Phlox | Phlox divaricata |
| Blue Vervain | Verbena hastata |
| Blue-Bottles | see Starch Grapehyacinth |
| Bluebell | see Virginia Bluebells |
| Blueweed | see Viper's Bugloss |
| Bouncing-bet | Saponaria officinalis |
| Brazilian Elodea | Egeria densa |
| Brazilian Waterweed | see Brazilian Elodea |
| Bristly Cattail Sedge | see Frank's Sedge |
| Bristly Greenbrier | Smilax hispida |
| Brittle Naiad | see Slender Naiad |
| Brittleleaf | see Slender Naiad |
| Broadleaf Arrowhead | see Midwestern Arrowhead |
| Broadleaf Dock | Rumex obtusifolius |
| Broadleaf Pepperweed | see Perennial Pepperweed |
| Broadleaf Plantain | Plantago major |
| Broadleaf Signalgrass | Brachiaria platyphylla |
| Broomsedge | Andropogon virginicus |
| Brown Mustard | see Indian Mustard |
| Browntop Millet | Brachiaria ramosa |
| Buckbrush | Symphoricarpos orbiculatus |
| Buckhorn Plantain | Plantago lanceolata |
| Buffalobur | Solanum rostratum |
| Bugleweed | Ajuga reptans |
| Bulbous Buttercup | Ranunculus bulbosus |
| Bulbous Oatgrass | Arrhenatherum elatius var. bulbosa |
| Bulbous Tall Oatgrass | see Bulbous Oatgrass |
| Bull Thistle | Cirsium vulgare |
| Bullbrier | see Greenbrier |
| Burcucumber | Sicyos angulatus |
| Bush Honeysuckle | Lonicera maackii |
| Bushy Wallflower | Erysimum repandum |
| Butterfly Milkweed | Asclepias tuberosa |
| Butterflyweed | see Butterfly Milkweed |
| Butterweed | see Cressleaf Groundsel |
| Calamint | Calamintha nepeta |
| Calepina | Calepina irregularis |
| Caltrop | see Puncturevine |
| Canada Onion | see Wild Onion |
| Canada Thistle | Cirsium arvense |
| Canadian Garlic | see Wild Onion |
| Cancer weed | see Lyreleaf Sage |
| Cancer-root | see Squaw-root |
| Caper Spurge | Euphorbia lathyris |
| Carolina False Dandelion | Pyrrhopappus carolinianus |
| Carolina Foxtail | Alopecurus carolinianus |
| Carolina Geranium | Geranium carolinianum |
| Carpet Bentgrass | see Creeping Bentgrass |
| Carpet Bugle | see Bugleweed |
| Carpetweed | Mollugo verticillata |
| Castor Bean | Ricinus communis |
| Castor Oil Plant | see Castor Bean |
| Cat'S Clover | see Birdsfoot Trefoil |
| Cat's claw | see Sensitive Brier |
| Catbrier | see Bristly Greenbrier |
| Catbrier | see Greenbrier |
| Catmint | see Catnip |
| Catnip | Nepeta cataria |
| Cattails | Nympha spp. |
| Catwort | see Catnip |
| Celery-Leaf Buttercup | see Crowfoot Buttercup |
| Chara | Chara spp. |
| Cheat | Bromus secalinus |
| Chicory | Cichorium intybus |
| Chinese Fountain Grass | Pennisetum alopecuroides |
| Chinese Lantern | see Apple-of-Peru |
| Chinese Yam | Dioscorea batatas |
| Cinnamon Vine | see Chinese Yam |
| Clammy Groundcherry | Physallis heterophylla |
| Clasping Milkweed | Asclepias amplexicaule |
| Cleavers | see Bedstraw |
| Climbing False Buckwheat | Polygonum scandens |
| Climbing Rose | see Prairie Rose |
| Cockspur Thorn | Crataegus crus-galli |
| Coco | see Purple Nutsedge |
| Coffee Senna | Cassia occidentalis |
| Common Balm | see Bee-balm |
| Common Beggar-ticks | Bidens frondosa |
| Common Beggarticks | see Common Beggar-ticks |
| Common Blackberry | see Smooth Blackberry |
| Common Blue Violet | Viola papilionacea |
| Common Bugleweed | see Bugleweed |
| Common Burdock | Arctium minus |
| Common Buttonweed | see Poorjoe |
| Common Catsear | Hypochoeris radicata |
| Common Chickweed | Stellaria media |
| Common Cocklebur | Xanthium strumarium |
| Common Dayflower | see Asiatic Dayflower |
| Common Dewberry | see Northern Dewberry |
| Common Duckweeds | see Duckweeds |
| Common Eveningprimrose | Oenothera biennis |
| Common Greenbrier | see Roundleaf Greenbrier |
| Common Groundsel | Senecio vulgaris |
| Common Hop Sedge | see Hop Sedge |
| Common Lambsquarters | Chenopodium album |
| Common Lespedeza | Lespedeza striata |
| Common Mallow | Malva neglecta |
| Common Milkweed | Asclepias syriaca |
| Common Mullein | Verbascum thapsus |
| Common Pokeweed | Phytolacca americana |
| Common Purslane | Portulaca oleracea |
| Common Ragweed | Ambrosia artemisiifolia |
| Common Reed | Phragmites australis |
| Common Saint Johnswort | see Saint Johnswort |
| Common Sunflower | Helianthus annuus |
| Common Tansy | Tanacetum vulgare |
| Common Teasel | Dipsacus fullonum |
| Common Toadflax | Linaria canadensis |
| Common Unicorn Plant | see Devil's Claw |
| Common Venus Looking-glass | Triodanis perfoliata |
| Common Vetch | Vicia sativa |
| Common Waterhemp | Amaranthus tuberculatus |
| Common Yarrow | Achillea millefolium |
| Compass Plant | Silphium laciniatum |
| Coontail | Ceratophyllum demersum |
| Coralberry | see Buckbrush |
| Coreopsis Beggarticks | Bidens polylepis |
| Corn Buttercup | Ranunculus arvensis |
| Corn Campion | see Corn Cockle |
| Corn Cockle | Agrostemma githago |
| Corn Gromwell | Buglossoides arvensis |
| Corn Rose | see Corn Cockle |
| Corn Speedwell | Veronica arvensis |
| Corn Spurry | Spergula arvensis |
| Cornflower | Centaurea cyanus |
| Cornsalad | Valerianella radiata |
| Cotton Morningglory | Ipomoea cordatotriloba |
| Cotton thistle | see Scotch Thistle |
| Cottonwood | Populus deltoides |
| Cow-itch | see Trumpetcreeper |
| Creamy Wild Indigo | Baptisia leucophaea |
| Creeping Bentgrass | Agrostis palustris |
| Creeping Phlox | Phlox subulata |
| Creeping Red Woodsorrel | Oxalis corniculata |
| Creeping Rush | Juncus repens |
| Creeping Water Purslane | see Water Purslane |
| Creeping Woodsorrel | see Creeping Red Woodsorrel |
| Creeping charlie | see Ground Ivy |
| Cressleaf Groundsel | Senecio glabellus |
| Crested anoda | see Spurred Anoda |
| Crimson Fountain Grass | see Chinese Fountain Grass |
| Crossvine | Bignonia capreolata |
| Crow Toes | see Birdsfoot Trefoil |
| Crowfoot Buttercup | Ranunculus sceleratus |
| Crowfoot violet | see Birds Foot Violet |
| Crowfootgrass | Dactyloctenium aegyptium |
| Crownvetch | Coronilla varia |
| Cup Plant | Silphium perfoliatum |
| Curly Dock | Rumex crispus |
| Curlycup Gumweed | Grindelia squarrosa |
| Curlyleaf Pondweed | Potamogeton crispus |
| Cursed Buttercup | see Crowfoot Buttercup |
| Cursed Crowfoot | see Crowfoot Buttercup |
| Cutleaf Eveningprimrose | Oenothera laciniata |
| Cutleaf Geranium | Geranium dissectum |
| Cutleaf Teasel | Dipsacus laciniatus |
| Cypress Spurge | Euphorbia cyparissias |
| Cypressvine Morningglory | Ipomoea quamoclit |
| Cypressweed | see Dogfennel |
| Daggerweed | see Spiny Cocklebur |
| Daisy Fleabane | see Annual Fleabane |
| Dallisgrass | Paspalum dilatatum |
| Dame's Rocket | Hesperis matronalis |
| Dandelion | Taraxacum officinale |
| Deer-tongue Grass | Panicum clandestinum or Dichanthelium clandestinum |
| Deer-tongue Panic Grass | see Deer-tongue Grass |
| Deptford Pink | Dianthus armeria |
| Devil'S Shoestring | see Buckbrush |
| Devil's Claw | Proboscidea louisianica |
| Devil's-tongue | see Prickly Pear |
| Devils Beggar-Ticks | see Common Beggar-ticks |
| Dichondra | Dichondra repens |
| Ditchweed | see Marijuana |
| Dodder | Cuscuta spp. |
| Dogfennel | Eupatorium capillifolium |
| Doveweed | Murdannia nudiflora |
| Downy Brome | Bromus tectorum |
| Duckweeds | Lemna spp. |
| Dwarf Dandelion | Krigia oppositifolia or Krigia caespitosa |
| Dyers Woad | Isatis tinctora |
| Eardrops | see Redvine |
| Eastern Black Nightshade | Solanum ptycanthum |
| Eastern Cottonwood | see Cottonwood |
| Eastern Gamagrass | Tripsacum dactyloides |
| Eastern Redcedar | Juniperus virginiana |
| Eclipta | Eclipta prostrata |
| Egeria | see Brazilian Elodea |
| Egypt grass | see Crowfootgrass |
| Elderberry | Sambucus nigra ssp. canadensis |
| Entireleaf Morningglory | Ipomoea hederacea var. integriuscula |
| Everlasting Pea | see Perennial Pea |
| Fall Panicum | Panicum dichotomiflorum |
| False Dandelion | see Common Catsear |
| Field Balm | see Calamint |
| Field Bindweed | Convolvulus arvensis |
| Field Dodder | see Dodder |
| Field Horsetail | Equisetum arvense |
| Field Madder | Sherardia arvensis |
| Field Pansy | Viola rafinesquii |
| Field Pennycress | Thlaspi arvense |
| Field Pepperweed | Lepidium campestre |
| Field Poppy | Papaver dubium |
| Field Violet | Viola arvensis |
| Fire Pink | Silene virginica |
| Fireweed | Erechtites hieracifolia |
| Flatweed | see Common Catsear |
| Florida Beggarweed | Desmodium tortuosum |
| Florida Betony | Stachys floridana |
| Florida Pusley | Richardia scabra |
| Flowering Spurge | Euphorbia corollata |
| Fogfruit | Phyla lanceolata |
| Fountain Grass | see Chinese Fountain Grass |
| Fourvalve Mimosa | see Sensitive Brier |
| Foxglove Penstemon | |
| Foxtail Barley | Hordeum jubatum |
| Foxtail Millet | Setaria italica |
| Frank's Sedge | Carex frankii |
| Frogfruit | see Fogfruit |
| Fuzzy Bean | see Missouri Fuzzy Bean |
| Gamagrass | see Eastern Gamagrass |
| Garden Vetch | see Common Vetch |
| Garlic Mustard | Allaria petiolata |
| German Moss | see Knawel |
| Giant Foxtail | Setaria faberi |
| Giant Ragweed | Ambrosia trifida |
| Giant Whiteweed | see Perennial Pepperweed |
| Globe Flatsedge | Cyperus echinatus |
| Goat's-beard | Tragopogon dubius |
| Goosegrass | Eleusine indica |
| Gopher Plant | see Caper Spurge |
| Grass pink | see Deptford Pink |
| Great Reedmace | see Cattails |
| Green Foxtail | Setaria viridis |
| Green Kyllinga | Kyllinga brevifolia |
| Green Milkweed | Asclepias viridis |
| Green Pigweed | see Slender Amaranth |
| Greenbrier | Smilax bona-nox |
| Ground Burnut | see Puncturevine |
| Ground Honeysuckle | see Birdsfoot Trefoil |
| Ground Ivy | Glechoma hederacea |
| Gum Weed | see Compass Plant |
| Hairy Bittercress | Cardamine hirsuta |
| Hairy Galinsoga | Galinsoga ciliata |
| Hare'S-Foot Clover | see Rabbitfoot Clover |
| Healall | Prunella vulgaris |
| Hedge | see Osage Orange |
| Hedge Bindweed | Calystegia sepium |
| Hedge Mustard | Sisymbrium officinale |
| Hemp Dogbane | Apocynum cannabinum |
| Hemp Sesbania | Sesbania exaltata |
| Henbit | Lamium amplexicaule |
| Herb Of Grace | see Blue Vervain |
| Hickory | Carya tomentosa |
| Highbush Blackberry | Rubus argutus |
| Hoary Plantain | Plantago virginica |
| Hoary Puccoon | Lithospermum canescens |
| Hogwort | see Woolly Croton |
| Honey Locust | Gleditsia triacanthos |
| Honeyvine Milkweed | Ampelamus albidus |
| Hop O'My Thumb | see Birdsfoot Trefoil |
| Hop Sedge | Carex lupulina |
| Hop Trefoil | see Large Hop Clover |
| Hophornbeam Copperleaf | Acalypha ostryifolia |
| Horehound | Marrubium vulgare |
| Hornwort | see Coontail |
| Horsenettle | Solanum carolinense |
| Horsetail | see Field Horsetail |
| Horseweed | Conyza canadensis |
| Hush-tomatoe | see Smooth Groundcherry |
| Illinois Bundleflower | Desmanthus illinoensis |
| Indian Currant | see Buckbrush |
| Indian Mock-Strawberry | Duchesnea indica |
| Indian Mustard | Brassica juncea |
| Indian Paint | see Bloodroot |
| Indian Woodoats | Chasmanthium latifolium |
| Inland Ironweed | see Baldwins Ironweed |
| Irish Moss | see Cypress Spurge |
| Ironweed | see Baldwins Ironweed |
| Italian Ryegrass | see Annual Ryegrass |
| Ivyleaf Morningglory | Ipomoea hederacea |
| Japanese Bamboo | Polygonum cuspidatum |
| Japanese Clover | see Common Lespedeza |
| Japanese Honeysuckle | Lonicera japonica |
| Japanese Hops | Humulus japonicus |
| Japanese Knotweed | see Japanese Bamboo |
| Japanese Silverberry | see Autumn Olive |
| Japanese Stiltgrass | Microstegium vimineum var. imberbe |
| Jerusalem Artichoke | Helianthus tuberosus |
| Jewelweed | see Touch-me-not |
| Jimsonweed | Datura stramonium |
| Johnsongrass | Sorghum halepense |
| Jointhead Arthraxon | Arthraxon hispidus |
| Kansas Thistle | see Buffalobur |
| Kentucky Bluegrass | Poa pratensis |
| Kidney Weed | see Dichondra |
| Kiss-Me-Dick | see Cypress Spurge |
| Knawel | Scleranthus annuus |
| Kochia | Kochia scoparia |
| Kudzu | Pueraria montana var. lobata |
| Ladies' Eardrops | see Redvine |
| Ladysthumb | Polygonum persicaria |
| Lanceleaf Fogfruit | see Fogfruit |
| Lanceleaf Ragweed | Ambrosia bidentata |
| Large Crabgrass | Digitaria sanguinalis |
| Large Hop Clover | Trifolium campestre |
| Large-bracted Plantain | Plantago aristata |
| Late Boneset | Eupatorium serotinum |
| Late Thoroughwort | see Late Boneset |
| Lateflowering Thoroughwort | see Late Boneset |
| Lawn Burweed | Soliva pterosperma |
| Lemon Balm | see Bee-balm |
| Lindheimer's Panic-grass | Dicanthelium acuminatum subsp. Lindheimeri |
| Little Barley | Hordeum pusillum |
| Livid Amaranth | see Purple Amaranth |
| Livid Pigweed | see Purple Amaranth |
| Lizards Tail | Saururus cernuus |
| Long Smooth-fruited Poppy | see Field Poppy |
| Long-beaked Arrowhead | Sagittaria australis |
| Long-stalked Phyllanthus | Phyllanthus tenellus |
| Longspine Sandbur | Cenchrus longispinus |
| Lyreleaf Sage | Salvia lyrata |
| Mandrake | see Mayapple |
| Marestail | see Horseweed |
| Marijuana | Cannabis sativa |
| Marlahan mustard | see Dyers Woad |
| Marsh Dayflower | Murdannia keisak |
| Marsh Pennywort | Hydrocotyle umbellata |
| Marshelder | Iva annua |
| Mary'S Grass | see Japanese Stiltgrass |
| Mayapple | Podophyllum peltatum |
| Maypop Passionflower | Passiflora incarnata |
| Mayweed | see Mayweed Chamomile |
| Mayweed Chamomile | Anthemis cotula |
| Meadow Foxtail | Alopecurus pratensis |
| Meadow Garlic | see Wild Onion |
| Mexican Sandbur | see Puncturevine |
| Microstegium | see Japanese Stiltgrass |
| Midwestern Arrowhead | Sagittaria brevirostra |
| Milfoil | see Common Yarrow |
| Mimosa | Albizia julibrissin |
| Missouri Fuzzy Bean | Strophostyles helvula missouriensis |
| Mockernut Hickory | see Hickory |
| Mole Plant | see Caper Spurge |
| Morrow's Bush-Honeysuckle | Lonicera morrowii |
| Moss Pink | see Creeping Phlox |
| Moth Mullein | Verbascum blattaria |
| Mouse-ear Cress | Arabidopsis thaliana |
| Mouseear Chickweed | Cerastium vulgatum |
| Mouseear Hawkweed | Hieracium pilosella |
| Mousetail | Myosurus minimus |
| Mugwort | Artemisia vulgaris |
| Mulberry Weed | Fatoua villosa |
| Mullein | see Common Mullein |
| Multiflora Rose | Rosa multiflora |
| Musk Thistle | Carduus nutans |
| Musk-grass | see Chara |
| Nailrod | see Cattails |
| Neckweed | see Purslane Speedwell |
| New England Aster | Aster novae-angliae |
| New York Ironweed | Vernonia noveboracensis |
| Nimblewill | Muhlenbergia schreberi |
| Nodding Spurge | Chamaesyce nutans |
| Nodding Thistle | see Musk Thistle |
| Northern Dewberry | Rubus flagellaris |
| Ohio Spiderwort | Tradescantia ohiensis |
| Oldfield Cinquefoil | see Sulfur Cinquefoil |
| Oldfield Toadflax | see Common Toadflax |
| Orange Puccoon | see Hoary Puccoon |
| Orchardgrass | Dactylis glomerata |
| Oregon Vetch | see Common Vetch |
| Oriental Mustard | see Indian Mustard |
| Osage Orange | Maclura pomifera |
| Oxeye Daisy | Chrysanthemum leucanthemum |
| Pale Indian Plantain | Arnoglossum atriplicifolium |
| Paleseed Plantain | see Hoary Plantain |
| Palmer Amaranth | Amaranthus palmeri |
| Palmer Pigweed | see Palmer Amaranth |
| Palmleaf Morningglory | Ipomoea wrightii |
| Parrotfeather | Myriophyllum aquaticum |
| Partridgepea | Cassia fasciculata |
| Pennsylvania Smartweed | Polygonum pensylvanicum |
| Penstemon digitalis | see Foxglove Penstemon |
| Perennial Lupine | Lupinus perennis |
| Perennial Pea | Lathyrus latifolius |
| Perennial Pepperweed | Lepidium latifolium |
| Perfoliate Pennycress | Thlaspi perfoliatum |
| Perilla Mint | Perilla frutescens |
| Persian Speedwell | Veronica persica |
| Pickerelweed | Pontederia cordata |
| Piedmont Bedstraw | Cruciata pedemontana |
| Pin Oak | Quercus palustris |
| Pineapple-weed | Matricaria matricarioides |
| Pinnate Tansymustard | Descurainia pinnata |
| Pitted Morningglory | Ipomoea lacunosa |
| Plumeless Thistle | Carduus acanthoides |
| Poison Hemlock | Conium maculatum |
| Poison Ivy | Toxicodendron radicans |
| Pokeberry | see Common Pokeweed |
| Poorjoe | Diodia teres |
| Potato Vine | see Chinese Yam |
| Prairie Mimosa | see Illinois Bundleflower |
| Prairie Rose | Rosa Setigera |
| Prairie Wild Rose | Rosa arkansana |
| Prairie beardtongue | see Trumpet Penstemon |
| Prickly Lettuce | Lactuca serriola |
| Prickly Pear | Opuntia humifusa |
| Prickly Sida | Sida spinosa |
| Prostrate Amaranth | see Prostrate Pigweed |
| Prostrate Knotweed | Polygonum aviculare |
| Prostrate Pigweed | Amaranthus blitoides |
| Puncturevine | Tribulus terrestris |
| Purple Amaranth | Amaranthus blitum |
| Purple Cockle | see Corn Cockle |
| Purple Cudweed | Gnaphalium purpureum |
| Purple Deadnettle | Lamium purpureum |
| Purple Feathergrass | see Chinese Fountain Grass |
| Purple Loosestrife | Lythrum salicaria |
| Purple Lovegrass | Eragrostis spectabilis |
| Purple Milkweed | Asclepias purpurascens |
| Purple Nutgrass | see Purple Nutsedge |
| Purple Nutsedge | Cyperus rotundus |
| Purple-Headed Sneezeweed | Helenium flexuosum |
| Purplehead Sneezeweed | see Purple-Headed Sneezeweed |
| Purpletop | Tridens flavus |
| Purslane Speedwell | Veronica peregrina |
| Quackgrass | Elymus repens |
| Queen Anne's Lace | see Wild Carrot |
| Rabbitfoot Clover | Trifolium arvense |
| Rattlebox | see Showy Crotalaria |
| Rattlesnake Weed | see Florida Betony |
| Red Clover | Trifolium pratense |
| Red Deadnettle | see Purple Deadnettle |
| Red Morningglory | Ipomoea coccinea |
| Red Puccoon | see Bloodroot |
| Red Sorrel | Rumex acetosella |
| Redroot Pigweed | Amaranthus retroflexus |
| Redstem Filaree | Erodium cicutarium |
| Redtop | see Creeping Bentgrass |
| Redvine | Brunnichia ovata |
| Reed Canarygrass | Phalaris arundinacea |
| Rice Flatsedge | Cyperus iria |
| Richweed | see White Snakeroot |
| Roadside thistle | see Tall Thistle |
| Rosinweed | see Compass Plant |
| Rough Cinquefoil | Potentilla norvegica |
| Roughstalk Bluegrass | Poa trivialis |
| Roundleaf Greenbrier | Smilax rotundifolia |
| Russian Olive | Elaeagnus angustifolia |
| Russian Thistle | Salsola kali |
| Saint Johnswort | Hypericum perforatum |
| Saltwort | see Russian Thistle |
| Sandbar Willow | Salix exigua |
| Sassafras | Sassafras albidum |
| Sassy Jack | see Caper Spurge |
| Saw Greenbrier | see Greenbrier |
| Sawtooth Blackberry | see Highbush Blackberry |
| Scarlet Indian Paintbrush | Castilleja coccinea |
| Scarlet Pimpernel | Anagallis arvensis |
| Scarlet Toothcup | see Valley Redstem |
| Scotch Thistle | Onopordum acanthoides |
| Scouring Rush | see Field Horsetail |
| Scouringrush | Equisetum hyemale |
| Sensitive Brier | Mimosa quadrivalvis var. nuttallii |
| Sericea Lespedeza | Lespedeza cuneata |
| Shagbark Hickory | Carya ovata |
| Sharp-Toothed Blackberry | see Highbush Blackberry |
| Shattercane | Sorghum bicolor |
| Sheep-Foot | see Birdsfoot Trefoil |
| Shepherd's-purse | Capsella bursa-pastoris |
| Shingle Oak | Quercus imbricaria |
| Shoo Fly | see Apple-of-Peru |
| Showy Crotalaria | Crotalaria spectabilis |
| Showy Evening-primrose | Oenothera speciosa |
| Showy Rattlebox | see Showy Crotalaria |
| Showy Ticktrefoil | Desmodium canadense |
| Sicklepod | Cassia obtusifolius |
| Silver Wormwood | see White Sage |
| Silverleaf Nightshade | Solanum elaeagnifolium |
| Slender Amaranth | Amaranthus viridis |
| Slender Mountain Mint | Pycnanthemum tenuifolium |
| Slender Naiad | Najas minor |
| Slender Pigweed | see Slender Amaranth |
| Slender Pondweed | Potamogeton pusillus |
| Small Pondweed | see Slender Pondweed |
| Smallflower Geranium | Geranium molle |
| Smallflower Morningglory | Jacquemontia tamnifolia |
| Smallflowered Bittercress | Cardamine parviflora |
| Smallflowered Phacelia | Phacelia dubia |
| Smooth Bedstraw | Galium mollugo |
| Smooth Bedstraw | see Bedstraw |
| Smooth Blackberry | Rubus allegheniensis |
| Smooth Blackberry | see Highbush Blackberry |
| Smooth Brome | Bromus inermis |
| Smooth Bromegrass | see Smooth Brome |
| Smooth Crabgrass | Digitaria ischaemum |
| Smooth Groundcherry | Physalis longifolia var. subglabrata |
| Smooth Hawksbeard | Crepis capillaris |
| Smooth Pigweed | Amaranthus hybridus |
| Smooth Sumac | Rhus glabra |
| Smooth Vetch | Vicia dasycarpa |
| Snow-on-the-Mountain | Euphorbia marginata |
| Snowy spurge | see Snow-on-the-Mountain |
| Soapwort | see Bouncing-bet |
| Southern Cottonwood | see Cottonwood |
| Southern Sneezeweed | see Purple-Headed Sneezeweed |
| Spanish Needles | Bidens bipinnata |
| Spanish Thistle | see Spiny Cocklebur |
| Spiked loosestrife | see Purple Loosestrife |
| Spiny Amaranth | Amaranthus spinosus |
| Spiny Burweed | see Spiny Cocklebur |
| Spiny Clotbur | see Spiny Cocklebur |
| Spiny Cocklebur | Xanthium spinosum |
| Spiny Pigweed | see Spiny Amaranth |
| Spiny Sowthistle | Sonchus asper |
| Spotted Knapweed | Centaurea maculosa |
| Spotted Spurge | Chamaesyce maculata |
| Spotted St. Johnswort | Hypericum punctatum |
| Spurred Anoda | Anoda cristata |
| Squaw-root | Conopholis americana |
| Squawweed | see Cressleaf Groundsel |
| St. Augustine Grass | Stenotaphrum secundatum |
| Star Thistle | see Spotted Knapweed |
| Star-of-Bethlehem | Ornithogalum umbellatum |
| Starch Grapehyacinth | Muscari racemosum |
| Sticktight | see Common Beggar-ticks |
| Stickweed | Verbesina occidentalis |
| Stinging Nettle | Urtica dioica |
| Stinkgrass | Eragrostis cilianensis |
| Stone Clover | see Rabbitfoot Clover |
| Stonewort | see Chara |
| Straw-colored Flatsedge | Cyperus strigosus |
| Sulfur Cinquefoil | Potentilla recta |
| Summer Spurge | see Sun Spurge |
| Sun Spurge | Euphorbia helioscopia |
| Swamp Milkweed | Asclepias incarnata |
| Swamp Smartweed | Polygonum coccineum |
| Swamp Verbena | see Blue Vervain |
| Sweet Annie | see Annual Wormwood |
| Sweet Betty | see Bouncing-bet |
| Sweet Pea | see Perennial Pea |
| Sweet Vernalgrass | Anthoxanthum odoratum |
| Sweetgum | Liquidambar styraciflua |
| Swine wart cress | see Swinecress |
| Swinecress | Coronopus didymus |
| Tall Fennel | see Dogfennel |
| Tall Fescue | Lolium arundinaceum |
| Tall Goldenrod | Solidago canadensis var. scabra |
| Tall Green Milkweed | Asclepias hirtella |
| Tall Morningglory | Ipomoea purpurea |
| Tall Oatgrass | see Bulbous Oatgrass |
| Tall Thistle | Cirsium altissimum |
| Tall Waterhemp | see Common Waterhemp |
| Tansy Mustard | Descurainia pinnata |
| Tansy Mustard | see Pinnate Tansymustard |
| Tearthumb | Polygonum arifolium |
| Teaweed | see Prickly Sida |
| Texas Panicum | Panicum texanum |
| Texas Thistle | see Buffalobur |
| Thorny Buryweed | see Spiny Cocklebur |
| Thoroughwort Pennycress | see Perfoliate Pennycress |
| Three-way Sedge | Dulichium arundinaceum |
| Timothy | Phleum pratense |
| Toothed Spurge | Euphorbia dentata |
| Toothed Spurge | see Wild Poinsettia |
| Touch-me-not | Impatiens capensis |
| Trailing Crownvetch | see Crownvetch |
| Tree-of-Heaven | Ailanthus altissima |
| Trifoliate Orange | Poncirus trifoliata |
| Tropic Croton | Croton glandulosus var. septentrionalis |
| Tropical Soda Apple | Solanum viarum |
| Trumpet Penstemon | Penstemon tubaeflorus |
| Trumpetcreeper | Campsis radicans |
| Tufted Knotweed | Polygonum caespitosum var .longisetum |
| Tumble Pigweed | Amaranthus albus |
| Tumbleweed | see Russian Thistle |
| Valley Redstem | Ammannia coccinea |
| Variable-leaf Pondweed | Potamogeton diversifolius |
| Velvetleaf | Abutilon theophrasti |
| Velvetleaf Ticktrefoil | Desmodium viridiflorum |
| Venice Mallow | Hibiscus trionum |
| Viper's Bugloss | Echium vulgare |
| Virgin's Bower | Clematis terniflora |
| Virginia Bluebells | Mertensia virginica |
| Virginia Buttonweed | Diodia virginiana |
| Virginia Copperleaf | Acalypha virginica |
| Virginia Cowslip | see Virginia Bluebells |
| Virginia Creeper | Parthenocissus quinquefolia |
| Virginia Knotweed | Polygonum virginianum |
| Virginia Pepperweed | Lepidium virginicum |
| Virginia Plantain | see Hoary Plantain |
| Virginia Smartweed | see Virginia Knotweed |
| Volunteer Wheat | see Wheat |
| Water Hyacinth | Eichhornia crassipes |
| Water Pennywort | see Marsh Pennywort |
| Water Plantain | Alisma subcordatum |
| Water Purslane | Ludwigia palustris |
| Water Willow | Justicia americana |
| Water-starwort | Callitriche heterophylla |
| Waterhemp | see Common Waterhemp |
| Waterlilies | Nymphaea spp. |
| Watermeal | Wolffia spp. |
| Watershield | Brasenia schreberi |
| Waterthread Pondweed | see Variable-leaf Pondweed |
| Western Ironweed | see Baldwins Ironweed |
| Western Panic-grass | see Lindheimer's Panic-grass |
| Western Rock Jasmine | Androsace occidentalis |
| Western Salsify | see Goat's-beard |
| Western Tansymustard | see Pinnate Tansymustard |
| Western Yarrow | see Common Yarrow |
| Wheat | Triticum aestivum |
| White Avens | Geum canadense |
| White Campion | Silene alba |
| White Clover | Trifolium repens |
| White Flowered Mazus | Mazus japonicus |
| White Heath Aster | Aster pilosus |
| White Hickory | see Hickory |
| White Horehound | see Horehound |
| White Sage | Artemisia ludoviciana |
| White Sagebrush | see White Sage |
| White Sanicle | see White Snakeroot |
| White Snakeroot | Ageratina altissima |
| White Sweet Clover | Melilotus alba |
| White Vervain | Verbena urticifolia |
| White evening-primrose | see Showy Evening-primrose |
| White wand beardtongue | see Trumpet Penstemon |
| White wand penstemon | see Trumpet Penstemon |
| Wild Basil | Satureja vulgaris |
| Wild Bergamot | see Bee-balm |
| Wild Blue Phlox | see Blue Phlox |
| Wild Buckwheat | Polygonum convolvulus |
| Wild Carrot | Daucus carota |
| Wild Chervil | Chaerophyllum procumbens |
| Wild Chrysanthemum | see Mugwort |
| Wild Four-O Clock | Mirablis nyctaginea |
| Wild Garlic | Allium vineale |
| Wild Grapes | Vitis spp. |
| Wild Mustard | Brassica kaber |
| Wild Oat | Avena fatua |
| Wild Onion | Allium canadense |
| Wild Pansy | see Field Violet |
| Wild Parsnip | Pastinaca sativa |
| Wild Poinsettia | Euphorbia heterophylla |
| Wild Radish | Raphanus raphanistrum |
| Wild Sunflower | see Common Sunflower |
| Wild Sweet William | see Blue Phlox |
| Wild Vervain | see Blue Vervain |
| Wild-proso Millet | Panicum miliaceum |
| Winged Sumac | Rhus copallina |
| Wingstem | Verbesina alternifolia |
| Wire Grass | see Bermudagrass |
| Wireweed | see Prostrate Knotweed |
| Witchgrass | Panicum capillare |
| Woodland Phlox | see Blue Phlox |
| Woodrush | Luzula bulbosa |
| Woolly Croton | Croton capitatus |
| Woolly Cupgrass | Eriochloa villosa |
| Wooly Ragwort | Senecio tomentosus |
| Yellow Crownbeard | see Stickweed |
| Yellow Fox Sedge | Carex annectens |
| Yellow Foxtail | Setaria glauca |
| Yellow Nutsedge | Cyperus esculentus |
| Yellow Rocket | Barbarea vulgaris |
| Yellow Woodsorrel | Oxalis stricta |
| Yellow-flowered Leaf-cup | Smallanthus uvedalia |
| Yellowfruit Sedge | see Yellow Fox Sedge |
| Yucca | Yucca filamentosa |
| Zarzaparrilla | see Greenbrier |