Introduced Plants of the U.S. Click on an accepted name below to view its Plant Profile with all synonyms, distribution map, more information, and web links if available.

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Symbol Scientific Name Common Name NADO Nandina domestica Thunb. sacred bamboo NENU2 Nelumbo nucifera Gaertn. sacred lotus CATI Carthamus tinctorius L. safflower CYRE11 Cycas revoluta Thunb. sago palm ONVI Onobrychis viciifolia Scop. sainfoin CLJA6 Cleyera japonica Thunb. sakaki TRPO Tragopogon porrifolius L. salsify TARA Tamarix ramosissima Ledeb. saltcedar HAGL Halogeton glomeratus (Bieb.) C.A. Mey. saltlover CHMAH Chenopodium macrospermum Hook. f. var. halophilum (Phil.) Standl. saltloving goosefoot LIOT Limonium otolepis (Schrenk) Kuntze saltmarsh sealavender ECPL Echium plantagineum L. salvation jane CISA Cistus salviifolius L. salvia cistus OLSA Oldenlandia salzmannii (DC.) Benth. & Hook. f. ex B.D. Jackson Salzmann's mille graines ALSC3 Allium scorodoprasum L. sand leek PLPS Plantago psyllium L. sand plantain LEAR11 Leymus arenarius (L.) Hochst. sand ryegrass PHAR4 Phleum arenarium L. sand timothy PAHY Parthenium hysterophorus L. Santa Maria feverfew MAZA Manilkara zapota (L.) van Royen sapodilla VIHO80 Vigna hosei (Craib) Backer Sarawak bean CASA26 Camellia sasanqua Thunb. Sasanqua camellia KIAF Kigelia africana (Lam.) Benth. sausage tree DYBR Dyckia brevifolia Baker sawblade QUAC80 Quercus acutissima Carruthers sawtooth oak PESA9 Petrorhagia saxifraga (L.) Link saxifrage pink BECO Begonia coccinea Hook. scarlet begonia PYCO2 Pyracantha coccinea M. Roemer scarlet firethorn PEIN7 Pelargonium inquinans (L.) L'Hér. ex Ait. scarlet geranium IXCO Ixora coccinea L. scarlet jungleflame PACO17 Passiflora coccinea Aubl. scarlet passionflower ANAR Anagallis arvensis L. scarlet pimpernel ANARA7 Anagallis arvensis L. ssp. arvensis scarlet pimpernel PHCO6 Phaseolus coccineus L. scarlet runner SASP6 Salvia splendens Sellow ex Roemer & J.A. Schultes scarlet sage PAFOI Passiflora foetida L. var. isthmia Killip scarletfruit passionflower TRPE21 Tripleurospermum perforata (Merat) M. Lainz scentless false mayweed PEIN6 Pelargonium inodorum Willd. scentless geranium BASC4 Bahia schaffneri S. Wats. Schaffner's bahia ELSC8 Eleocharis schaffneri Boeckl. Schaffner's spikerush LESC3 Lepidium schinzii Thellung Schinz's pepperweed GASC2 Galium schultesii Vest Schultes' bedstraw CARE22 Carmona retusa (Vahl) Masamune scorpionbush ONAC Onopordum acanthium L. Scots cottonthistle ERCI3 Erica cinerea L. Scots heath PISY Pinus sylvestris L. Scots pine ROSP2 Rosa spinosissima L. Scots rose CYSC4 Cytisus scoparius (L.) Link scotsbroom CYSCA Cytisus scoparius (L.) Link var. andreanus (Puiss.) Dippel scotsbroom CYSCS2 Cytisus scoparius (L.) Link var. scoparius scotsbroom GASY Galium sylvaticum L. scotsmist SOTA3 Solanum tampicense Dunal scrambling nightshade TRPA26 Tripolium pannonicum (Jacq.) Dobrocz. sea aster TRSQ Trifolium squamosum L. sea clover CACH38 Carpobrotus chilensis (Molina) N.E. Br. sea fig HITI Hibiscus tiliaceus L. sea hibiscus CRMA Crambe maritima L. sea kale JUMA5 Juncus maritimus Lam. sea rush EUPA13 Euphorbia paralias L. sea spurge HIRH80 Hippophae rhamnoides L. seabuckthorn CHOP Chenopodium opulifolium Schrad. ex Koch & Ziz seaport goosefoot IRSP80 Iris spuria L. seashore iris IRSPO Iris spuria L. ssp. ochroleuca (L.) Dykes seashore iris VELI Verbena litoralis Kunth seashore vervain PUMA Puccinellia maritima (Huds.) Parl. seaside alkaligrass HOMA2 Hordeum marinum Huds. seaside barley HOMAM Hordeum marinum Huds. ssp. marinum seaside barley SAVA3 Samolus valerandi L. seaside brookweed‡ SAVAV Samolus valerandi L. ssp. valerandi seaside brookweed DISE10 Diodia serrulata (Beauv.) G. Taylor seaside buttonweed DELI4 Delosperma litorale (Kensit) L. Bolus seaside delosperma ERMA7 Eryngium maritimum L. seaside eryngo CHSE17 Chamaedorea seifrizii Burret Seifriz's chamaedorea PHRE Phoenix reclinata Jacq. Senegal date palm KHSE2 Khaya senegalensis (Desr.) A. Juss. Senegal mahogany CADI8 Carex divisa Huds. separated sedge SEOC2 Senna occidentalis (L.) Link septicweed EUSE12 Euphorbia serrata L. serrate spurge SEOR4 Sesamum orientale L. sesame TESE3 Tephrosia sessiliflora (Poir.) Hassler sessileflower hoarypea BLSE2 Blumea sessiliflora Dcne. sessileleaf false oxtongue PACR15 Paederia cruddasiana Prain sewer vine CIMA5 Citrus maxima (Burm. f.) Merr. shaddock GAQU Galinsoga quadriradiata Cav. shaggy-soldier FRUH Fraxinus uhdei (Wenzig) Lingelsh. shamel ash ERLE20 Eriochloa leersioides (Munro) Hack. sharp cupgrass† GYAC Gypsophila acutifolia Stev. ex Spreng. sharpleaf babysbreath KIEL Kickxia elatine (L.) Dumort. sharpleaf cancerwort FEOV Festuca ovina L. sheep fescue JAMO Jasione montana L. sheepbit MOLA Moluccella laevis L. shellflower ALZE Alpinia zerumbet (Pers.) Burtt & R.M. Sm. shellplant CABU2 Capsella bursa-pastoris (L.) Medik. shepherd's purse SCPE Scandix pecten-veneris L. shepherdsneedle POSC10 Polyscias scutellaria (Burm. f.) Fosberg shield aralia HEME4 Heliconia metallica Planch. & Linden ex Hook. shining bird of paradise GELU Geranium lucidum L. shining geranium EULU2 Euphorbia lucida Waldst. & Kit. shining spurge CONI15 Corispermum nitidum Kit. ex J.A. Schultes shiny bugseed COLU5 Cotoneaster lucidus Schldl. shiny cotoneaster HIRO3 Hibiscus rosa-sinensis L. shoebackplant AREL4 Ardisia elliptica Thunb. shoebutton CADE15 Caesalpinia decapetala (Roth) Alston shoofly SCAU7 Scrophularia auriculata L. shoreline figwort ACBR5 Achnatherum brachychaetum (Godr.) Barkworth shortbristled needlegrass SIPO2 Sisymbrium polyceratium L. shortfruit hedgemustard ERBR14 Erodium brachycarpum (Godr.) Thellung shortfruit stork's bill EUAP Eugenia apiculata DC. shortleaf stopper HIIN3 Hirschfeldia incana (L.) Lagrèze-Fossat shortpod mustard PHBR3 Phalaris brachystachys Link shortspike canarygrass CASI10 Calystegia silvatica (Kit.) Griseb. shortstalk false bindweed‡ CASIS Calystegia silvatica (Kit.) Griseb. ssp. silvatica shortstalk false bindweed GYEL Gypsophila elegans Bieb. showy babysbreath CAGR13 Cardiospermum grandiflorum Sw. showy balloonvine RAACA3 Ranunculus acris L. var. acris showy buttercup TASP4 Taraxacum spectabile Dahlst. showy dandelion DRFL2 Drosanthemum floribundum (Haw.) Schwant. showy dewflower FOIN3 Forsythia ×intermedia Zabel [suspensa × viridissima] showy forsythia VESP Verbascum speciosum Schrad. showy mullein CRSP2 Crotalaria spectabilis Roth showy rattlebox HYSP9 Hylotelephium spectabile (Boreau) H. Ohba. showy stonecrop JUBR6 Justicia brandegeeana Wasshausen & L.B. Sm. shrimpplant OSFR4 Osteospermum fruticosum (L.) Norl. shrubby daisybush DISU11 Dillenia suffruticosa (Griffith) Martelli shrubby dillenia SPVE2 Spermacoce verticillata L. shrubby false buttonweed FUPA2 Fuchsia paniculata Lindl. shrubby fuchsia TEFR3 Teucrium fruticans L. shrubby germander PHFR4 Phlomis fruticosa L. shrubby Jerusalem sage AEEV Aeschynomene evenia C. Wright shrubby jointvetch LEBI2 Lespedeza bicolor Turcz. shrubby lespedeza ONSU2 Oncosiphon suffruticosum (L.) Källersjö shrubby mayweed SORO3 Solanum robustum Wendl. shrubby nightshade STFR80 Stylosanthes fruticosa (Retz.) Alston shrubby pencilflower SAVE6 Salsola vermiculata L. shrubby Russian thistle SASP7 Sanchezia speciosa Leonard shrubby whitevein SESI3 Senna siamea (Lam.) Irwin & Barneby Siamese cassia COPA38 Corispermum pallasii Steven Siberian bugseed MABA Malus baccata (L.) Borkh. Siberian crabapple RUSI Rumex sibiricus Hultén Siberian dock ULPU Ulmus pumila L. Siberian elm GESI2 Geranium sibiricum L. Siberian geranium COHE12 Corylus heterophylla Fisch. & Trautv. Siberian hazelnut IRSI Iris sibirica L. Siberian iris DEGR80 Delphinium grandiflorum L. Siberian larkspur MEAL Melica altissima L. Siberian melicgrass SOSA3 Sorbus sambucifolia (Cham. & Schlecht.) M. Roemer Siberian mountain ash CAAR18 Caragana arborescens Lam. Siberian peashrub CRSI5 Crassula sieberiana (J.A. Schultes) Druce Siberian pygmyweed ATSI2 Atriplex sibirica L. Siberian saltbush ARSI5 Argusia sibirica (L.) Dandy Siberian sea rosemary SCSI2 Scilla siberica Haw. Siberian squill AGFR Agropyron fragile (Roth) P. Candargy Siberian wheatgrass SETO4 Senna tora (L.) Roxb. sickle senna EUFA2 Euphorbia falcata L. sickle spurge TRFO80 Trigonella foenum-graecum L. sicklefruit fenugreek HYIM Hypecoum imberbe Sm. sicklefruit hypecoum FAVU Falcaria vulgaris Bernh. sickleweed CRSI6 Crocus sieberi J. Gay Sieber's crocus VISI Viburnum sieboldii Miq. Siebold's arrowwood HYPA6 Hypericum parvulum Greene Sierra Madre St. Johnswort PHLU2 Phaseolus lunatus L. sieva bean COVI Cochlospermum vitifolium (Willd.) Willd. ex Spreng. silk cottontree LAMO5 Lagascea mollis Cav. silkleaf GRRO Grevillea robusta A. Cunningham ex R. Br. silkoak NERE Neyraudia reynaudiana (Kunth) Keng ex A.S. Hitchc. silkreed FUEL Funtumia elastica (Preuss) Stapf silkrubber ALJU Albizia julibrissin Durazz. silktree PEGR9 Periploca graeca L. silkvine DISE5 Dichanthium sericeum (R. Br.) A. Camus silky bluestem CASE9 Canavalia sericea Gray silky jackbean THVI2 Themeda villosa (Poir.) A. Camus silky kangaroo grass HYDR4 Hyparrhenia dregeana (Nees) Stent silky thatching grass SASM2 Salix ×smithiana Willd. (pro sp.) [cinerea × viminalis] silky-leaf osier BOLAL2 Bothriochloa laguroides (DC.) Herter ssp. laguroides silver beardgrass POAR8 Potentilla argentea L. silver cinquefoil POARA3 Potentilla argentea L. var. argentea silver cinquefoil POARP2 Potentilla argentea L. var. pseudocalabra T. Wolf silver cinquefoil AICA Aira caryophyllea L. silver hairgrass CRAR5 Croton argenteus L. silver July croton SEBI4 Senecio bicolor (Willd.) Todaro silver ragwort SEBIC Senecio bicolor (Willd.) Todaro ssp. cineraria (DC.) Chater silver ragwort SAAR25 Salvia argentea L. silver sage SEAR13 Senna artemisioides (Gaud. ex DC.) Randell silver senna ACDE3 Acacia dealbata Link silver wattle COPA14 Cotoneaster pannosus Franch. silverleaf cotoneaster EUPU Eucalyptus pulverulenta Sims silverleaf mountain gum POAR5 Polygonum argyrocoleon Steud. ex Kunze silversheath knotweed ARSI6 Arundinaria simonii (Carr.) A.& C. Rivière Simon bamboo COSI82 Cotoneaster simonsii Baker Simons' cotoneaster SIRO3 Sideritis romana L. simplebeak ironwort FLAC Flueggea acidoton (L.) G.L. Webster simpleleaf bushweed VITR7 Vitex trifolia L. simpleleaf chastetree VITRB Vitex trifolia L. var. bicolor (Willd.) Moldenke simpleleaf chastetree VITRS Vitex trifolia L. var. subtrisecta (Kuntze) Moldenke simpleleaf chastetree VITRT Vitex trifolia L. var. trifolia simpleleaf chastetree ARSI4 Arachniodes simplicior (Makino) Ohwi simpler hollyfern CEUN2 Centaurea uniflora Turra singleflower knapweed CEUNN Centaurea uniflora Turra ssp. nervosa (Willd.) Bonnier & Layens singleflower knapweed LUAC2 Luffa acutangula (L.) Roxb. sinkwa towelsponge AGSI2 Agave sisalana Perrine sisal hemp ORUM Ornithogalum umbellatum L. sleepydick LOAN2 Lotus angustissimus L. slender bird's-foot trefoil DITE10 Dichanthium tenue (R. Br.) A. Camus slender bluestem PTEN Pteris ensiformis Burm. f. slender brake MOGR3 Mollugo gracillima Anderss. slender carpetweed CEGR7 Cerastium gracile Dufour slender chickweed EVALD Evolvulus alsinoides (L.) L. var. debilis (Kunth) van Ooststr. slender dwarf morning-glory BRSY Brachypodium sylvaticum (Huds.) Beauv. slender false brome NOGR3 Nothoscordum gracile (Ait.) Stearn slender false garlic GAGR4 Galphimia gracilis Bartl. slender goldshower CROC80 Crotalaria ochroleuca G. Don slender leaf rattlebox ALMY Alopecurus myosuroides Huds. slender meadow foxtail AVBA Avena barbata Pott ex Link slender oat APMI Aphanes microcarpa (Boiss. & Reut.) Rothm. slender parsley piert SACO8 Salsola collina Pallas slender Russian thistle BRLE5 Bromus lepidus Holmb. slender soft brome SOTE3 Sonchus tenerrimus L. slender sowthistle VILA16 Vicia laxiflora Brot. slender vetch CLGR4 Clinopodium gracile (Benth.) Kuntze slender wild basil MENO2 Mesembryanthemum nodiflorum L. slenderleaf iceplant ERGA2 Eragrostis gangetica (Roxb.) Steud. slimflower lovegrass CYGR9 Cyperus gracilis R. Br. slimjim flatsedge ANAR16 Anchusa arvensis (L.) Bieb. small bugloss SAMI3 Sanguisorba minor Scop. small burnet SAMIM Sanguisorba minor Scop. ssp. muricata (Spach) Nordborg small burnet ARHI3 Arthraxon hispidus (Thunb.) Makino small carpgrass SPMA6 Spartina maritima (M.A. Curtis) Fern. small cordgrass HEMI17 Hemerocallis minor P. Mill. small daylily GEPU2 Geranium pusillum L. small geranium ACCO Acacia confusa Merr. small Philippine acacia ATEA Atriplex eardleyae Aellen small saltbush ALMU2 Alpinia mutica Roxb. small shell ginger SILO3 Sisymbrium loeselii L. small tumbleweed mustard TRNI3 Trifolium nigrescens Viviani small white clover LYMI Lygodium microphyllum (Cav.) R. Br. small-leaf climbing fern TRFL Tradescantia fluminensis Vell. small-leaf spiderwort CYMI3 Cynoglossum microglochin Benth. smallbristle hound's tongue BRPA15 Bruguiera parviflora (Roxb.) Wight & Arn. ex Griffith smallflower bruguiera RAPA3 Ranunculus parviflorus L. smallflower buttercup VIPA6 Vitex parviflora Juss. smallflower chastetree EPPA5 Epilobium parviflorum Schreb. smallflower hairy willowherb CRPU3 Crepis pulchra L. smallflower hawksbeard INPA Indigofera ?parviflora K. Heyne ex Wight & Arn. smallflower indigo ERPA32 Eragrostis parviflora (R. Br.) Trin. smallflower lovegrass PIPA9 Picris pauciflora Willd. smallflower oxtongue ROMI Rosa micrantha Borrer ex Sm. smallflower sweetbrier TAPA4 Tamarix parviflora DC. smallflower tamarisk HYMI5 Hypochaeris microcephala (Schultz-Bip.) Cabrera smallhead catsear HYMIA Hypochaeris microcephala (Schultz-Bip.) Cabrera var. albiflora (Kuntze) Cabrera smallhead catsear CECA5 Centaurea calcitrapoides L. smallhead star-thistle ECCO10 Echium coincyanum Lacaita smallstamen vipersbugloss EROD2 Erysimum odoratum Ehrh. smelly wallflower PIMI3 Piptatherum miliaceum (L.) Coss. smilograss BUMA80 Buddleja madagascariensis Lam. smokebush DAIN7 Datura inermis Jacq. smoooth thorn-apple HOMUG Hordeum murinum L. ssp. glaucum (Steud.) Tzvelev smooth barley CRLA13 Cruciata laevipes Opiz smooth bedstraw SCAP3 Schoenus apogon Roemer & J.A. Schultes smooth bogrush BRIN2 Bromus inermis Leyss. smooth brome‡ BRIND Bromus inermis Leyss. ssp. inermis var. divaricatus Rohlena smooth brome BRINI Bromus inermis Leyss. ssp. inermis smooth brome BRINI2 Bromus inermis Leyss. ssp. inermis var. inermis smooth brome HYGL2 Hypochaeris glabra L. smooth catsear VIGL2 Vitex glabrata R. Br. smooth chastetree DIIS Digitaria ischaemum (Schreb.) Schreb. ex Muhl. smooth crabgrass CRCA3 Crepis capillaris (L.) Wallr. smooth hawksbeard CRLA80 Crataegus laevigata (Poir.) DC. smooth hawthorn ALPA17 Alternanthera paronichyoides St.-Hil. smooth joyweed‡ ALPAA2 Alternanthera paronichyoides St.-Hil. var. amazonica Huber smooth joyweed PRLA6 Prosopis laevigata (Humb. & Bonpl. ex Willd.) M.C. Johnston smooth mesquite CRPA10 Crotalaria pallida Ait. smooth rattlebox CRPAO Crotalaria pallida Ait. var. obovata (G. Don) Polhill smooth rattlebox HEGL8 Herniaria glabra L. smooth rupturewort SESU10 Senna sulfurea (DC. ex Colladon) Irwin & Barneby smooth senna VILU2 Vicia lutea L. smooth yellow vetch SPIN4 Sporobolus indicus (L.) R. Br. smut grass‡ MESC6 Medicago scutellata (L.) P. Mill. snail medick ACPT Achillea ptarmica L. sneezeweed CETO2 Cerastium tomentosum L. snow in summer BRDI8 Breynia disticha J.R. & G. Forst. snowbush GANI Galanthus nivalis L. snowdrop RUNI4 Rubus niveus Thunb. snowpeaks raspberry SEFO2 Serissa foetida (L. f.) Lam. snowrose LIFO Libertia formosa Graham snowy mermaid BRHO2 Bromus hordeaceus L. soft brome BRHOH Bromus hordeaceus L. ssp. hordeaceus soft brome BRHOM Bromus hordeaceus L. ssp. molliformis (Lloyd) Maire & Weiller soft brome BRHOP Bromus hordeaceus L. ssp. pseudothominii P. Sm. soft brome BRHOT Bromus hordeaceus L. ssp. thominei (Hardham ex Nyman) Braun-Blanquet soft brome ENMO Enneapogon mollis Lehm. soft feather pappusgrass INPI Indigofera pilosa Poir. softhairy indigo GESO Geranium solanderi Carolin Solander's geranium ZEST Zeuxine strateumatica (L.) Schlechter soldier's orchid PISA Pimpinella saxifraga L. solidstem burnet saxifrage PISAN Pimpinella saxifraga L. ssp. nigra (P. Mill.) Gaudin solidstem burnet saxifrage PISAS Pimpinella saxifraga L. ssp. saxifraga solidstem burnet saxifrage SOBI2 Sorghum bicolor (L.) Moench sorghum PRCE Prunus cerasus L. sour cherry CIAU2 Citrus aurantium L. sour orange ERPL Eragrostis plana Nees South African lovegrass KAPU2 Karroochloa purpurea (L. f.) Conert & Türpe South African oatgrass RIHU3 Richardia humistrata (Cham. & Schlecht.) J.A. & J.H. Schultes South American Mexican clover GLPU3 Glandularia pulchella (Sweet) Troncoso South American mock vervain JAPL Jarava plumosa (Spreng.) S.L.W. Jacobs & J. Everett South American rice grass HYAN Hymenoxys anthemoides (Juss.) Cass. South American rubberweed ATLA2 Atriplex lampa (Moq.) Gillies ex Small South American saltbush SCRA Scutellaria racemosa Pers. South American skullcap NISY Nicotiana sylvestris Speg. & Comes South American tobacco ACPA81 Acacia parramattensis Tindale South Wales wattle MOBA Momordica balsamina L. southern balsampear ECRI Echinops rito L. southern globethistle ECRIR Echinops rito L. ssp. ruthenicus (Bieb.) Nyman southern globethistle EUBO2 Eucalyptus botryoides Sm. southern mahogany METU Medicago turbinata (L.) All. southern medick WAMA Wahlenbergia marginata (Thunb.) A. DC. southern rockbell ACXA Acanthospermum xanthioides DC. southern starburr SUIN2 Succisella inflexa (Kluk) G. Beck southern succisella EMAU Emex australis Steinh. southern threecornerjack ARAB2 Artemisia abrotanum L. southernwood GLMA4 Glycine max (L.) Merr. soybean CEAS Centella asiatica (L.) Urban spadeleaf SPJU2 Spartium junceum L. Spanish broom PUPA6 Pulicaria paludosa Link Spanish false fleabane ERLU6 Erica lusitanica K. Rudolphi Spanish heath IRXI Iris xiphium L. Spanish iris MEBI Melicoccus bijugatus Jacq. Spanish lime SAHI6 Salvia hispanica L. Spanish sage SEHI Sedum hispanicum L. Spanish stonecrop LIAN5 Lindernia antipoda (L.) Alston sparrow false pimpernel LYPO4 Lythrum portula (L.) D.A. Webber spatulaleaf loosestrife PAHA5 Pavonia hastata Cav. spearleaf swampmallow MESP3 Mentha spicata L. spearmint ASCA41 Asplenium caudatum G. Forst. speenwort TRSP3 Triticum spelta L. spelt PTMU Pteris multifida Poir. spider brake CLGY Cleome gynandra L. spiderwisp MYSP2 Myriophyllum spicatum L. spike watermilfoil CESP3 Centaurium spicatum (L.) Fritsch spiked centaury VESP80 Veronica spicata L. spiked speedwell SPOL Spinacia oleracea L. spinach XASP2 Xanthium spinosum L. spiny cockleburr CASP11 Caesalpinia spinosa (Molina) Kuntze spiny holdback CAAC Carduus acanthoides L. spiny plumeless thistle ONCA2 Ononis campestris G. Koch & Ziz spiny restharrow SOAS Sonchus asper (L.) Hill spiny sowthistle EMSP Emex spinosa (L.) Campd. spiny threecornerjack RAMU2 Ranunculus muricatus L. spinyfruit buttercup ERFO5 Eryngium foetidum L. spiritweed GABI3 Galeopsis bifida Boenn. splitlip hempnettle LUAE Luffa aegyptiaca P. Mill. sponge gourd IXMA Ixia maculata L. spotted African cornlily RORE Roemeria refracta DC. spotted Asian poppy CAPU20 Campanula punctata Lam. spotted bellflower ZAAL Zantedeschia albomaculata (Hook.) Baill. spotted calla lily SCMA5 Scolymus maculatus L. spotted goldenthistle HIMA3 Hieracium maculatum Sm. spotted hawkweed LAMA Lamium maculatum L. spotted henbit CEBI2 Centaurea biebersteinii DC. spotted knapweed POPE3 Polygonum persicaria L. spotted ladysthumb† MEAR Medicago arabica (L.) Huds. spotted medick IMBA Impatiens balsamina L. spotted snapweed GAHU3 Galium humifusum Bieb. spreading bedstraw CAPA44 Campanula patula L. spreading bellflower SIIR2 Sisyrinchium iridifolium Kunth spreading blue-eyed grass POPRI2 Poa pratensis L. ssp. irrigata (Lindm.) Lindb. f. spreading bluegrass SIAB Sida abutifolia P. Mill. spreading fanpetals TOAR Torilis arvensis (Huds.) Link spreading hedgeparsley TOARA Torilis arvensis (Huds.) Link ssp. arvensis spreading hedgeparsley TOARP Torilis arvensis (Huds.) Link ssp. purpurea (Ten.) Hayek spreading hedgeparsley PADI27 Paspalidium distans (Trin.) Hughes spreading panicgrass PAJU Parietaria judaica L. spreading pellitory CEMI5 Centipeda minima (L.) A. Braun & Aschers. spreading sneezeweed CLDI4 Cleome diffusa Banks ex DC. spreading spiderflower LEDI29 Leptochloa divaricatissima S.T. Blake spreading sprangletop ERRE4 Erysimum repandum L. spreading wallflower CHDI2 Chloris divaricata R. Br. spreading windmill grass ASDE12 Asparagus densiflorus (Kunth) Jessop Sprenger's asparagus fern DRVE2 Draba verna L. spring draba COSO6 Corydalis solida (L.) Clairv. spring fumewort MIVE3 Milium vernale Bieb. spring milletgrass ADVE Adonis vernalis L. spring pheasant's eye LEVE3 Leucojum vernum L. spring snowflake VEVE Veronica verna L. spring speedwell VILA2 Vicia lathyroides L. spring vetch JAIN2 Jaborosa integrifolia Lam. springblossom TRUN6 Tristagma uniflorum (Lindl.) Traub springstar DALA11 Daphne laureola L. spurgelaurel BUSA Buddleja saligna Willd. squarestem butterflybush CETR8 Centaurea triumfettii All. squarrose knapweed JUBE2 Justicia betonica L. squirrel's tail ECEL Ecballium elaterium (L.) A. Rich. squirting cucumber RABU Ranunculus bulbosus L. St. Anthony's turnip ARSU6 Aristida suringarii Henr. St. Eustatius threeawn CESI3 Ceratonia siliqua L. St. John's bread ENPH Entada phaseoloides (L.) Merr. St. Thomas bean OPTU8 Operculina turpethum (L.) Silva Manso St. Thomas lidpod‡ OPTUV Operculina turpethum (L.) Silva Manso var. ventricosa (Bertero) Austin & Staples St. Thomas lidpod BATO Bauhinia tomentosa L. St. Thomas tree STAR Stachys arvensis (L.) L. staggerweed TRRA Tragus racemosus (L.) All. stalked burr grass ISTI3 Ischaemum timorense Kunth stalkleaf murainagrass LOST2 Lonicera standishii Jacques Standish's honeysuckle GECR6 Gentiana cruciata L. star gentian JAMU2 Jasminum multiflorum (Burm. f.) Andr. star jasmine MAST6 Magnolia stellata (Sieb. & Zucc.) Maxim. star magnolia GAFI6 Gagea fistulosa Ker-Gawl. Star of Bethlehem COMO9 Coincya monensis (L.) Greuter & Burdet star-mustard COMOR Coincya monensis (L.) Greuter & Burdet ssp. recurvata (All.) Leadley star-mustard MUNE Muscari neglectum Guss. ex Ten. starch grape hyacinth SCST Scabiosa stellata L. starflower pincushions CYPL2 Cynodon plectostachyus (K. Schum.) Pilger stargrass HYCO8 Hygrophila corymbosa (Blume) Lindau starhorn BEHE2 Begonia heracleifolia Cham. & Schlecht. starleaf begonia LILE8 Limonium leptostachyum (Boiss.) Kuntz statice ERST6 Erodium stephenianum Willd. Stephen's stork's bill CLCH4 Clerodendrum chinense (Osb.) Mabberley stickbush CEGL2 Cerastium glomeratum Thuill. sticky chickweed ERGL6 Eragrostis glutinosa (Sw.) Trin. sticky lovegrass SOSI Solanum sisymbriifolium Lam. sticky nightshade HEVI12 Heteranthemis viscidehirta Schott sticky oxeye SEVI2 Senecio viscosus L. sticky ragwort SAGL12 Salvia glutinosa L. sticky sage AGAD2 Ageratina adenophora (Spreng.) King & H.E. Robins. sticky snakeroot CUGL4 Cuphea glutinosa Cham. & Schlecht. sticky waxweed PICR Pittosporum crassifolium Banks & Soland. ex A. Cunningham stiffleaf cheesewood POCU7 Polemonium cuspidatum Sieb. & Zucc. stiffpoint Jacob's-ladder URDI Urtica dioica L. stinging nettle‡ URDID Urtica dioica L. ssp. dioica stinging nettle ERCI Eragrostis cilianensis (All.) Vign. ex Janchen stinkgrass ANCO2 Anthemis cotula L. stinking chamomile CHVU Chenopodium vulvaria L. stinking goosefoot CRFO2 Crepis foetida L. stinking hawksbeard OSCA Osteospermum calendulaceum L. f. stinking roger HEFO4 Helichrysum foetidum (L.) Cass. stinking strawflower SEJA Senecio jacobaea L. stinking willie ONPI Oncosiphon piluliferum (L. f.) Källersjö stinknet PAFO3 Paederia foetida L. stinkvine DIGR3 Dittrichia graveolens (L.) W. Greuter stinkwort SEST8 Sedum stoloniferum Gmel. stolon stonecrop IRAP Iris aphylla L. stool iris CUTR2 Cudrania tricuspidata (Carr.) Bureau ex Lavallée storehousebush CAVI2 Calyptocarpus vialis Less. straggler daisy COLI6 Corrigiola litoralis L. strapwort DILU Digitalis lutea L. straw foxglove POFR7 Potentilla fragiformis Willd. ex Schlecht. strawberry cinquefoil TRFR2 Trifolium fragiferum L. strawberry clover PHAL5 Physalis alkekengi L. strawberry groundcherry PSCA Psidium cattleianum Sabine strawberry guava RUIL Rubus illecebrosus Focke strawberry raspberry MUCA4 Muntingia calabura L. strawberrytree SCTR5 Schoenoplectus triqueter (L.) Palla streambank bulrush CYST7 Cytisus striatus (Hill) Rothm. striated broom MYST2 Myosotis stricta Link ex Roemer & J.A. Schultes strict forget-me-not PAST20 Parapholis strigosa (Dumort.) C.E. Hubbard strigose sicklegrass SESA Sedum sarmentosum Bunge stringy stonecrop SICO3 Silene conica L. striped corn catchfly CRZA2 Crepis zacintha (L.) Babcock striped hawksbeard LIRE3 Linaria repens (L.) P. Mill. striped toadflax TRSU3 Trifolium subterraneum L. subterranean clover TRCR6 Tradescantia crassula Link & Otto succulent spiderwort TRDU2 Trifolium dubium Sibthorp suckling clover DAGE Dactyloctenium germinatum Hack. Sudan crowfoot grass SOBID Sorghum bicolor (L.) Moench ssp. drummondii (Nees ex Steud.) de Wet & Harlan Sudangrass SAOF Saccharum officinarum L. sugarcane EUCL Eucalyptus cladocalyx F. Muell. sugargum PORE5 Potentilla recta L. sulphur cinquefoil COSU5 Cosmos sulphureus Cav. sulphur cosmos CESU Centaurea sulphurea Willd. sulphur knapweed FIAE Fimbristylis aestivalis (Retz.) Vahl summer fimbry ADAE Adonis aestivalis L. summer pheasant's eye SECL3 Senecio clivorum Maxim. summer ragwort SAHO3 Satureja hortensis L. summer savory LEAE Leucojum aestivum L. summer snowflake LEAEA Leucojum aestivum L. ssp. aestivum summer snowflake LEAEP Leucojum aestivum L. ssp. pulchellum (Salisb.) Briq. summer snowflake ALCI3 Alloteropsis cimicina (L.) Stapf summergrass CRJU Crotalaria juncea L. sunn hemp EUUN2 Eugenia uniflora L. Surinam cherry CASU33 Calliandra surinamensis Benth. Surinamese stickpea IPAQ Ipomoea aquatica Forsk. swamp morning-glory CRSC Crypsis schoenoides (L.) Lam. swamp pricklegrass AMSC4 Amphibromus scabrivalvis (Trin.) Swallen swamp wallaby grass EURO2 Eucalyptus robusta Sm. swampmahogany ARER Aristolochia erecta L. swanflower ARSW Aristida swartziana Steud. Swartz's threeawn PRDU Prunus dulcis (P. Mill.) D.A. Webber sweet almond LOMA Lobularia maritima (L.) Desv. sweet alyssum CLTE4 Clematis terniflora DC. sweet autumn virginsbower OCBA Ocimum basilicum L. sweet basil LANO80 Laurus nobilis L. sweet bay LOFR Lonicera fragrantissima Lindl. & Paxton sweet breath of spring PRAV Prunus avium (L.) L. sweet cherry FOVU Foeniculum vulgare P. Mill. sweet fennel PALI8 Passiflora ligularis Juss. sweet granadilla IRPA2 Iris pallida Lam. sweet iris ORMA Origanum majorana L. sweet marjoram PHCO7 Philadelphus coronarius L. sweet mock orange CISI Citrus sinensis (L.) Osbeck sweet orange ARAN3 Artemisia annua L. sweet sagewort PEGR11 Pelargonium graveolens L'Hér. ex Ait. sweet scented geranium BRER Brachiaria eruciformis (Sm.) Griseb. sweet signalgrass ANOD Anthoxanthum odoratum L. sweet vernalgrass VIOD Viola odorata L. sweet violet SIAR Silene armeria L. sweet William silene ACAG3 Achillea ageratum L. sweet yarrow ROEG Rosa eglanteria L. sweetbriar rose LAOD Lathyrus odoratus L. sweetpea IPBA2 Ipomoea batatas (L.) Lam. sweetpotato GAOD3 Galium odoratum (L.) Scop. sweetscented bedstraw PHDU3 Phyllostachys dulcis McClure sweetshoot bamboo AMMO Amberboa moschata (L.) DC. sweetsultan DIBA Dianthus barbatus L. sweetwilliam CAGL15 Canavalia gladiata (Jacq.) DC. sword jackbean MATO3 Macrothelypteris torresiana (Gaud.) Ching swordfern ACPS Acer pseudoplatanus L. sycamore maple EUSA Eucalyptus saligna Sm. Sydney bluegum ACLO Acacia longifolia (Andr.) Willd. Sydney golden wattle ZYFA Zygophyllum fabago L. Syrian beancaper CESY Cephalaria syriaca (L.) Scrad. ex Roemer & J.A. Schultes Syrian cephalaria PRFA2 Prosopis farcta (Banks & Soland.) J.F. Macbr. Syrian mesquite EUSY Euclidium syriacum (L.) Ait. f. Syrian mustard BEPLS Betula platyphylla Sukatschev var. szechuanica Schneid. Szechuan white birch ALSZ2 Alyssum szovitsianum Fisch. & C.A. Mey. Szowits' madwort

† Probably introduced to the U.S.

‡ Some populations in the U.S. are native and others are introduced from other countries

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