Weed ID Guide // University of Missouri

Common Name	Latin Name
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

Common Name

Latin Name

Saint Johnswort

Hypericum perforatum

Saltwort

see Russian Thistle

Sandbar Willow

Salix exigua

Sassafras

Sassafras albidum

Sassy Jack

see Caper Spurge