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U.S. Invasive Weeds

Click on an accepted name below to view its Plant Profile with more information, and web links if available. Invasive plants that are synonyms are indented beneath the current PLANTS accepted name. You may view invasive lists by source by clicking on the source acronyms at the top of the report.

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 NRCS Invasive Species policy
 Invasive Species Executive Order 13112
List of Invasive PlantsScientific Name = A| B| C| D| E| F| G| H| I| J| K| L| M| N| O| P| Q| R| S| T| U| V| W| X| Y| Z| all
List of Invasive PlantsCommon Name = A| B| C| D| E| F| G| H| I| J| K| L| M| N| O| P| Q| R| S| T| U| V| W| X| Y| Z| all

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US Federal Noxious Weed List
STATE State noxious weed lists for 35 states
CalEPPC California Exotic Pest Plant Council, Exotic pest plant list
FLEPPC Florida Exotic Pest Plant Council, Invasive plant list
HEAR Hawaiian Ecosystems at Risk Project, Information index for selected alien plants in Hawaii
KY Weeds of Kentucky and adjacent states: A field guide
NE&GP Weeds of Nebraska and the Great Plains
N'EAST Weeds of the Northeast
SEEPPC Southeast Exotic Pest Plant Council, Invasive exotic pest plants in Tennessee
SWSS Southern Weed Science Society, Weeds of the United States and Canada
WI Wisconsin manual of control recommendations for ecologically invasive plants
WSWS Weeds of the West

Symbol Common Name Nativity
in US*
US STATE CalEPPC FLEPPC HEAR KY NE&GP N'EAST SEEPPC SWSS WI WSWS
Scientific Name

sacatrapo
CAPA11 Caperonia palustris N SWSS
Sacramento bur
TRSE4 Triumfetta semitriloba N STATE
sacred bamboo
NADO Nandina domestica I FLEPPC
sacred datura
DAIN5 Datura innoxia XU WSWS
saffron thistle
CALA20 Carthamus lanatus I STATE WSWS
sage mint
SARE3 Salvia reflexa N NE&GP; SWSS WSWS
salicaire
LYSA2 Lythrum salicaria I STATE CalEPPC NE&GP; N'EAST SEEPPC SWSS WI WSWS
saline saltbush
ATSU2 Atriplex subspicata N NE&GP;
salsifis majeur
TRDU Tragopogon dubius I KY NE&GP; N'EAST SEEPPC SWSS WSWS
salt meadow cordgrass
SPPA Spartina patens N STATE CalEPPC
saltcedar
TAAR6 Tamarix aralensis I FLEPPC
saltcedar
TACH2 Tamarix chinensis I STATE CalEPPC
saltcedar
TAGA Tamarix gallica I CalEPPC
saltcedar
TAMAR2 Tamarix STATE
saltcedar
TAPA4 Tamarix parviflora I STATE CalEPPC
saltcedar
TARA Tamarix ramosissima I STATE CalEPPC WSWS
saltgrass
DISP Distichlis spicata N NE&GP; WSWS
saltmarsh aster
SYDI2 Symphyotrichum divaricatum N
ASSUL Aster subulatus var. ligulatus NE&GP;
saltmarsh ironwood
CAGL11 Casuarina glauca I FLEPPC HEAR
salvinia
SALVI2 Salvinia STATE
salvinia
SAMO5 Salvinia molesta I US STATE CalEPPC
sand bittercress
CAPA12 Cardamine parviflora N SWSS
sand briar
SOCA3 Solanum carolinense N STATE KY NE&GP; N'EAST SWSS
sand dropseed
SPCR Sporobolus cryptandrus N NE&GP;
sand sagebrush
ARFI2 Artemisia filifolia N NE&GP; WSWS
sandbur
CESP4 Cenchrus spinifex N
CEIN4 Cenchrus incertus STATE SWSS
sandhill sage
ARFI2 Artemisia filifolia N NE&GP; WSWS
sandvine
CYLA Cynanchum laeve N NE&GP;
sandweed
SPAR Spergula arvensis I WSWS
Santa Maria
CAAN22 Calophyllum antillanum N FLEPPC
Santa Maria feverfew
PAHY Parthenium hysterophorus I SWSS
santintail
IMCY Imperata cylindrica I US STATE FLEPPC SWSS
saramattagrass
ISRU Ischaemum rugosum I US STATE
satinleaf
CHOL Chrysophyllum oliviforme N HEAR
satintail
IMBR2 Imperata brevifolia N STATE
saulangi
DICI Digitaria ciliaris N SWSS
Sawah flowering rush
LIFL5 Limnocharis flava XU STATE
sawgrass
MIFL3 Miscanthus floridulus I STATE
Sawtooth sunflower
HEGR4 Helianthus grosseserratus N NE&GP;
scarlet gaura
GACO5 Gaura coccinea N STATE NE&GP;
scarlet globemallow
SPCO Sphaeralcea coccinea N NE&GP; WSWS
scarlet morningglory
IPCO3 Ipomoea coccinea I SWSS WSWS
scarlet pimpernel
ANAR Anagallis arvensis I KY N'EAST
scarlet-fruited gourd
COGR9 Coccinia grandis I STATE HEAR WSWS
scarthgrass
GAAP2 Galium aparine N KY NE&GP; N'EAST SWSS WSWS
scented gaura
GADR Gaura drummondii N STATE
scentless chamomile
ANAR6 Anthemis arvensis I STATE
scentless mayweed
TRPE21 Tripleurospermum perforata I
MAPE2 Matricaria perforata STATE
schefflera
SCAC2 Schefflera actinophylla I FLEPPC HEAR
scotch attorney
CLRO Clusia rosea N HEAR
Scotch broom
CYSC4 Cytisus scoparius I STATE CalEPPC WSWS
Scotch broom
CYSCA Cytisus scoparius var. andreanus I STATE
Scotch broom
CYSCS2 Cytisus scoparius var. scoparius I STATE
Scotch cotton thistle
ONAC Onopordum acanthium I STATE NE&GP; SWSS WSWS
Scotch thistle
ONAC Onopordum acanthium I STATE NE&GP; SWSS WSWS
scouring rush
EQAR Equisetum arvense N NE&GP; N'EAST WSWS
scouringrush horsetail
EQHY Equisetum hyemale N SWSS
scutch
ELRE4 Elymus repens I
ELRE3 Elytrigia repens STATE N'EAST SWSS WI WSWS
se mbulabula
CEEC Cenchrus echinatus N STATE HEAR SWSS
sea hibiscus
HITI Hibiscus tiliaceus I FLEPPC
sea oxeye daisy
BOFR2 Bocconia frutescens N STATE HEAR
seashore saltgrass
DISP Distichlis spicata N NE&GP; WSWS
seaside arrowgrass
TRMA4 Triglochin maritimum N NE&GP; WSWS
seaside bentgrass
AGST2 Agrostis stolonifera N NE&GP; WSWS
seaside mahoe
THPO3 Thespesia populnea I FLEPPC
seed grass
CHAC Chrysopogon aciculatus I US STATE
selfheal
PRVU Prunella vulgaris N NE&GP; N'EAST
selloa pampasgrass
COJU2 Cortaderia jubata I STATE CalEPPC HEAR
Senegal date palm
PHRE Phoenix reclinata I FLEPPC
septicweed
SEOC2 Senna occidentalis I SEEPPC
CAOC3 Cassia occidentalis SWSS
sericea lespedeza
LECU Lespedeza cuneata I STATE SEEPPC
serrate spurge
EUSE12 Euphorbia serrata I STATE
serrated tussock grass
NATR3 Nassella trichotoma XU US STATE
sessile joyweed
ALSE4 Alternanthera sessilis N US STATE
sewer vine
PACR15 Paederia cruddasiana I STATE FLEPPC
shaggy soldier
GAQU Galinsoga quadriradiata I KY NE&GP;
GACI4 Galinsoga ciliata N'EAST SWSS
shamel ash
FRUH Fraxinus uhdei I HEAR
sharpleaf cancerwort
KIEL Kickxia elatine I WSWS
sharpleaf groundcherry
PHAC6 Physalis acutifolia N
PHWR3 Physalis wrightii WSWS
sharppoint fluvellin
KIEL Kickxia elatine I WSWS
shattercane
SOBI2 Sorghum bicolor I STATE NE&GP; N'EAST SWSS
sheep sorrel
OXST Oxalis stricta N KY NE&GP; N'EAST SWSS
sheep sorrel
RUAC3 Rumex acetosella I STATE NE&GP; N'EAST SWSS WSWS
shepardspurse
CABU2 Capsella bursa-pastoris I STATE KY NE&GP; N'EAST SWSS WSWS
shoebutton ardisia
AREL4 Ardisia elliptica I STATE FLEPPC HEAR
shoofly
CADE15 Caesalpinia decapetala I HEAR
short pitpit
SEPA6 Setaria palmifolia I HEAR
short ragweed
AMAR2 Ambrosia artemisiifolia N STATE KY NE&GP; N'EAST SWSS WSWS
short-fringed knapweed
CENI3 Centaurea nigrescens I STATE
shortbristle horned beaksedge
RHCO2 Rhynchospora corniculata N SWSS
shortpod mustard
BRNI Brassica nigra I CalEPPC HEAR WSWS
shoshigi
ACCO Acacia confusa I HEAR
showy medinilla
MEMA20 Medinilla magnifica XU HEAR
showy milkweed
ASSP Asclepias speciosa N WSWS
showy partridgepea
CHFAF Chamaecrista fasciculata var. fasciculata N
CAFA Cassia fasciculata KY NE&GP; SWSS
showy rattlebox
CRSP2 Crotalaria spectabilis I SWSS
shrub althea
HISY Hibiscus syriacus I SEEPPC
shrubby nightshade
SORO3 Solanum robustum I STATE
Siamweed
CHOD Chromolaena odorata N STATE
sibara
SIVI2 Sibara virginica N KY
Siberian elm
ULPU Ulmus pumila I STATE NE&GP; SEEPPC
sicklepod
SEOB4 Senna obtusifolia N SEEPPC
CAOB5 Cassia obtusifolia SWSS
sicklepod senna
SEOB4 Senna obtusifolia N SEEPPC
silk reed
NERE Neyraudia reynaudiana I STATE FLEPPC
silk tree
ALJU Albizia julibrissin I FLEPPC SEEPPC
silky crazyweed
OXSE Oxytropis sericea N WSWS
silky oak
GRRO Grevillea robusta I HEAR
silky wormwood
ARDR4 Artemisia dracunculus N NE&GP;
silver crabgrass
ELIN3 Eleusine indica I KY NE&GP; N'EAST SWSS WSWS
silver oak
GRRO Grevillea robusta I HEAR
silver pampas grass
COSE4 Cortaderia selloana I CalEPPC HEAR
silver sagebrush
ARCA13 Artemisia cana N WSWS
silver thread moss
BRAR71 Bryum argenteum N N'EAST
silvergreen bryum moss
BRAR71 Bryum argenteum N N'EAST
silverleaf cotoneaster
COPA14 Cotoneaster pannosus I CalEPPC HEAR
silverleaf nightshade
SOEL Solanum elaeagnifolium N STATE SWSS WSWS
silvery bryum
BRAR71 Bryum argenteum N N'EAST
silvery wormwood
ARFI2 Artemisia filifolia N NE&GP; WSWS
simpleleaf bushweed
FLAC Flueggea acidoton I
FLVI Flueggea virosa FLEPPC
simplestem bur-reed
SPER Sparganium erectum N US STATE
singleseed hawthorn
CRMO3 Crataegus monogyna I CalEPPC
sisal
AGSI2 Agave sisalana I FLEPPC
sixweeks fescue
VUOC Vulpia octoflora N NE&GP;
sixweeks grass
VUOC Vulpia octoflora N NE&GP;
skeletonleaf bursage
AMTO3 Ambrosia tomentosa N STATE WSWS
FRDI3 Franseria discolor STATE
skeletonweed
LYJU Lygodesmia juncea N NE&GP; WSWS
skunk vine
PAFO3 Paederia foetida I STATE FLEPPC
skunkweed
CRTE4 Croton texensis N NE&GP;
sleepingplant
CHFAF Chamaecrista fasciculata var. fasciculata N
CAFA Cassia fasciculata KY NE&GP; SWSS
slender amaranth
AMVI Amaranthus viridis N
AMGR10 Amaranthus gracilis SWSS
slender aster
SYDI2 Symphyotrichum divaricatum N
ASEX5 Aster ?exilis SWSS
ASSUL Aster subulatus var. ligulatus NE&GP;
slender foxtail
ALMY Alopecurus myosuroides I STATE WSWS
slender nettle
URDI Urtica dioica NI NE&GP; SEEPPC WSWS
slender nettle
URDIG Urtica dioica ssp. gracilis N
URDIP2 Urtica dioica var. procera N'EAST
slender oat
AVBA Avena barbata I CalEPPC
slender Russian thistle
SACO8 Salsola collina I STATE
slender speedwell
VEFI Veronica filiformis I N'EAST
slender wildoat
AVBA Avena barbata I CalEPPC
slender yard rush
JUTE Juncus tenuis N N'EAST
slender-flowered thisle
CATE2 Carduus tenuiflorus I STATE
slim amaranth
AMHY Amaranthus hybridus N KY N'EAST SWSS
slimleaf lambsquarters
CHLE4 Chenopodium leptophyllum N SWSS
small broomrape
ORMI Orobanche minor I STATE
small crabgrass
DIIS Digitaria ischaemum I NE&GP; SWSS
small fruited falseflax
CAMI2 Camelina microcarpa I NE&GP; SWSS WSWS
small leaf climbing fern
LYMI Lygodium microphyllum I STATE FLEPPC
small lupine
LUPU Lupinus pusillus N NE&GP;
small ragweed
AMAR2 Ambrosia artemisiifolia N STATE KY NE&GP; N'EAST SWSS WSWS
small soapweed
YUGL Yucca glauca N NE&GP; WSWS
small tumbleweed mustard
SILO3 Sisymbrium loeselii I NE&GP;
smallflower buttercup
RAAB Ranunculus abortivus N KY NE&GP;
smallflower crowfoot
RAAB Ranunculus abortivus N KY NE&GP;
smallflower tamarisk
TAPA4 Tamarix parviflora I STATE CalEPPC
smallflower umbrella sedge
CYDI4 Cyperus difformis I SWSS
smallflowered bittercress
CAPA12 Cardamine parviflora N SWSS
smallflowered gaura
GAMO5 Gaura mollis N
GAPA6 Gaura parviflora WSWS
smallflowered marshelder
IVAX Iva axillaris N STATE NE&GP; WSWS
smallflowered morning glory
COAR4 Convolvulus arvensis I STATE KY NE&GP; N'EAST SWSS WI WSWS
smallseed falseflax
CAMI2 Camelina microcarpa I NE&GP; SWSS WSWS
smartweed
POPE3 Polygonum persicaria I? SEEPPC SWSS WSWS
smoke-on-the-prairie
EUMA8 Euphorbia marginata N NE&GP; SWSS
smooth brome
BRIN2 Bromus inermis NI NE&GP; SEEPPC WI
smooth cordgrass
SPAL Spartina alterniflora N STATE CalEPPC
smooth crabgrass
DICI Digitaria ciliaris N SWSS
smooth crabgrass
DIIS Digitaria ischaemum I NE&GP; SWSS
smooth distaff thistle
CALAB2 Carthamus lanatus ssp. baeticus I
CABA5 Carthamus baeticus STATE
smooth dock
RUAL4 Rumex altissimus N STATE NE&GP;
smooth groundcherry
PHLOS Physalis longifolia var. subglabrata N
PHSU8 Physalis subglabrata N'EAST SWSS
smooth hawkweed
HILA4 Hieracium laevigatum N STATE
smooth horsetail
EQLA Equisetum laevigatum N WSWS
smooth millet
SEPU8 Setaria pumila I SEEPPC
smooth oxeye
HEHE5 Heliopsis helianthoides N NE&GP;
smooth pigweed
AMHY Amaranthus hybridus N KY N'EAST SWSS
smooth scouringrush
EQLA Equisetum laevigatum N WSWS
smooth Solomon's seal
POBI2 Polygonatum biflorum N NE&GP;
smooth sumac
RHGL Rhus glabra N NE&GP;
smooth woodyaster
XYGL Xylorhiza glabriuscula N WSWS
smoothseed alfalfa dodder
CUAP2 Cuscuta approximata I STATE N'EAST
smother weed
BAHY Bassia hyssopifolia I CalEPPC
smut grass
SPIN4 Sporobolus indicus NI SWSS
snake cucumber
CUME Cucumis melo I SWSS
CUMED Cucumis melo var. dudaim STATE
snakeroot
AGALA Ageratina altissima var. altissima N
EURU6 Eupatorium rugosum KY NE&GP;
snow-on-the-mountain
EUMA8 Euphorbia marginata N NE&GP; SWSS
soap bush
CLHI3 Clidemia hirta N HEAR
soapweed yucca
YUGL Yucca glauca N NE&GP; WSWS
soapwort
SAOF4 Saponaria officinalis I STATE CalEPPC KY NE&GP; WSWS
soft brome
BRHO2 Bromus hordeaceus I SEEPPC
soft brome
BRHOH Bromus hordeaceus ssp. hordeaceus I
BRMO2 Bromus mollis SWSS WSWS
BRMO2 Bromus mollis SWSS WSWS
soft chess
BRHO2 Bromus hordeaceus I SEEPPC
soft chess
BRHOH Bromus hordeaceus ssp. hordeaceus I
BRMO2 Bromus mollis SWSS WSWS
solitary palm
PTEL Ptychosperma elegans I FLEPPC
Solomon's seal
POBI2 Polygonatum biflorum N NE&GP;
soni
RUMO4 Rubus moluccanus XU US STATE N'EAST
sorgho d'Alep
SOHA Sorghum halepense I STATE KY NE&GP; N'EAST SEEPPC SWSS WSWS
sorghum
SOBI2 Sorghum bicolor I STATE NE&GP; N'EAST SWSS
sorghum
SOPR3 Sorghum propinquum XU STATE
sorgo de alepo
SOHA Sorghum halepense I STATE KY NE&GP; N'EAST SEEPPC SWSS WSWS
soros-tree
ALLE Albizia lebbeck I FLEPPC HEAR
sosigi
ACCO Acacia confusa I HEAR
sour dock
RUCR Rumex crispus I STATE KY NE&GP; N'EAST SWSS WSWS
sour grass
PACO14 Paspalum conjugatum N HEAR
sourgrass
OXST Oxalis stricta N KY NE&GP; N'EAST SWSS
South African oxygen weed
LAMA15 Lagarosiphon major XU US STATE
South American waterweed
EGDE Egeria densa I STATE CalEPPC HEAR NE&GP; SEEPPC WI WSWS
ELDE3 Elodea densa STATE
South Wales wattle
ACPA81 Acacia parramattensis I HEAR
southern annual saltmarsh aster
SYDI2 Symphyotrichum divaricatum N
ASSUL Aster subulatus var. ligulatus NE&GP;
southern pepperwort
LEAU3 Lepidium austrinum N SWSS
southern sandbur
CESP4 Cenchrus spinifex N
CEIN4 Cenchrus incertus STATE SWSS
southwestern cupgrass
ERACA Eriochloa acuminata var. acuminata N
ERGR4 Eriochloa gracilis SWSS WSWS
sow thistle
SOOL Sonchus oleraceus I N'EAST SWSS WSWS
soybean
GLMA4 Glycine max I SWSS
Spanish arborvine
METU2 Merremia tuberosa N FLEPPC
Spanish bayonet
YUGL Yucca glauca N NE&GP; WSWS
Spanish broom
SPJU2 Spartium junceum I STATE CalEPPC
Spanish gold
GRPA8 Grindelia papposa N
HACI5 Haplopappus ciliatus SWSS
Spanish needle
BIPI Bidens pilosa I HEAR
Spanish needles
BIBI7 Bidens bipinnata N NE&GP;
sparrow vetch
VITE Vicia tetrasperma I N'EAST
spear thistle
CIVU Cirsium vulgare I STATE CalEPPC NE&GP; N'EAST SEEPPC SWSS WSWS
spearmint
MESP3 Mentha spicata I SEEPPC
spearscale
ATSU2 Atriplex subspicata N NE&GP;
spiderflower
CLGY Cleome gynandra I SWSS
spiderwisp
CLGY Cleome gynandra I SWSS
spiked loosestrife
LYSA2 Lythrum salicaria I STATE CalEPPC NE&GP; N'EAST SEEPPC SWSS WI WSWS
spiked pepper
PIAD Piper aduncum N STATE
spiked water milfoil
MYSP2 Myriophyllum spicatum I STATE CalEPPC FLEPPC SEEPPC WI
spikeweed
HEPU5 Hemizonia pungens N STATE WSWS
spine tree cactus
CEHI3 Cereus hildmannianus I
CEUR Cereus uruguayanus STATE
spineless horsebrush
TECA2 Tetradymia canescens N WSWS
spiny amaranth
AMSP Amaranthus spinosus N KY SWSS
spiny amaranthus
AMSP Amaranthus spinosus N KY SWSS
spiny burrgrass
CESP4 Cenchrus spinifex N
CEIN4 Cenchrus incertus STATE SWSS
spiny cocklebur
XASP2 Xanthium spinosum I STATE SEEPPC SWSS WSWS
spiny plumeless thistle
CAAC Carduus acanthoides I STATE NE&GP; WI WSWS
spiny sowthistle
SOAS Sonchus asper I KY NE&GP; SWSS WSWS
spongeplant
LISP2 Limnobium spongia N STATE
spoonleaf purple everlasting
GAPU3 Gamochaeta purpurea N
GNPU2 Gnaphalium purpureum N'EAST
spotted beebalm
MOPE Monarda pectinata N NE&GP;
spotted catsear
HYRA3 Hypochaeris radicata I STATE HEAR WSWS
spotted cowbane
CIMA2 Cicuta maculata N STATE NE&GP;
spotted knapweed
CEBI2 Centaurea biebersteinii I STATE
CEMA4 Centaurea maculosa STATE CalEPPC KY NE&GP; N'EAST SEEPPC SWSS WI WSWS
spotted knapweed
CEME2 Centaurea melitensis I STATE CalEPPC
spotted parsley
CIMA2 Cicuta maculata N STATE NE&GP;
spotted sandmat
CHMA15 Chamaesyce maculata N
EUMA7 Euphorbia maculata NE&GP; N'EAST SWSS
EUMA7 Euphorbia maculata NE&GP; N'EAST SWSS
spotted thistle
SIMA3 Silybum marianum I STATE SWSS WSWS
spotted water hemlock
CIMA2 Cicuta maculata N STATE NE&GP;
sprangletop
LEFUF Leptochloa fusca ssp. fascicularis N SWSS
LEFA Leptochloa fascicularis NE&GP;
spreading dayflower
CODI5 Commelina diffusa N SWSS
spreading dogbane
APAN2 Apocynum androsaemifolium N WSWS
spreading orach
ATSU2 Atriplex subspicata N NE&GP;
spreading sandmat
CHHU3 Chamaesyce humistrata N
EUHU Euphorbia humistrata SEEPPC SWSS
EUHU Euphorbia humistrata SEEPPC SWSS
spreading wallflower
ERRE4 Erysimum repandum I SWSS
spreading yellowcress
ROSI2 Rorippa sinuata N NE&GP;
Sprenger asparagus
ASDE12 Asparagus densiflorus I FLEPPC HEAR
spring Whitlowgrass
DRVE2 Draba verna I KY
spurge
EUES Euphorbia esula I STATE CalEPPC NE&GP; N'EAST SWSS WI WSWS
spurge flax
THPA7 Thymelaea passerina I STATE
spurge laurel
DALA11 Daphne laureola I FLEPPC
spurred anoda
ANCR2 Anoda cristata N STATE KY SWSS WSWS
squarrose knapweed
CETR8 Centaurea triumfettii I
CESQ Centaurea squarrosa STATE
CEVI Centaurea virgata STATE
CEVIS Centaurea virgata var. squarrosa STATE WSWS
St. Anthony's turnip
RABU Ranunculus bulbosus I N'EAST
St. John's wort
HYPE Hypericum perforatum I STATE CalEPPC NE&GP; SEEPPC SWSS WI WSWS
staghorn sumac
RHHI2 Rhus hirta N
RHTY Rhus typhina N'EAST
star apple
CHCA10 Chrysophyllum cainito N HEAR
star-of-Bethlehem
ORUM Ornithogalum umbellatum I STATE KY N'EAST SEEPPC
starglory
IPCO3 Ipomoea coccinea I SWSS WSWS
State
EGDE Egeria densa I STATE CalEPPC HEAR NE&GP; SEEPPC WI WSWS
stawcolored flatsedge
CYST Cyperus strigosus N SWSS
stemless loco
OXLA3 Oxytropis lambertii N NE&GP;
steppenraute
PEHA Peganum harmala I STATE WSWS
sterile brome
BRST2 Bromus sterilis I SEEPPC
stickbush
CLCH4 Clerodendrum chinense I
CLPH Clerodendrum philippinum HEAR
sticktight
BICE Bidens cernua N NE&GP; WSWS
sticktights
BIFR Bidens frondosa N NE&GP; N'EAST
sticky cockle
SINO Silene noctiflora I NE&GP; SWSS
stinging nettle
URDI Urtica dioica NI NE&GP; SEEPPC WSWS
stinging nettle
URDIG Urtica dioica ssp. gracilis N
URDIP2 Urtica dioica var. procera N'EAST
stinkgrass
ERCI Eragrostis cilianensis I NE&GP; SWSS WSWS
stinking passionflower
PAFO2 Passiflora foetida NI FLEPPC
stinkvine
PAFO3 Paederia foetida I STATE FLEPPC
PASC15 Paederia scandans HEAR
stinkweed
ANCO2 Anthemis cotula I STATE KY NE&GP; N'EAST SWSS WSWS
stinkweed
GUSA2 Gutierrezia sarothrae N NE&GP; WSWS
stinkweed
TAMI3 Tagetes minuta I STATE
stinkweed
THAR5 Thlaspi arvense I KY NE&GP; N'EAST SWSS WSWS
stinkwort
DAST Datura stramonium I STATE KY NE&GP; N'EAST SWSS WSWS
stone clover
TRAR4 Trifolium arvense I N'EAST
stork's bill
ERCI6 Erodium cicutarium I STATE N'EAST SWSS WSWS
strawberry guava
PSCA Psidium cattleianum I FLEPPC HEAR
striate knotweed
POAC3 Polygonum achoreum N NE&GP;
strong-scented glorybower
CLBU Clerodendrum bungei I FLEPPC
strongscented lovegrass
ERCI Eragrostis cilianensis I NE&GP; SWSS WSWS
succory
CIIN Cichorium intybus I STATE KY NE&GP; N'EAST SEEPPC SWSS WSWS
sulfur cinquefoil
PORE5 Potentilla recta I STATE NE&GP; WSWS
sulphur knapweed
CESU Centaurea sulphurea I STATE
summer cypress
KOSC Kochia scoparia I STATE NE&GP; N'EAST SWSS WSWS
summer grape
VIAE Vitis aestivalis N N'EAST
sundial lupine
LUPE3 Lupinus perennis N SWSS
sunflower
HEAN3 Helianthus annuus N STATE NE&GP; SWSS WSWS
Surinam cherry
EUUN2 Eugenia uniflora I FLEPPC
Swainsonpea
SPSA3 Sphaerophysa salsula I STATE WSWS
swamp milkweed
ASIN Asclepias incarnata N NE&GP; WSWS
swamp morningglory
IPAQ Ipomoea aquatica I US STATE FLEPPC
swamp oak
CAGL11 Casuarina glauca I FLEPPC HEAR
swamp stonecrop
CRHE5 Crassula helmsii XU STATE
swamp verbena
VEHA2 Verbena hastata N WSWS
swampmahogany
EURO2 Eucalyptus robusta I HEAR
sweet acacia
ACFA Acacia farnesiana N HEAR
sweet Betty
SAOF4 Saponaria officinalis I STATE CalEPPC KY NE&GP; WSWS
sweet breath-of-spring
LOFR Lonicera fragrantissima I SEEPPC
sweet fennel
FOVU Foeniculum vulgare I CalEPPC
sweet granadilla
PALI8 Passiflora ligularis I HEAR
sweet pittosporum
PIUN2 Pittosporum undulatum I STATE HEAR
sweet resinbush
EUMU Euryops multifidus I
EUSUV Euryops subcarnosus ssp. vulgaris STATE
swinecress
COSQ Coronopus squamatus I STATE
switchgrass
PAVI2 Panicum virgatum N SWSS
swollen bladderwort
UTIN Utricularia inflata N STATE
sword fern
NECO3 Nephrolepis cordifolia I FLEPPC
swordgrass
MIFL3 Miscanthus floridulus I STATE
Syrian beancaper
ZYFA Zygophyllum fabago I STATE
Syrian mesquite
PRFA2 Prosopis farcta I US STATE
Syrian rue
PEHA Peganum harmala I STATE WSWS

*N =Native, N? =probably native, NI=some populations native, some introduced, I =Introduced, I? =probably introduced, XU = Not in US or cultivated, ? =unknown.

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