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- Šabankuk (Chippewa) 1932 (105)
- Possibly, Lonicera dioica L. [reported as: Lonicera divica L]
- Sabarina 1879 (46)
- Smilax glauca Walt. [reported as: Smilax sarsaparilla L.]
- Sabbatie (German) 1900 (158)
- Sabatia angularis (L.) Pursh
- Sabina 1913 (153) NM
- Juniperus monosperma (Engelm.) Sarg. [reported as: Sabina monosperma (Engelm.) Rydb.]
- Sabish 1923 (156)
- Knautia arvensis (L.) Duby [reported as: Scabiosa arvense L.]
- Sabot de Venus Jaune (French) 1828 (7)
- Cypripedium parviflorum Salisb. [reported as: Cypripedium luteum]
- Sabšikan (Chippewa) 1932 (105)
- Podophyllum peltatum L.
- Sacahuiste 1937 (122) TX
- Nolina texana S. Wats.
- Sacaton 1896 (151) NM
- Sporobolus airoides (Torr.) Torr.
- Säckelkraut (German) 1900 (158)
- Capsella bursa-pastoris (L.) Medik. [reported as: Bursa bursa-pastoris (L.) Britton]
- Sacred bean
- 1849-1930 (13, 82, 156)
- Nelumbo Adans. [also reported as: Nelumbium Juss., Nelumbo (Tourn.) Adans]
- 1828-1876 (7, 19, 92)
- Nelumbo lutea Willd. [also reported as: Nelumbium luteum Juss. (Possibly, Nelumbo lutea)]
- Sacred thorn-apple Present (50)
- Datura wrightii Regel
- Saff 1900 (158)
- Salix L.
- Safflower
- 1900-1986 (1, 4, 158)
- Carthamus L.
- 1869-Present (3, 4, 19, 49, 50, 53, 57, 58, 92, 107, 109, 138, 155, 158)
- Carthamus tinctorius L. [also reported as: Carthamnus tinctorius L.]
- Saffron thistle 1876 (92)
- Carthamus tinctorius L.
- Sage
- 1936-1986 (4, 93, 148)
- Artemisia L. [also reported as: Artemisia (Tourn.) L.]
- 1854 (164)
- Artemisia filifolia Torr.
- 1894 (75) MN
- Artemisia ludoviciana Nutt.
- 1850 (28)
- Artemisia tridentata Nutt.
- 1930 (106)
- Croton capitatus Michx.
- 1818-Present (1, 2, 4, 7, 10, 50, 82, 93, 106, 109, 138, 155, 156, 158)
- Salvia L. [also reported as: Salvia (Tourn.) L.]
- 1986 (4)
- Salvia nemorosa L.
- 1932 (85) SD
- Salvia reflexa Hornem.[reported as: Salvia lanceolata Willd.]
- Sage grass [Sage-grass]
- 1912 (152) NM
- Schizachyrium Nees
- 1912 (152) NM
- Schizachyrium scoparium (Michx.) Nash
- Sage willow [Sage-willow]
- 1913-1942 (5, 85, 93, 155)
- Salix candida Flueggé ex Willd.
- 1913-1923 (5, 156)
- Salix humilis Marsh. var. tristis (Aiton) Griggs [also reported as: Salix trista Aiton]
- Sagebrush [Sage brush, Sage-brush] or Sagebush [Sage bush]
- 1878-Present (50, 1, 108, 155, 158) Western US
- Artemisia L.
- 1937 (112) Neb
- Artemisia abrotanum L.
- 1830-1939 (36, 101, 146)
- Artemisia cana Pursh [reported as: Artemisia columbiensis ]
- 1932-1937 (85, 124)
- Artemisia dracunculus L. [also reported as: Artemisia dracunculoides Pursh, Artemisia glauca Pallas]
- 1891 (96) OK
- Artemisia filifolia Torr.
- 1905 (101) MT
- Artemisia frigida Willd.
- 1932 (85) SD
- Artemisia ludoviciana Nutt.
- 1890-1949 (5, 57, 75, 93, 101, 109, 113, 130, 138, 156, 157, 158)
- Artemisia tridentata Nutt.
- 1913 (5)
- Atriplex canescens (Pursh) Nutt. [reported as: Atriplex canescens (Pursh) James]
- Sagebrush buttercup 1942-Present (50, 155)
- Ranunculus glaberrimus Hook.
- Sagebrush stemless acaulis 1942 (155)
- Tetraneuris acaulis (Pursh) Greene var. acaulis [reported as: Actinea acaulis simplex, Tetraneuris simplex A. Nelson]
- Sagebrush violet Present (50)
- Viola vallicola A. Nels.
- Sage-leaf mullein [Sage leaf mullein, Sage-leaf mullen] 1898-1923 (5, 92, 156)
- Phlomis tuberosa L.
- Sage-leaf willow [Sageleaf willow] Present (50)
- Salix candida Flueggé ex Willd.
- Sage-of-Bethlehem 1900-1923 (5, 156, 158)
- Mentha spicata L.
- Sageplant [Sage plant] 1882 (14)
- Artemisia tridentata Nutt.
- Sage-willow [Sage willow] 1898-1923 (92, 156, 158)
- Lythrum salicaria L.
- Sagewood [Sage wood, Sage-wood] 1900-1929 (5, 156, 157)
- Artemisia tridentata Nutt.
- Sagewort wormwood 1942 (155)
- Artemisia campestris L.
- Sago lily 1932-1936 (1, 93) Neb, Native Americans called roots "sego"
- Calochortus Pursh.
- Sago pondweed [Sago pond-weed] 1923-Present (3, 50, 85, 156)
- Stuckenia pectinatus (L.) Boerner [also reported as: Potamogeton pectinatus L.]
- Sahe 1535 (46, 107) St Lawrence River, Cartier
- Phaseolus vulgaris L.
- Sa-hi (Omaha-Ponca) 1830 (37)
- Schoenoplectus tabernaemontani (K.C. Gmel.) Palla [reported as: Scirpus validus Vahl]
- Šahijela tatingpsing la (Lakota, Cheyenne turnip) 1918?-1970? (121)
- Lomatium orientale Coult & Rose
- Sahpakskiisu (Pawnee, skull nut) 1919 (37)
- Carya ovata (P. Mill.) K. Koch [reported as: Hicoria ovata (P. Mill.) Britton]
- Sahtaku (Pawnee) 1919 (37)
- Juglans nigra L.
- Sahu 1535 (107) St Lawrence River, Cartier
- Phaseolus vulgaris L.
- Sahuca bean 1900 (158)
- Glycine max (L.) Merr. [reported as: Glycine hispida Maxim.]
- Sahuco (Spanish) 1900 (158)
- Sambucus nigra L.
- Sailor's-knot [Sailor's knot]
- 1913-1923? (5, 156) obsolete by 1923
- Geranium maculatum L.
- 1900-1929 (157, 158)
- Geranium robertianum L.
- Sainfoin
- 1913 (5)
- Desmodium canadense (L.) DC. [reported as: Meibomia canadense (L.) Kuntze]
- 1913-1923 (5, 156)
- Medicago lupulina L.
- 1913-1923 (5, 110, 156) misapplied
- Medicago sativa L.
- 1879-Present (45, 46, 50, 155)
- Onobrychis P. Mill. [also reported as: Onobrychis Tourn.]
- 1886-Present (45, 50, 68, 92, 107, 109, 110, 129)
- Onobrychis viciifolia Scop. [also reported as: Hedysarum onobrychis L., Onobrychis viciaefolia Scop.]
- Sain-in (China) 1886 (110)
- Dioscorea oppositifolia L. [reported as: Dioscorea batatas Dcne.]
- Saint Jacob's ladder 1930 (82) IA
- Polemonium reptans L.
- Saint Lucia wood 1876 (92)
- Prunus mahaleb L.
- Saintfoin 1949 (109)
- Onobrychis viciifolia Scop. [reported as: Onobrychis viciaefolia Scop.]
- Saka thide (Omaha-Ponca, eaten raw) 1919 (37) Introduced from Africa by Spanish very early and spread quickly or Glimore feels they may be indigenous as Lewis & Clark and others report that they were grown by natives
- Citrullus lanatus (Thunb.) Matsumura & Nakai [reported as: Citrullus citrullus (L.) Karst.]
- Saka yutapi (Dakota Santee) 1919 (37)
- Citrullus lanatus (Thunb.) Matsumura & Nakai [reported as: Citrullus citrullus (L.) Karst.]
- Sakandaka (India) 1886 (110)
- Allium cepa L.
- Salad 1876 (92)
- Lactuca sativa L.
- Salad burnet 1900-1923 (5, 156, 158)
- Sanguisorba minor Scop. ssp. muricata (Spach) Nordborg [also reported as: Poterium sanguisorba L., Sanguisorba sanguisorba (L.) Britton]
- Salad tree [Salad-tree, Sallad tree]
- 1930 (106)
- Cercis L.
- 1770-1923? (5, 41, 156, 157, 158) obsolete by 1923
- Cercis canadensis L.
- Salad violet 1942 (155)
- Viola palmata L. [reported as: Viola esculenta Ell.]
- Saladine 1900 (158)
- Chelidonium majus L.
- Salem grass 1896-1913 (5, 45)
- Holcus lanatus L. [also reported as: Nothoholcus lanatus (L.) Nash]
- Salfern 1900-1929 (157, 158) verbal corruption of saffron
- Buglossoides arvensis (L.) I.M. Johnston [also reported as: Lithospermum arvense L.]
- Salfern stoneseed [Salfern-stone seed] 1913-1923 (5, 156)
- Buglossoides arvensis (L.) I.M. Johnston [also reported as: Lithospermum arvense L.]
- Salf-heal 1932 (1) misapplied
- Prunella vulgaris L.
- Salghe 1900 (158)
- Salix L.
- Salibrosa goldenrod Present (50)
- Solidago canadensis L. var. salebrosa (Piper) M.E.Jones
- Salicaire (French) 1900 (158)
- Lythrum salicaria L.
- Salicis nigrae 1911 (55)
- Salix discolor Muhl.
- Saline plantain 1899-1936 (5, 93, 95, 131)
- Plantago eriopoda Torr.
- Saline saltbush Present (50)
- Atriplex subspicata (Nutt.) Rydb.
- Sallow 1900 (158)
- Salix L.
- Sally 1900 (158)
- Salix L.
- Sally-bloom [Sally bloom]
- 1900-1929 (5, 157, 158)
- Chamerion angustifolium (L.) Holub
- 1894-1923 (76, 156) York Co. NB
- Chamerion angustifolium (L.) Holub ssp. angustifolium [also reported as: Epilobium angustifolium L.]
- Salmonberry [Salmon berry, Salmon-berry]
- 1932 (1)
- Rubus L. [reported as: Rubacer Rydb.]
- 1895-1932 (5, 82, 85, 106, 130, 131, 158)
- Rubus parviflorus Nutt. [also reported as: Rubacer parviflorum (Nutt.) Rydb.]
- Salomon's seal (sic) 1671 (46) Josselyn
- Maianthemum racemosum (L.) Link ssp. racemosum [reported as: Smilacina racemosa (L.) Desf.]
- Saloop 1876-1923 (5, 92, 156, 158)
- Sassafras albidum (Nutt.) Nees [also reported as: Sassafras officinalis, Sassafras sassafras (L.) Kaarst., Sassafras variifolium (Salisb.) Kuntze]
- Salsepareille (French) 1785 (8)
- Smilax L.
- Salsepareille à feuilles ciliées (French) 1785 (8)
- Smilax bona-nox L.
- Salsepareille à feuilles de tamnus (French) 1785 (8)
- Smilax tamnoides L.
- Salsepareille de Virginie (French) 1785 (8)
- Smilax glauca Walt. [reported as: Smilax sarsaparilla L.]
- Salsify [Salsafy]
- 1900-1986 (1, 4, 155, 158)
- Tragopogon L.
- 1886-Present (3, 4, 5, 19, 50, 92, 95, 97, 107, 109, 110, 156, 158)
- Tragopogon porrifolius L. [also reported as: Tragopogon porrifolium L.]
- 1939 (146) MT
- Tragopogon pratensis L.
- Salt cedar 1977-1986 (3, 4)
- Tamarix parviflora DC.
- Salt grass [Saltgrass, Salt-grass]
- 1932-Present (1, 50, 93)
- Distichlis Raf.
- 1852-1970 (5, 11, 75, 85, 87, 90, 111, 116, 119, 121, 129, 134, 144, 146, 151, 163)
- Distichlis spicata (L.) Greene [also reported as: Distichlis maritima Raf., Distichlis spicata (L.) Greene ssp. stricta (Torr.) Thorne, Distichlis stricta (Torr.) Rydb.]
- 1913-1938 (5, 119)
- Leptochloa panicea (Retz.) Ohwi ssp. brachiata (Steudl.) N. Snow [also reported as: Leptochloa filiformis (Lam.) Beauv.]
- 1885-1938 (5, 87, 119, 151)
- Sporobolus airoides (Torr.) Torr.
- Salt heliotrope
- 1942-Present (50, 155)
- Heliotropium curassavicum L.
- 1942-Present (50, 155)
- Heliotropium curassavicum L. var. curassavicum
- Salt lyme grass [Salt lyme-grass] 1901 (94)
- Leymus simplex (Scribn. & Williams) D.R. Dewey [reported as: Elymus simplex Scribn. & Williams]
- Salt meadow diplachne 1907 (5, 72)
- Leptochloa fusca (L.) Kunth ssp. fascicularis (Lam.) N. Snow [also reported as: Diplachne fascicularis (Lam.) Beauv.]
- Salt meadow grass [Salt meadow-grass] 1852 (163)
- Leptochloa fusca (L.) Kunth ssp. fascicularis (Lam.) N. Snow [reported as: Leptochloa fascicularis (Lam.) Gray]
- Salt sand spurry [Salt sandspurry] Present (50)
- Spergularia salina J.& K. Presl
- Salt-and-pepper plant [Salt-and-pepper-plant] 1913-1923 (5, 156)
- Plantago patagonica Jacq. [also reported as: Plantago purshii Roemer & J.A. Schultes]
- Saltbush [Salt bush, Salt-bush]
- 1899-Present (4, 50, 93, 109, 141, 146, 148, 138, 153, 155, 158)
- Atriplex L.
- 1932 (1)
- Atriplex argentea Nutt.
- Salt-cedar [Salt cedar, Saltcedar]
- 1937-1986 (4, 122)
- Tamarix L.
- 1977-Present (3, 4, 50)
- Tamarix ramosissima Ledeb.
- Salt-flat heliotrope [Salt flat heliotrope] 1937 (124) TX
- Heliotropium convolvulaceum (Nutt.) Gray
- Salt-grape [Salt grape, Saltgrape] 1900-1923 (5, 156, 158)
- Salsola kali L.
- Salt-lover [Saltlover] Present (50)
- Halogeton glomeratus (Bieb.) C.A. Mey.
- Salt-marsh aster [Saltmarsh aster] 1986 (4)
- Symphyotrichum divaricatum (Nutt.) Nesom [reported as: Aster subulatus Michx. var. ligulatus Shinners]
- Salt-marsh fleabane [Salt marsh fleabane] 1913-1937 (5, 122, 134, 156)
- Pluchea camphorata (L.) DC.
- Salt-marsh sand spurry [Salt marsh sand spurrey, Saltmarsh sandspurry] 1913-1986 (4, 5, 155, 156)
- Spergularia salina J.& K. Presl [also reported as: Spergularia marina (L.) Griseb., Tissa marina (L.) Britton]
- Salt-meadow cord grass [Saltmeadow cordgrass] 1937 (122) TX
- Spartina pectinata Bosc ex Link [reported as: Spartina patens (Ait.) Muhl. var. juncea (Michx.) A.S. Hitchc.]
- Salt-meadow rush [Saltmeadow rush] 1942-Present (50, 155)
- Juncus gerardi Lois.
- Salt-sage [Salt sage, Saltsage]
- 1899 (141) WY
- Atriplex L.
- 1977 (3)
- Atriplex nuttallii S. Wats.
- 1932-1936 (1, 93) Neb
- Iva L.
- Salt-spring checkerbloom [Salt spring checkerbloom]
- Present (50)
- Sidalcea neomexicana Gray
- Present (50)
- Sidalcea neomexicana Gray ssp. neomexicana
- Saltweed [Saltweed, Salt-weed]
- 1897-1937 (5, 97, 145, 156)
- Atriplex argentea Nutt. [also reported as: Atriplex argenteum Nutt.]
- 1913-1923 (5, 156)
- Juncus bufonius L.
- Saltwort
- 1900 (158)
- Salicornia L.
- 1977-1986 (3, 4)
- Salicornia rubra A. Nels.
- 1818-1936 (1, 2, 10, 93, 158)
- Salsola L.
- 1840-1907 (5, 19, 72, 158)
- Salsola kali L.
- Salve bark (1787) 1911 (59)
- Ulmus rubra Muhl. [reported as: Ulmus fulva Michx]
- Salvia
- 1900 (158)
- Salvia L.
- 1930 (82) IA
- Salvia pratensis L.
- Sambucus 1917 (57)
- Sambucus nigra L. ssp. canadensis (L.) R. Bolli [reported as: Sambucus canadensis L.]
- Samita 1870 (103) NM
- Ribes L.
- Samolus 1977 (3)
- Samolus valerandi L. ssp. parviflorus (Raf.) Hultén [reported as: Samolus parviflorus Raf.]
- Samolus valenrandi
- Present (50)
- Samolus valerandi L.
- Present (50)
- Samolus valerandi L. ssp. parviflorus (Raf.) Hultén
- Samphire 1828-1936 (1, 2, 7, 93)
- Salicornia L. [also reported as: Salicornia (Tourn.) L.]
- Sampson-root [Sampson root , Sampsonroot]
- 1908-1928 (64, 156)
- Echinacea angustifolia DC. var. angustifolia [also reported as: Brauneria angustifolia (DC.) Heller]
- 1900 (158)
- Echinacea pallida (Nutt.) Nutt.
- 1876 (92)
- Possibly,Gentiana alba Muhl. ex Nutt. [reported as: Gentiana ochroleuca Froel.]
- Sampson's snakeroot [Sampson snakeroot, Sampson snake root]
- 1876-1898 (49, 92)
- Gentiana alba Muhl. ex Nutt. [also reported as: Gentiana ochroleuca Froel. (Possibly, Gentiana alba)]
- 1923 (156)
- Gentiana andrewsii Griseb.
- Present (50)
- Orbexilum pedunculatum (P. Mill.) Rydb.
- 1977-Present (3, 4, 50)
- Orbexilum pedunculatum (P. Mill.) Rydb. var. pedunculatum [also reported as: Psoralea pedunculata (P. Mill.) Vail, Psoralea psoraliodes (Walt.) Cory var. eglandulosa (Ell.) F. L. Freeman]
- Sand adder's-tongue [Sand adder's tongue] 1913 (5)
- Ophioglossum vulgatum L. [reported as: Ophioglossum arenarium E.G. Britton]
- Sand bittercress [Sand bitter cress]
- Present (50)
- Cardamine parviflora L.
- 1913-Present (5, 50)
- Cardamine parviflora L. var. arenicola (Britton) Schultz [also reported as: Cardamine arenicola Britton]
- Sand blue grass [Sand blue-grass] 1901 (94)
- Poa secunda J. Presl [reported as: Poa leckenbyi Scribn.]
- Sand bluestem [Sand blue-stem] 1942-Present (3, 50, 140, 155)
- Andropogon hallii Hack.
- Sand briar [Sand-briar, Sand brier] 1898-1923 (5, 49, 53, 62, 75, 156)
- Solanum carolinense L.
- Sand burr [Sand bur, Sand-bur]
- 1894-1913 (5, 75)
- Ambrosia acanthicarpa Hook. [also reported as: Fransenia hookeriana Nutt., Gaertneria acanthicarpa (Hook.) Britton]
- 1899-1936 (5, 63, 72, 93, 156, 158)
- Solanum rostratum Dunal
- Sand cherry [Sandcherry]
- 1840-Present (1, 2, 5, 19, 50, 74, 82, 106, 107, 109, 113, 130, 135, 138, 155, 156, 158) Common among nurserymen
- Prunus pumila L. [also reported as: Cerasus depressa Pursh]
- 1911-1986 (3, 4, 37, 95, 112)
- Prunus pumila L. var. besseyi (Bailey) Gleason [also reported as: Prunus besseyi Bailey]
- 1852 (47)
- Prunus pumila L. var. pumila [reported as: Cerassus pumila Michx.]
- Sand chickasaw plum 1942 (155)
- Prunus angustifolia Marsh. var. watsonii (Sargent) Waugh
- Sand dropseed [Sand drop-seed] 1923-Present (3, 50, 93, 99, 115, 116, 119, 122, 134, 140, 155)
- Sporobolus cryptandrus (Torr.) Gray
- Sand dune sandmat [Sanddune sandmat] Present (50)
- Chamaesyce carunculata (Waterfall) Shinners
- Sand grape 1893 (2, 3, 4, 5, 15, 50, 74, 82, 97, 107, 138, 155, 156)
- Vitis rupestris Scheele
- Sand grass [Sand-grass, Sand grass]
- 1939 (146) MT
- Achnatherum hymenoides (Roemer & J.A. Schultes) Barkworth [reported as: Oryzopsis hymenoides (R. & S.) Ricker]
- 1899 (144) KS
- Andropogon hallii Hack.
- 1890 (68)
- Calamagrostis canadensis (Michx.) Beauv. var. macouniana (Vasey) Stebbins
- 1932-1936 (1, 93)
- Calamovilfa (Gray) Hack. ex Scribn. & Southworth
- 1894-1944 (56, 75, 116, 140)
- Calamovilfa longifolia (Hook.) Scribn.
- 1895 (2)
- Redfieldia Vasey.
- 1932 (85) SD
- Redfieldia flexuosa (Thurb.) Vasey
- 1932-Present (1, 50, 155)
- Triplasis Beauv.
- 1852-1977 (3, 56, 66, 72, 87, 92, 93, 111, 163)
- Triplasis purpurea (Walt.) Chapman [also reported as: Tricuspis purpurea Gray]
- Sand hedge-nettle [Sand hedge nettle] 1913 (5)
- Stachys pilosa Nutt. var. arenicola (Britton) G. Mulligan & D. Munro [reported as: Stachys arenicola Britton]
- Sand Hills muhly [Sandhills muhly, Sandhill muhly] 1942-Present (50, 140, 155)
- Muhlenbergia pungens Thurb.
- Sand knot grass [Sand knot-grass] 1852 (163)
- Paspalum vaginatum Sw.
- Sand lily [Sand-lily]
- 1949 (109)
- Leucocrinum Nutt. ex Gray
- 1900-1936 (93, 157)
- Leucocrinum montanum Nutt. ex Gray
- Sand-lily [Sand lily]
- 1932-1986 (1, 4)
- Mentzelia L. [also reported as: Nuttallia Raf.]
- 1905 (101) MT
- Mentzelia albicaulis (Dougl. ex Hook.) Dougl. ex Torr. & Gray
- 1977 (3)
- Mentzelia decapetala (Pursh ex Sims) Urban & Gilg ex Gilg
- Sand love grass [Sand lovegrass] 1942-Present (3, 50, 155)
- Eragrostis trichodes (Nutt.) Wood
- Sand milkweed 1913-Present (3, 4, 5, 50, 93, 97, 122)
- Asclepias arenaria Torr.
- Sand muhly
- 1942-Present (3, 50, 155)
- Muhlenbergia arenicola Buckl.
- 1977 (3)
- Muhlenbergia pungens Thurb.
- Sand onion 1937 (97) OK
- Allium canadense L. var. mobilense (Regal) Ownbey [reported as: Allium arenicola Small]
- Sand parsley [Sand-parsley] 1900-Present (1, 4, 50, 158)
- Ammoselinum Torr. & Gray
- Sand paspalum 1942 (155)
- Paspalum setaceum Michx. [reported as: Paspalum rigidifolium Nash]
- Sand plantain 1913-Present (5, 50)
- Plantago psyllium L. [also reported as: Plantago arenaria Waldst. & Kit.]
- Sand plum
- 1890-1937 (97, 113)
- Prunus angustifolia Marsh. [also reported as: Prunus chicasa Michx., Prunus watsonii Sargent (Possibly, Prunus angustifolia)]
- 1923-1949 (109, 137, 138)
- Prunus angustifolia Marsh. var. watsonii (Sargent) Waugh [also reported as: Prunus angustifolia watsonii Waugh]
- Sand puffs [Sandpuffs, Sand-puffs]
- 1932 (1)
- Abronia Juss.
- 1932-Present (1, 4, 50, 85)
- Tripterocalyx Hook. ex Standl.
- 1986 (4)
- Tripterocalyx micranthus (Torr.) Hook
- Sand reed grass [Sand reed-grass] or Sand-reed [Sandreed]
- 1942-Present (50, 155)
- Calamovilfa (Gray) Hack. ex Scribn. & Southworth
- 1932-1958 (115, 116)
- Calamovilfa longifolia (Hook.) Scribn.
- Sand reverchonia Present (50)
- Reverchonia arenaria Gray
- Sand-rice [Sand rice] 1932 (1)
- Oryzopsis Michx.[reported as: Eriocoma Nutt.]
- Sand rocket 1900-1986 (3, 4, 5, 85, 156, 158)
- Diplotaxis muralis (L.) DC.
- Sand-rush [Sand rush] 1806 (35)
- Equisetum hyemale L.
- Sand rush grass [Sand rushgrass, Sand rush-grass] 1901-1944 (56, 94, 134, 140)
- Sporobolus cryptandrus (Torr.) Gray
- Sand sage or Sand sagebrush 1923-Present (3, 4, 50, 65, 156)
- Artemisia filifolia Torr.
- Sand spike-rush [Sand spikerush] Present (50)
- Eleocharis montevidensis Kunth
- Sand spike-sedge [Sand spikesedge] 1944 (139) CO
- Eleocharis montevidensis Kunth [reported as: Eleocharis arenicola Torr.]
- Sandspur 1932 (1)
- Cenchrus L.
- Sand spurry [Sand spurry, Sandspurry, Sand spurrey] 1900-Present (1, 50, 155, 156, 158)
- Spergularia (Pers.) J.& K. Presl [also reported as: Tissa Adans.]
- Sand sunflower 1933 (127) ND
- Helianthus petiolaris Nutt
- Sand-verbena [Sand verbena, Sandverbena]
- 1932-Present (1, 4, 50, 93, 109, 155)
- Abronia Juss.
- 1932-1937 (85, 97, 124)
- Abronia fragrans Nutt. ex Hook.
- Sand violet
- 1913-1932 (5, 85) SD
- Viola adunca Sm. var. adunca [also reported as: Viola subvestita Greene]
- Present (50)
- Viola affinis Le Conte
- 1893-1923 (5, 74, 156, 158) CT
- Viola pedata L.
- 1913-1923 (5, 156) misapplied
- Viola sagittata Aiton
- Sand-bar love grass [Sandbar lovegrass] 1942-Present (3, 50, 155)
- Eragrostis frankii C.A. Mey. ex Steud.
- Sandbar willow [Sand bar willow, Sand-bar willow]
- 1932-1986 (1, 4)
- Salix exigua Nutt.
- 1852-Present (1, 4, 5, 22, 47, 50, 65, 72, 82, 85, 93, 95, 97, 105, 112, 113, 130, 131, 155, 156, 158)
- Salix interior Rowlee [also reported as: Salix exigua Nutt. ssp. interior (Rowlee) Cronq., Salix fluviatilis Nutt., Salix longifolia Muhl.]
- Sand-barren puccoon 1923 (156)
- Lithospermum caroliniense (Walt. ex J.F. Gmel.) MacM. [reported as: Lithospermum gmelinii (Michx.) Hitch. (Lithospermum hirtum Lehm.)]
- Sand-beach grape 1923 (156)
- Vitis rupestris Scheele
- Sandbells [Sand bells] 1937 (97, 122) OK TX
- Nama hispidum Gray [also reported as: Marilaunidium hispidum (Gray) Kuntze, Nama hispida Gray, Nama hispidum Gray var. spathulatum (Torr.) C.L. Hitchc.]
- Sandberg's blue grass [Sandberg bluegrass] Present (50)
- Poa canbyi (Scribn.) Piper
- Sandberg's blue grass [Sandberg bluegrass] 1939-Present (3, 50, 140, 146, 155)
- Poa secunda J. Presl [also reported as: Poa sandbergii Vasey]
- Sandbur [Sand bur, Sand-bur]
- 1852-Present (1, 50, 93, 122, 155, 163)
- Cenchrus L.
- 1852-1938 (85, 119, 163)
- Cenchrus spinifex Cav. [also reported as: Cenchrus pauciflorus Benth.]
- 1923 (156)
- Tribulus terrestris L.
- Sand-daisy 1937 (97) OK
- Aphanostephus ramosissimus DC. [reported as: Aphanostephus humilis (Benth.) Gray]
- Sand-dune cryptantha [Sanddune cryptantha] Present (50)
- Cryptantha fendleri (Gray) Greene
- Sand-dune wallflower [Sanddune wallflower]
- Present (50)
- Erysimum capitatum (Dougl. ex Hook.) Greene
- Present (50)
- Erysimum capitatum (Dougl. ex Hook.) Greene var. capitatum
- Sand-foin
- 1932 (1)
- Onobrychis P. Mill. [reported as: Onanbrychis Scop.]
- 1932 (85) SD
- Onobrychis viciifolia Scop. [reported as: Hedysarum onobrychis L., Onobrychis onobrychis (L.) Rydb.]
- Sand-hill amaranth [Sandhill amaranth] Present (50)
- Amaranthus arenicola I.M. Johnston
- Sand-hill bluestem [Sand-hill blue-stem, Sandhill blue-stem, Sandhill bluestem] 1936 (93) Neb
- Andropogon hallii Hack.
- Sand-hill goosefoot [Sandhill goosefoot] 1977-Present (3, 4, 50)
- Chenopodium cycloides A. Nels.
- Sand-hill love grass [Sandhill lovegrass] 1942 (155)
- Eragrostis trichodes (Nutt.) Wood [reported as: Eragrostis pilifera Scheele]
- Sand-hill plum [Sandhill plum] 1870 (103)
- Prunus pumila L.
- Sand-hill sunflower [Sandhill sunflower] 1897 (145) KS
- Helianthus petiolaris Nutt
- Sand-hill tumbleweed [Sand-hill tumble-weed, Sandhill tumbleweed] 1897 (145) KS
- Cycloloma atriplicifolium (Spreng.) Coult. [reported as: Cycloloma platyphylla Moq.]
- Sandhills pigweed 1986 (4)
- Amaranthus arenicola I.M. Johnston
- Sandmat Present (50)
- Chamaesyce S.F. Gray
- Sandvine [Sand vine, Sand-vine]
- 1900-1986 (4, 158)
- Cynanchum L. [also reported as: Ampelanus Brit.(Possibly, Cynanchum)]
- 1900-1977 (3, 5, 93, 95, 97, 106, 156, 157)
- Cynanchum laeve (Michx.) Pers. [also reported as: Gonolobus laevis Michx.]
- Sandweed [Sand weed, Sand-weed] 1876-1923? (5, 92, 156, 158) obsolete by 1923
- Spergula arvensis L.
- Sandwort [Sand-wort]
- 1814-Present (1, 2, 4, 10, 15, 50, 93, 109, 138, 156, 167)
- Arenaria L.
- 1929 (157)
- Arenaria hookeri Nutt.
- 1932 (85) SD
- Arenaria serpyllifolia L.
- 1932 (1)
- Minuartia L. [reported as: Sabulina Reichenb.]
- 1900-Present (50, 93, 158)
- Moehringia L.
- 1840 (19)
- Moehringia lateriflora (L.) Fenzl[reported as: Arenaria lateriflora L.]
- Sandy-seed clammy-weed [Sandyseed clammyweed] Present (50)
- Polanisia dodecandra (L.) DC. ssp. trachysperma (Torr. & Gray) Iltis
- Sanfoin
- 1900 (158)
- Possibly,Onobrychis P. Mill. [reported as: Onobrychis Gaertn.]
- 1900-1903 (66, 158)
- Onobrychis viciifolia Scop. [also reported as: Hedysarum onobrychis L., Onobrychis viciaefolia Scop.]
- Sang 1886-1923 (5, 64, 75, 102, 156, 157, 158) abbreviation for ginseng
- Panax quinquefolius L. [also reported as: Aralia quinquefolia Gray (Possibly, Panax quinquefolius), Panax quinquefolium L.]
- Sang tree [Sang-tree] 1900-1923 (156, 158)
- Ptelea trifoliata L.
- Sangreeroot [Sangree root, Sangree-root] 1876-1923 (5, 64, 92, 156, 158)
- Aristolochia serpentaria L.
- Sangrel 1898-1923 (64, 92, 156, 158)
- Aristolochia serpentaria L.
- Sangrel snakeweed [Sangrel snake weed] 1913 (5)
- Aristolochia serpentaria L.
- Sanguesa (Spanish) 1900 (158)
- Rubus idaeus L.
- Sanguinaire (French) 1892-1900 (6, 158)
- Sanguinaria canadensis L.
- Sanguinaire du Canada (French) 1828 (7)
- Sanguinaria canadensis L.
- Sanguinaria 1905-1917 (52, 54, 55, 57, 59, 64)
- Sanguinaria canadensis L.
- Sanguinary 1900-1923 (69, 107, 156, 158)
- Achillea millefolium L.
- Sanicle
- 1818-Present (1, 2, 10, 50, 155, 156, 158)
- Sanicula L. [also reported as: Sanicula (Tourn.) L.]
- 1828-1929 (7, 19, 48, 49, 58, 61, 72, 156, 157)
- Sanicula marilandica L. [also reported as: Sanicula marylandica L.]
- Sanicula canadensis amplissimo laciniato folio 1694 (46) Tournefort
- Sanicula canadensis L.
- Santa Maria 1913-1986 (3, 4, 5, 97, 124)
- Parthenium hysterophorus L.
- Santa Maria feverfew 1937-Present (50, 122)
- Parthenium hysterophorus L.
- Sanwa millet 1901 (56) IA
- Echinochloa frumentacea Link [reported as: Panicum frumentaceum Roxb., non Salisb.]
- Saparidu kahts (Pawnee, mushroom medicine) 1919 (37)
- Echinacea angustifolia DC.
- Saponaria 1908-1917 (57, 64)
- Saponaria officinalis L.
- Saponaria (Spanish) 1900 (158)
- Saponaria officinalis L.
- Saponaria levantica 1917 (57)
- Gypsophila paniculata L.
- Saponary 1900-1929 (64, 157, 158)
- Saponaria officinalis L.
- Sappan 1900 (158)
- Caesalpinia L.
- Sara (Inca) 1919 (107) Garcilasso de la Vega
- Zea mays L.
- Saracen's-corn [Saracen's corn] 1876-1923 (5, 92, 156, 158)
- Fagopyrum esculentum Moench [also reported as: Fagopyrum fagopyrum (L.) Karst, Polygonum fagopyrum L.]
- Saracen's-wheat [Saracen's wheat] 1913 (5)
- Fagopyrum esculentum Moench [reported as: Fagopyrum fagopyrum (L.) Karst]
- Sarepta mustard 1900-1929 (157, 158)
- Brassica juncea (L.) Czern.
- Sargent's cottonwood [Sargent cottonwood] 1923 (138)
- Populus deltoides Bartr. ex Marsh. ssp. monilifera (Aiton) Eckenwalder [reported as: Populus sargenti [Dode.]]
- Sarons blomster (Gottland) 1879 (46)
- Dianthus armeria L.
- Sarrasin (French) 1900 (158)
- Fagopyrum esculentum Moench
- Sarsaparilla
- 1932-1986 (1, 4, 93)
- Aralia L. [also reported as: Aralia (Tourn.) L.]
- 1607-1905 (7, 43, 46, 101)
- Aralia nudicaulis L.
- 1923 (156)
- Cocculus carolinus (L.) DC.
- 1820-1896 (38, 76) Parke Co. ID; Sulphur Grove OH
- Menispermum canadense L.
- 1828-1917 (7, 57, 158)
- Smilax L.
- 1785-1913 (5, 8, 46)
- Smilax glauca Walt. [also reported as: Smilax sarsaparilla L.]
- Sartwell's sedge [Sartwell sedge]
- 1893-Present (5, 50, 66, 72, 139, 155)
- Carex sartwellii Dewey [also reported as: Carex sartwelli]
- Present (50)
- Carex sartwellii Dewey var. sartwellii
- Sarvice 1930 (106) some species
- Amelanchier Medik.
- Sarvice berry 1905 (101) MT
- Amelanchier alnifolia (Nutt.) Nutt. ex M. Roemer
- Sasa'bikwan (Chippewa) 1928 (40)
- Apocynum androsaemifolium L.
- Šašabwaksing (Chippewa) 1932 (105)
- Eupatorium perfoliatum L.
- Sasafafarilla 1896 (76) Bath ME
- Aralia nudicaulis L.
- Sasafril 1896 (76) ME
- Aralia nudicaulis L.
- Sasáp-kwanins (Chippewa) 1932 (105)
- Apocynum cannabinum L.
- Sasapril 1896 (76) ME
- Aralia nudicaulis L.
- Sasaunckapamuck (Naraganset) 1879 (46)
- Sassafras albidum (Nutt.) Nees [reported as: Sassafras officinale Nees.]
- Sasfras (Spanish) 1900 (158)
- Sassafras albidum (Nutt.) Nees [reported as: Sassafras sassafras (L.) Kaarst.]
- Sasgob-minš (Chippewa) 1932 (105)
- Salix interior Rowlee [reported as: Salix longifolia Muhl.]
- Saskatchewan cinquefoil 1942 (155)
- Potentilla hippiana Lehm. [reported as: Potentilla effusa Dougl.]
- Saskatoon
- 1919-1930 (37, 106, 138)
- Amelanchier alnifolia (Nutt.) Nutt. ex M. Roemer
- 1923 (156)
- Amelanchier stolonifera Wieg. [reported as: Amelanchier spicata (Lam.) C. Koch.]
- Saskatoon serviceberry [Saskatoon service-berry]
- 1942-Present (4, 50, 155)
- Amelanchier alnifolia (Nutt.) Nutt. ex M. Roemer
- Present (50)
- Amelanchier alnifolia (Nutt.) Nutt. ex M. Roemer var. alnifolia
- Sassafariller 1894 (75) Banner Elk NC
- Aralia nudicaulis L.
- Sassafrack 1923 (156)
- Sassafras albidum (Nutt.) Nees [reported as: Sassafras variifolium (Salisb.) Kuntze]
- Sassafras or Sassafras tree
- 1900-Present (1, 4, 50, 138, 155, 158)
- Sassafras Nees. & Eberm. [also reported as: Sassafras Trew]
- 1770-Present (2, 5, 8, 18, 19, 20, 38, 41, 46, 48, 50, 53, 57, 58, 61, 72, 92, 97, 105, 106, 107, 109, 124, 156, 158)
- Sassafras albidum (Nutt.) Nees [also reported as: Laurus sassafras L., Sassafras officinalis, Sassafras sassafras (L.) Kaarst., Sassafras variifolium (Salisb.) Kuntze]
- Sassafras (French) 1900 (158)
- Sassafras albidum (Nutt.) Nees [reported as: Sassafras sassafras (L.) Kaarst.]
- Sassafras bark 1876 (92)
- Sassafras albidum (Nutt.) Nees [reported as: Sassafras officinalis]
- Sassafras root 1876 (92)
- Sassafras albidum (Nutt.) Nees [reported as: Sassafras officinalis]
- Sassafras wood 1876 (92)
- Sassafras albidum (Nutt.) Nees [reported as: Sassafras officinalis]
- Sassaparil 1828 (7)
- Aralia nudicaulis L.
- Sasskraut (German) 1919 (107)
- Alliaria petiolata (Bieb.) Cavara & Grande
[reported as: Sisymbrium alliaria Scop.]
- Satin grass [Satin-grass]
- 1896 (45)
- Muhlenbergia glomerata (Willd.) Trin.
- 1901-1938 (5, 56, 119)
- Muhlenbergia mexicana (L.) Trin.
- 1852-1938 (5, 56, 119, 163)
- Muhlenbergia racemosa (Michx.) B.S.P.
- 1852-1938 (119, 163)
- Muhlenbergia schreberi J.F. Gmel.
- 1901 (56) IA
- Muhlenbergia tenuiflora (Willd.) B.S.P. [reported as: Muhlenbergia willdenovii Trin.]
- Satin-flower [Satin flower]
- 1898-1923 (92, 156) misapplied
- Stellaria media (L.) Vill.
- 1900-1929 (157, 158)
- Stellaria media (L.) Vill. ssp. media [also reported as: Alsine media L.]
- 1949 (109)
- Sisyrinchium L.
- Satin-lily [Satin lily] 1923 (156)
- Sisyrinchium angustifolium Mill.
- Saturday's-pepper [Saturday's pepper] 1923 (156)
- Euphorbia helioscopia L.
- Satyr orchid 1923 (138)
- Coeloglossum viride (L.) Hartman var. virescens (Muhl. ex Willd.) Luer [reported as: Habenaria bracteata W.]
- Sauce (Spanish) 1900 (158)
- Salix L.
- Sauce-alone [Sauce alone]
- 1900-1923? (5, 107, 156, 158) obsolete by 1923
- Alliaria petiolata (Bieb.) Cavara & Grande [also reported as: Alliaria alliaria (L.) Britton, Alliaria officinalis Andrz., Sisymbrium alliaria ]
- 1876-1900 (92, 158)
- Lepidium sativum L. [also reported as: Lepidium sativa]
- Saudistel (German) 1900 (158)
- Sonchus oleraceus L.
- Sauerkirschen (German) 1886 (110)
- Prunus cerasus L.
- Saugh
- 1900 (158)
- Ligustrum vulgare L.
- 1900 (158)
- Salix L.
- Saule (French) 1785-1900 (8, 158)
- Salix L.
- Saule à feuilles argentees (French) 1857 (20)
- Salix exigua Nutt. [reported as: Salix argophylla]
- Saule jaune (French) 1857 (20)
- Salix lutea Nutt.
- Saule laurier (French) 1857 (20)
- Salix pentandra L.
- Saule nain (French) 1785 (8)
- Salix humilis Marsh.
- Saule noir (French) 1785 (8)
- Salix nigra Marsh.
- Sauohr (German) 1900 (158)
- Plantago major L.
- Saurach (German) 1900 (158)
- Berberis vulgaris L.
- Saurdorn (German) 1892 (6)
- Berberis vulgaris L.
- Saururus Present (50)
- Saururus L.
- Sausafras 1806 (35) William Clark
- Sassafras albidum (Nutt.) Nees
- Sauz (Spanish) 1900 (158)
- Salix L.
- Savin
- 1892 (73) Newfoundland, berries are called face-and-eye berries
- Juniperus horizontalis Moench [reported as: Juniperus sabina var. procumbens]
- 1895-1930 (2, 5, 46, 106, 158) misapplied
- Juniperus virginiana L.
- Savonnière (French) 1929 (157)
- Saponaria officinalis L.
- Savoy cabbage 1919 (107)
- Brassica L.
- Savoyan 1876 (92)
- Galium aparine L.
- Savoyan (Canada) 1828 (7)
- Galium verum L.
- Saw greenbrier 1942-Present (50, 155)
- Smilax bona-nox L.
- Sawatch knotweed 1942 (155)
- Polygonum douglasii Greene ssp. johnstonii (Munz) Hickman [reported as: Polygonum sawatchense Small]
- Saw-beak sedge 1977 (3)
- Carex straminea Willd. ex Schkuhr
- Sawbrier [Saw-brier, Saw brier] 1900-1923 (156, 157)
- Smilax glauca Walt.
- Saw-leaf mugwort [Saw-leaved mugwort] 1899-1913 (5, 72, 131)
- Artemisia ludoviciana Nutt. ssp. ludoviciana [also reported as: Artemisia serrata Nutt.]
- Sawort 1828 (7)
- Liatris Gaertn. ex Schreber. [reported as: Liatris Auct.]
- Saw-sepal penstemon [Sawsepal penstemon]
- 1942-Present (50, 155)
- Penstemon glaber Pursh
- Present (50)
- Penstemon glaber Pursh var. glaber
- Sawtooth sagebrush 1942 (155)
- Artemisia ludoviciana Nutt. ssp. ludoviciana [reported as: Artemisia serrata Nutt.]
- Saw-tooth sunflower [Sawtooth sunflower, Saw toothed sunflower] 1899-Present (3, 4, 5, 50, 72, 80, 93, 97, 122, 131, 138, 155)
- Helianthus grosseserratus Martens
- Sawtooth wormwood 1923 (138)
- Artemisia ludoviciana Nutt. ssp. ludoviciana [reported as: Artemisia serrata Nutt.]
- Saxapril 1896 (76) Bath ME
- Aralia nudicaulis L.
- Saxefras 1879 (46)
- Sassafras albidum (Nutt.) Nees [reported as: Sassafras officinale Nees.]
- Saxifarilla 1879 (46) W. Wood
- Possibly,Smilax glauca Walt.
- Saxifrage
- 1900 (158) misapplied
- Carum carvi L. [reported as: Carum carui L.]
- 1814-Present (1, 10, 50, 109, 138, 155, 156, 158, 167)
- Saxifraga L. [also reported as: Micranthes Haw., Saxifraga (Tourn.) L.]
- 1932-1977 (3, 85)
- Saxifraga cernua L.
L.
- Saxifrax 1876-1900 (92, 158)
- Sassafras albidum (Nutt.) Nees [also reported as: Sassafras officinale Nees., Sassafras sassafras (L.) Kaarst.]
- Say's rose 1895 (130) SD
- Rosa acicularis Lindl.
- Scabby-head [Scabby head] 1913-1923 (5, 156)
- Torilis arvensis (Huds.) Link [also reported as: Torilis anthriscus (L.) Gmel.]
- Scabiosa centaurea 1942 (155)
- Centaurea scabiosa L.
- Scabious 1892-1929 (6, 49, 53, 92, 156, 157, 158)
- Conyza canadensis (L.) Cronq. var. canadensis [also reported as: Erigeron canadensis L., Leptilon canadense (L.) Britton]
- Scabious knapweed 1913-1923 (5, 156)
- Centaurea scabiosa L.
- Scabish
- 1828 (7)
- Erigeron philadelphicus L.
- 1828-1923? (5, 6, 7, 19, 76, 92, 156, 158) South Berwick ME, misapplied, obsolete by 1923
- Oenothera biennis L. [also reported as: Onagra biennis (L.) Scop.]
- Scabius 1617 (46)
- Erigeron annuus (L.) Pers.
- Scabrous centaury 1840 (19)
- Centaurea scabiosa L.
- Scaddie 1900-1929 (157, 158)
- Urtica dioica L.
- Scaldweed [Scald weed, Scald-weed]
- 1913-Present (5, 50, 156)
- Cuscuta gronovii Willd. ex J.A. Schultes
- Present (50)
- Cuscuta gronovii Willd. ex J.A. Schultes var. gronovii
- Scale-flower dodder [Scaleflower dodder] Present (50)
- Cuscuta squamata Engelm.
- Scale-seed [Scaleseed] 1986-Present (4, 50)
- Spermolepis Raf.
- Scallion 1900 (158) misapplied
- Allium porrum L.
- Scaly blazing star [Scaly blazing-star]
- 1876-Present (50, 92, 122, 156)
- Liatris squarrosa (L.) Michx.
- Present (50)
- Liatris squarrosa (L.) Michx.var. compacta Torr. & Gray
- Present (50)
- Liatris squarrosa (L.) Michx. var. glabrata (Rydb.) Gaiser
- Present (50)
- Liatris squarrosa (L.) Michx. var. hirsuta (Rydb.) Gaiser
- Scaly dragon's-claw [Scaly dragons' claw, Scaly dragonclaw]
- 1876 (92)
- Corallorrhiza odontorhiza (Willd.) Poir.
- 1828 (7)
- Pterospora andromedea Nutt.
- Scaly grindelia 1898-1903 (49, 69)
- Grindelia squarrosa (Pursh) Dunal
- Scaly notholaena 1937 (97) OK
- Astrolepis sinuata (Lag. ex Sw.) Benham & Windham ssp. sinuata [reported as: Notholaena sinuata (Sw.) Kaulf]
- Scaly-bark 1923 (156)
- Carya ovata (P. Mill.) K. Koch
- Scammony 1913-1923 (5, 156)
- Ipomoea pandurata (L.) G.F.W. Mey.
- Scammony-root [Scammony root] 1876-1923 (92, 156, 158)
- Ipomoea pandurata (L.) G.F.W. Mey. [also reported as: Convolvulus panduratus]
- Scandix 1919 (107)
- Scandix pecten-veneris L.
- Scapose musineon 1899 (5, 131) SD
- Musineon tenuifolium (Nutt. ex Torr. & Gray) Coult. & Rose
- Scapose primrose
- 1900 (158)
- Oenothera L. [reported as: Pachylophus Spach.]
- 1899-1913 (5, 131) SD
- Oenothera caespitosa Nutt. [also reported as: Pachylopus caespitosa (Nutt.) Raimann]
- Scapose tickclover 1986 (4)
- Desmodium nudiflorum (L.) DC.
- Scardiccione (Italian) 1879 (46)
- Onopordum acanthium L. [reported as: Onopordon acanthium L.]
- Scarlet beeblossom Present (50)
- Gaura coccinea Nutt. ex Pursh
- Scarlet clover 1913 (68) Ottawa
- Trifolium incarnatum L.
- Scarlet coral honeysuckle 1878 (86)
- Lonicera sempervirens L.
- Scarlet elder
- 1923 (156)
- Sambucus racemosa L.
- 1923-1942 (138, 155)
- Sambucus racemosa L. var. racemosa
[also reported as: Sambucus pubens Michx.]
- Scarlet gaura 1899-1986 (3, 4, 5, 72, 85, 93, 97, 121, 131, 155, 156, 157)
- Gaura coccinea Nutt. ex Pursh [also reported as: Gaura coccinea Pursh]
- Scarlet gilia 1923 (156)
- Ipomopsis rubra (L.) Wherry [reported as: Gilia rubra (L.) Heller]
- Scarlet globe-mallow [Scarlet globemallow]
- 1942-Present (50, 155)
- Sphaeralcea coccinea (Nutt.) Rydb.
- Present (50)
- Sphaeralcea coccinea (Nutt.) Rydb. ssp. coccinea
- Scarlet haw 1907-1913 (5, 72) IA
- Crataegus chrysocarpa Ashe or Crataegus pedicellata Sargent [also reported as: Crataegus coccinea L.]
- Scarlet hawthorn 1900 (158)
- Crataegus chrysocarpa Ashe or Crataegus pedicellata Sargent [reported as: Crataegus coccinea L.]
- Scarlet honeysuckle 1923 (156)
- Lonicera sempervirens L.
- Scarlet Indian paintbrush Present (50)
- Castilleja coccinea (L.) Spreng.
- Scarlet lightning
- 1893 (74) Quebec, scarlet variety
- Dianthus barbatus L.
- 1892-1923 (5, 73, 156, 158) Hemmingford N.J., prob. corruption of lychnis
- Lychnis chalcedonica L.
- Scarlet lobelia 1892-1923 (6, 156)
- Lobelia cardinalis L.
- Scarlet lychnis 1840-1986 (4, 5, 19, 156, 158)
- Lychnis chalcedonica L.
- Scarlet mallow 1932 (1)
- Sphaeralcea St. Hill.
- Scarlet malva 1926 (98) Neb
- Possibly,Sphaeralcea coccinea (Nutt.) Rydb. ssp. coccinea [reported as: Malvastrum coccineum (Pursh) Gray]
- Scarlet oak 1929 (157)
- Quercus velutina Lam.
- Scarlet painted-cup [Scarlet paintedcup]
- 1895-1923 (2, 5, 72, 97, 156, 158)
- Castilleja coccinea (L.) Spreng.
- 1942 (155)
- Castilleja miniata Dougl. ex Hook.
- Scarlet pimpernel
- 1849-Present (3, 5, 19, 49, 50, 57, 72, 92, 97, 122, 155, 156, 157, 158)
- Anagallis arvensis L.
- Present (50)
- Anagallis arvensis L. ssp. arvensis
- Scarlet rose-mallow [Scarlet rose mallow] 1977 (3)
- Hibiscus laevis All. [reported as: Hibiscus militaris Cavar.]
- Scarlet star-glory [Scarlet starglory] 1923-1942 (138, 155)
- Ipomoea coccinea L. [also reported as: Quamoclit coccinea (L.) Moench]
- Scarlet strawberry
- 1886-1937 (5, 97, 107, 110, 157, 158)
- Fragaria virginiana Duchesne [also reported as: Fragaria virginiana Ehrh. (Possibly, same species)]
- 1907 (72) IA
- Fragaria virginiana Duchesne ssp. grayana (Vilm. ex J. Gay) Staudt
- Scarlet sumac [Scarlet sumach] 1900-1932 (5, 85, 93, 95, 106, 107, 156, 157, 158)
- Rhus glabra L.
- Scarlet thorn 1900-1931 (5, 82, 135, 137, 158)
- Crataegus chrysocarpa Ashe or Crataegus pedicellata Sargent [also reported as: Crataegus coccinea L.]
- Scarlet trumpet honeysuckle 1878-1913 (5, 86, 158)
- Lonicera sempervirens L.
- Scarlet-berry [Scarlet berry] 1876-1923 (49, 53, 92, 156, 158)
- Solanum dulcamara L.
- Scarlet-cross 1900 (158)
- Lychnis chalcedonica L.
- Scarlet-fruit horse-gentian [Scarlet-fruited horse-gentian]
- 1937 (97) OK
- Triosteum aurantiacum Bickn.
- 1913 (5)
- Triosteum aurantiacum Bickn. var. aurantiacum
- Scarlet-fruit thorn [Scarlet-fruited thorn] 1895-1923 (2, 156)
- Crataegus chrysocarpa Ashe or Crataegus pedicellata Sargent [also reported as: Crataegus coccinea L.]
- Scarlet-pea [Scarlet pea] 1986 (4)
- Indigofera miniata Ort. var. leptosepala (Nutt.) B.L.Turner
- Scentbottle [Scent bottle]
- Present (50)
- Platanthera dilatata (Pursh) Lindl. ex Beck
- Present (50)
- Platanthera dilatata (Pursh) Lindl. ex Beck var. albiflora (Cham.) Ledeb.
- Present (50)
- Platanthera dilatata (Pursh) Lindl. ex Beck var. dilatata
- Scented-fern [Scented fern] 1904 (69)
- Tanacetum vulgare L.
- Scentless camomile [Scentless chamomile] 1913-1936 (5, 93, 156)
- Tripleurospermum perforata (Merat) M. Lainz [also reported as: Matricaria inodora L.]
- Scentless false camomile [Scentless false chamomile, Scentless false-chamomile] 1923-1949 (109, 138)
- Tripleurospermum perforata (Merat) M. Lainz [also reported as: Matricaria inodora L.]
- Scentless false mayweed Present (50)
- Tripleurospermum perforata (Merat) M. Lainz
- Scentless mayweed 1942 (155)
- Tripleurospermum perforata (Merat) M. Lainz [reported as: Matricaria inodora L.]
- Schaaf-stroo (Dutch) 1879 (46)
- Equisetum hyemale L.
- Schachtelhalm (German) 1892 (6)
- Equisetum hyemale L.
- Schaffthew (German) 1879 (46)
- Equisetum hyemale L.
- Schafgarbe (German) 1892-1900 (6, 158)
- Achillea millefolium L.
- Schafgrippe (German) 1900 (158)
- Achillea millefolium L.
- Schafrippe (German) 1892 (6)
- Achillea millefolium L.
- Schafthalm (German) 1900 (158)
- Hippuris vulgaris L.
- Scharf Hahnenfuss (German)
- 1892-1900 (6, 158)
- Ranunculus acris L.
- 1892 (6)
- Ranunculus sceleratus L.
- Scharlachbeere (German) 1900 (158)
- Phytolacca americana L. var. americana [reported as: Phytolacca decandra L.]
- Schedonnardus 1852-1907 (5, 72, 163)
- Schedonnardus paniculatus (Nutt.) Trel.
- Schellkraut (German) 1900 (158)
- Chelidonium majus L.
- Scheptata (Persian) 1800 (110) Pallas
- Prunus persica (L.) Batsch [reported as: Amygdalus persica L.]
- Scheuerkraut (German) 1900 (158)
- Equisetum arvense L.
- Schierling (German) 1892 (6)
- Conium maculatum L.
- Schildblattinger Entenfuss (German) 1892 (6)
- Podophyllum peltatum L.
- Schildkraut (German) 1900 (158)
- Scutellaria L.
- Schinseng (German) 1900 (158)
- Panax quinquefolius L. [reported as: Panax quinquefolium L.]
- Schlangen Osterluzey (German) 1828 (7)
- Aristolochia serpentaria L.
- Schlangenwurzel (German) 1892 (6)
- Aristolochia serpentaria L.
- Schlascha (Flathead) 1905 (101) MT
- Prunus virginiana L. var. demissa (Nutt.) Torr. [reported as: Prunus demissa (Nutt.) Walp.]
- Schlutten (German) 1900 (158) fruit
- Physalis alkekengi L.
- Schminkbohne (German) 1892 (6)
- Phaseolus vulgaris L.
- Schneck's oak [Schneck oak] 1907-Present (5, 50, 72, 97)
- Quercus shumardii Buckl. var. schneckii (Britt.) Sargent [also reported as: Quercus schneckii Britton]
- Schollkraut or Schöllkraut (German) 1892 (6, 158)
- Chelidonium majus L.
- Schonbluhender Hartriegel (German) 1828 (7)
- Cornus florida L.
- Schoum or schumin (Hebrew) 1886 (110)
- Allium sativum L.
- Schrader's brome [Schraders brome] or Schrader's brome grass 1894-1949 (5, 56, 109, 129)
- Bromus catharticus Vahl [also reported as: Bromus unioloides H.B.K.]
- Schrader's bromus 1896 (45)
- Bromus catharticus Vahl [reported as: Bromus unioloides H.B.K.]
- Schrader's grass 1852-1898 (87, 88, 118, 163)
- Bromus catharticus Vahl [also reported as: Bromus unioloides H.B.K.]
- Schreber's water-shield [Schreber watershield] 1942 (155)
- Brasenia schreberi Gmel.
- Schrucha (Russian) 1886 (110)
- Portulaca oleracea L.
- Schwalbenwurzel (German) 1892 (6)
- Asclepias syriaca L. [reported as: Asclepias cornuti Dcne.]
- Schwartznussbaum (German) 1770 (41)
- Juglans nigra L.
- Schwarz Bilsenkraut or Schwarzes Bilsenkraut (German) 1828-1900 (7, 158)
- Hyoscyamus niger L.
- Schwarz Senf (German) 1892 (6)
- Brassica nigra (L.) W.D.J. Koch [reported as: Sinapis nigra L.]
- Schwarzer Andorn (German) 1900 (158)
- Ballota nigra L.
- Schweinitz's flatsedge [Schweinitz flatsedge] 1942-Present (3, 50, 155)
- Cyperus schweinitzii Torr. [also reported as: Cyperus schweintzi]
- Schweintiz's cyperus [Schweinitz cyperus] 1907-1913 (5, 72) IA
- Cyperus schweinitzii Torr.
- Schweintiz's galingale 1903 (66)
- Cyperus schweinitzii Torr.
- Scirpus-like rush 1913 (5)
- Juncus scirpoides Lam.
- Scirpus-like sedge 1913 (5)
- Carex scirpoidea Michx.
- Scoba 1894 (150) NM
- Chloracantha spinosa (Benth.) Nesom [reported as: Aster spinosus Benth.]
- Scoke
- 1895 (2)
- Phytolacca L.
- 1903 (5, 69, 109)
- Phytolacca L.
- 1892-1923 (2, 6, 49, 62, 64, 92, 107, 156, 157, 158)
- Phytolacca americana L. var. americana [also reported as: Phytolacca decandra L.]
- Scoke jalap 1898 (49)
- Phytolacca americana L. var. americana [reported as: Phytolacca decandra L.]
- Scordon (Modern Greek) 1886 (110)
- Allium sativum L.
- Scoria-lily [Scoria lily] 1933 (127) ND
- Mentzelia decapetala (Pursh ex Sims) Urban & Gilg ex Gilg
- Scorodon (Ancient Greek) 1886 (110)
- Allium sativum L.
- Scoroprasum 1768 (165)
- Allium L.
- Scorpion-grass [Scorpion grass]
- 1818-1930 (2, 10, 82, 156)
- Myosotis L. [also reported as: Myosotis (Rupp.) L.]
- 1900 (158)
- Myosotis scorpioides L. [reported as: Myosotis palustris (L.) Hill]
- Scorpion-weed [Scorpion weed, Scorpionweed]
- 1898 (77) Western US
- Myosotis L. [reported as: Myosotis (Rupp.) L.]
- 1840-1876 (19, 92)
- Myosotis scorpioides L. [also reported as: Myosotis palustris (L.) Hill]
- 1932 (1)
- Phacelia Juss.
- 1936-1986 (3, 4, 93)
- Phacelia hastata Dougl. ex Lehm. var. hastata [also reported as: Phacelia leucophylla Torr.]
- Scorzonera Present (50)
- Scorzonera L.
- Scotch barley 1900 (158) varieties of 6-rowed barley
- Hordeum vulgare L. [reported as: Hordeum hexastichon L.]
- Scotch bluebell 1928 (40)
- Campanula rotundifolia L.
- Scotch caps 1913 (5)
- Rubus occidentalis L.
- Scotch cotton-thistle [Scotch cottonthistle] 1942-Present (50, 155)
- Onopordum acanthium L. [also reported as: Onopordon acanthium L.]
- Scotch grass 1900 (158)
- Cynodon dactylon (L.) Pers. [reported as: Capriola dactylon (L.) Kuntze]
- Scotch mercury 1903-1913 (5, 69)
- Digitalis pupurea L.
- Scotch thistle
- 1879 (46, 158) misapplied
- Carduus nutans L.
- 1900 (158) emblem of Scotland
- Cirsium vulgare (Savi) Ten. [reported as: Carduus lanceolatus L.]
- 1932-1986 (1, 4)
- Onopordum L.
- 1879-1986 (3, 4, 5, 46, 109, 156, 158) England
- Onopordum acanthium L. [also reported as: Onopordon acanthium L.]
- Scott's clematis [Scott clematis] 1899-Present (50, 131, 155)
- Clematis hirsutissima Pursh var. scottii (Porter) Erickson [also reported as: Clematis scottii Porter]
- Scott's leather flower 1913 (5)
- Clematis hirsutissima Pursh var. scottii (Porter) Erickson [reported as: Viorna scottii (Porter) Rydb.]
- Scouler's popcorn-flower [Scouler's popcornflower, Scouler popcornflower] 1942-Present (50, 155)
- Plagiobothrys scouleri (Hook. & Arn.) I.M. Johnston
- Scouler's willow [Scouler willow] 1942-Present (50, 155)
- Salix scouleriana Barr.
- Scouring-rush [Scouring rush, Scouringrush]
- 1919-1986 (4, 37, 126, 148)
- Equisetum L.
- 1929 (157)
- Equisetum arvense L.
- 1840-1977 (3, 6, 19, 40, 46, 48, 49, 52, 53, 57, 72, 107, 124, 155, 158)
- Equisetum hyemale L.
- 1937 (122) TX
- Equisetum hyemale L. var. affine (Engelm.) A.A. Eat.
- Scouring-rush horsetail [Scouringrush horsetail]
- Present (50)
- Equisetum hyemale L.
- Present (50)
- Equisetum hyemale L. var. affine (Engelm.) A.A. Eat.
- Scourweed 1923 (156)
- Saponaria officinalis L.
- Scourwort 1900-1929 (64, 157, 158)
- Saponaria officinalis L.
- Scrambled-eggs [Scrambled eggs]
- 1937-Present (50, 124)
- Corydalis aurea Willd.
- 1937 (122) TX
- Corydalis crystallina Engelm. [reported as: Corydalis curvisiliqua Engelm.]
- Scrambling rocket 1900-1929 (156, 157, 158)
- Sisymbrium officinale (L.) Scop [also reported as: Erysimum officinale L.]
- Scratch grass [Scratchgrass] 1938-Present (3, 50, 119, 140, 146)
- Muhlenbergia asperifolia (Nees & Meyen ex Trin.) Parodi
- Scratch-grass [Scratch grass]
- 1913-1923 (5, 156)
- Galium aparine L.
- 1840-1891 (19, 79)
- Polygonum sagittatum L.
- Scratch-weed [Scratch weed] 1876-1923 (5, 92, 156)
- Galium aparine L.
- Screw-auger [Screw auger] 1894-1913 (5, 75, 156) Nova Scotia
- Spiranthes cernua (L.) L.C. Rich. [also reported as: Ibidium cernuum (L.) House.]
- Scribner's feather grass [Scribner's feather-grass] 1901 (94)
- Achnatherum scribneri (Vasey) Barkworth [reported as: Stipa scribneri Vasey]
- Scribner's needlegrass [Scribner needlegrass] 1942-Present (50, 155)
- Achnatherum scribneri (Vasey) Barkworth [also reported as: Stipa scribneri Vasey]
- Scribner's panic grass 1901 (56) IA
- Dichanthelium oligosanthes (J.A. Schultes) Gould var. scribnerianum (Nash) Gould [reported as: Panicum scribnerianum Nash]
- Scribner's panicum [Scribner panicum] 1899-1944 (5, 56, 72, 131, 140, 155)
- Dichanthelium oligosanthes (J.A. Schultes) Gould var. scribnerianum (Nash) Gould [also reported as: Panicum scribnerianum Nash]
- Scribner's reed grass [Scribner reedgrass] 1942 (155)
- Calamagrostis canadensis (Michx.) Beauv. var. canadensis [reported as: Calamagrostis scribneri Beal]
- Scribner's rosette grass Present (50)
- Dichanthelium oligosanthes (J.A. Schultes) Gould var. scribnerianum (Nash) Gould
- Scrofula plant [Scrofula-plant] 1876-1923 (5, 92, 156) used as remedy for scrofula
- Scrophularia marilandica L. [also reported as: Scrophularia marylandica L.]
- Scrub chestnut oak 1900-1937 (1, 5, 72, 93, 95, 97, 158)
- Quercus prinoides Willd.
- Scrub oak
- 1900-1936 (5, 93, 156, 158)
- Quercus macrocarpa Michx.
- 1900-1929 (5, 156, 157, 158)
- Quercus muehlenbergii Engelm. [also reported as: Quercus acuminata (Michx.) Sarg.]
- 1923 (156)
- Quercus prinoides Willd.
- Scrub pine 1818-1857 (10, 20)
- Pinus banksiana Lamb. [also reported as: Pinus rupestris]
- Scrubbing-rush [Scrubbing rush] 1806-1892 (6, 35)
- Equisetum hyemale L.
- Scrub-bush [Scrub bush] 1900-1923? (5, 156, 158) obsolete by 1923
- Symphyotrichum ericoides (L.) Nesom var. ericoides [also reported as: Aster ericoides L..]
- Scrub-grass [Scrub grass]
- 1919 (107)
- Equisetum fluviatile L.
- 1819 (12)
- Equisetum hyemale L.
- Scupernong 1828 (7)
- Vitis vulpina L.
- Scurf-pea [Scurf pea, Scurfpea] 1923-Present (4, 50, 138)
- Psoralidium Rydb. [also reported as: Psoralea L.]
- Scurfy hickory 1913 (5)
- Carya texana Buckl. [reported as: Hicoria villosa (Sargent) Ashe]
- Scurfy-pea [Scurfy pea] 1900-1986 (4, 98, 157)
- Psoralidium tenuiflorum (Pursh) Rydb. [also reported as: Psoralea tenuiflora Pursh]
- S-curve threeawn 1942-Present (50, 155)
- Aristida oligantha Michx. [also reported as: Aristida ramosissima Engelm.]
- Scurvish 1893-1923? (5, 74, 156, 158) Franconia NH, obsolete by 1923
- Oenothera biennis L. [also reported as: Onagra biennis (L.) Scop.]
- Scurvy 1900-1929 (157, 158)
- Oenothera biennis L.
- Scurvy senvie 1913 (5)
- Brassica nigra (L.) W.D.J. Koch
- Scurvy-grass [Scurvy grass]
- 1849-1932 (1, 13)
- Barbarea Aiton f. [also reported as: Barbarea R. Br.]
- 1892 (6)
- Brassica nigra (L.) W.D.J. Koch [reported as: Sinapis nigra L.]
- 1828 (7)
- Sisyrinchium L.
- Scurvy-pea [Scurvy pea] 1913-1937 (5, 122, 156)
- Psoralidium tenuiflorum (Pursh) Rydb. [also reported as: Psoralea floribunda Nutt. ex Torr. & Gray, Psoralea tenuiflora Pursh]
- Scutch grass [Scutch-grass]
- 1876-1913 (5, 45, 66, 90, 92, 158)
- Cynodon dactylon (L.) Pers. [also reported as: Capriola dactylon (L.) Kuntze]
- 1896-1913 (45, 64, 69, 80, 158)
- Elymus repens (L.) Gould [also reported as: Agropyron repens (L.) Beauv.]
- Scutellaire (French)
- 1900 (158)
- Scutellaria L.
- 1892 (6)
- Scutellaria lateriflora L.
- Scutellaria 1905-1917 (54, 55, 57, 59)
- Scutellaria lateriflora L.
- Scythe-leaf willow [Scythe-leaved willow] 1913 (5)
- Salix nigra Marsh.
- Sea blite [Sea-blite]
- 1840 (19)
- Chenopodium rubrum L. [reported as: Blitum maritimum]
- 1895-1932 (1, 2, 158)
- Suaeda Forsk. ex J.F. Gmel. [also reported as: Dondia Adans. (all US species are Suaeda)]
- 1932-1986 (3, 4, 85)
- Suaeda calceoliformis (Hook.) Moq. [also reported as: Suaeda depressa (Pursh) S. Wats.]
- Sea buckthorn 1840 (19)
- Shepherdia canadensis Nutt. [reported as: Hippophae canadensis W.]
- Sea bulrush 1903 (66)
- Schoenoplectus maritimus (L.) Lye
- Sea burdock 1840-1900 (19, 92, 158)
- Xanthium strumarium L.
- Sea club-rush 1894 (129) SD
- Schoenoplectus maritimus (L.) Lye
- Sea cocklebur 1900 (158)
- Xanthium strumarium L. var. canadense (P. Mill.) Torr. & Gray [reported as: Xanthium canadense P. Mill.]
- Sea cucklebur 1900 (158)
- Xanthium strumarium L. var. canadense (P. Mill.) Torr. & Gray [reported as: Xanthium canadense P. Mill.]
- Sea-goosefoot [Sea goosefoot] 1923 (156)
- Suaeda calceoliformis (Hook.) Moq. [reported as: Suaeda americana (Pers.) Fern.]
- Sea-grape [Sea grape] 1876-1913 (5, 92, 158)
- Salsola kali L.
- Sea-grass [Sea grass] 1900-1923 (5, 156, 158)
- Ruppia maritima L.
- Sea holly 1818 (10)
- Eryngium L.
- Sea hollyhock 1900-1923 (5, 156, 158)
- Hibiscus moscheutos L.
- Sea meadow grass 1913 (5)
- Puccinellia distans (Jacq.) Parl.
- Sea milkwort [Seamilkwort]
- 1770-1986 (1, 4, 41, 155, 156, 158)
- Glaux L.
- 1840-Present (3, 4, 5, 19, 50, 92, 155, 156, 158)
- Glaux maritima L.
- Sea pink [Sea-pink] 1828-1923? (5, 7, 92, 156) obsolete by 1923
- Silene vulgaris (Moench) Garcke [also reported as: Cucubalus behen L., Silene latifolia (P. Mill.) Britton & Rendle]
- Sea-poppy 1949 (109)
- Glaucium P. Mill.
- Sea-purslane [Sea purslane]
- 1895-1986 (1, 4, 2, 15, 158)
- Sesuvium L.
- 1986-Present (4, 50)
- Sesuvium verrucosum Raf.
- Sea-sedge [Sea sedge] 1913-1923 (5, 156)
- Acorus calamus L.
- Sea spur grass 1876 (92)
- Puccinellia distans (Jacq.) Parl. [reported as: Glyceria distans]
- Sea teasel-grass 1913 (5)
- Ruppia maritima L.
- Sea-thrift [Sea thrift] 1900-1923 (5, 156, 158)
- Salsola kali L.
- Sea trifoly 1900-1923 (5, 156, 158)
- Glaux maritima L.
- Sea-beach aristida 1852 (163)
- Aristida tuberculosa Nutt.
- Sea-beach orach [Seabeach orach] 1649 (46)
- Atriplex subspicata (Nutt.) Rydb. [reported as: Atriplex hastata L.]
- Sea-beach sedge [Sea beach sedge] 1913 (5)
- Carex silicea Olney
- Sea-beach triple-awn grass [Sea-beach triple-awned grass] 1913 (5)
- Aristida tuberculosa Nutt.
- Sea-bed sandwort [Sea bed sandwort] 1913 (5)
- Spergularia salina J.& K. Presl [reported as: Tissa marina (L.) Britton]
- Seacoast sumpweed 1942 (155)
- Iva annua L. var. annua [reported as: Iva ciliata Willd.]
- Sealroot 1876 (92)
- Polygonatum biflorum (Walt.) Ell. [reported as: Convallaria multiflora L. , Polygonatum multiflorum Kunth]
- Sealwort
- 1876-1923 (5, 92, 156, 157)
- Polygonatum biflorum (Walt.) Ell. [also reported as: Convallaria multiflora L., Polygonatum multiflorum Kunth]
- 1900-1929 (5, 156, 157, 158)
- Polygonatum biflorum (Walt.) Ell. var. commutatum (J.A. & J.H. Schultes) Morong [also reported as: Polygonatum commutatum (R. & S.) Dietr.]
- Seashore paspalum 1942-Present (50, 155)
- Paspalum vaginatum Sw.
- Seashore saltgrass 1942-1977 (3, 155)
- Distichlis spicata (L.) Greene [also reported as: Distichlis spicata (L.) Greene var. stricta (Torr.) Beetle]
- Seaside arrowgrass [Seaside arrow grass, Seaside arrow-grass, Sea-side arrow grass] 1899-Present (5, 50, 66, 72, 93, 131, 156)
- Triglochin maritimum L.
- Seaside bulrush 1919 (107)
- Schoenoplectus maritimus (L.) Lye
- Seaside crowfoot [Sea-side crowfoot] 1895-1937 (2, 5, 63, 72, 85, 97, 131, 156)
- Ranunculus cymbalaria Pursh [also reported as: Halerpestes cymbalaria (Pursh) Greene, Oxygraphis cymbalaria (Pursh) Prantl.]
- Seaside grape [Sea-side grape] 1814 (167)
- Ephedra L.
- Seaside heliotrope [Sea-side heliotrope]
- 1923-1977 (3, 97, 124, 131, 156)
- Heliotropium curassavicum L.
- 1929-Present (50, 157)
- Heliotropium curassavicum L. var. obovatum DC. [also reported as: Heliotropium spathulatum Rydb.]
- Seaside koniga 1913 (5)
- Lobularia maritima (L.) Desv. [reported as: Koniga maritima (L.) R. Br.]
- Seaside millet 1913-1938 (5, 119)
- Paspalum distichum L.
- Seaside portulaca 1930 (106)
- Claytonia L.
- Seaside rush Present (50)
- Juncus ambiguus Guss.
- Seaside sandwort [Sea side sandwort, Sea-side sandwort] 1913-1923 (5, 156)
- Spergularia salina J.& K. Presl [also reported as: Spergularia marina (L.) Griseb., Tissa marina (L.) Britton]
- Seaside threeawn Present (50)
- Aristida tuberculosa Nutt.
- Secale (Latin) 1886 (110)
- Secale cereale L.
- Seckelblume (German) 1900 (158)
- Ceanothus americanus L.
- Secund rush 1913 (5)
- Juncus secundus Beauv. ex Poir.
- Sedge
- 1814-Present (1, 7, 10, 50, 85, 92, 93, 101, 109, 139, 152, 155, 156, 158, 167)
- Carex L. [also reported as: Carex (Rupp.) L.]
- 1932 (85) SD
- Cyperus bipartitus Torr. [reported as: Cyperus rivularis Kunth]
- Sedge-cane [Sedge cane] 1913-1923 (5, 156)
- Acorus calamus L.
- Sedge grass 1828 (7)
- Andropogon L. [reported as: Andropogon(Royen) L.]
- Sedge-grass [Sedge grass] 1913-1923 (5, 156, 157)
- Acorus calamus L.
- Sedge root 1913 (5)
- Acorus calamus L.
- Sedge-rush [Sedge rush] 1913-1923 (5, 156)
- Acorus calamus L.
- Sedge-like equisetum 1913 (5)
- Equisetum scirpoides Michx.
- Sedge-like horsetail [Sedgelike horsetail] 1942 (155)
- Equisetum scirpoides Michx.
- Seed mesquite 1901 (94)
- Bouteloua rigidiseta (Steud.) Hitchc. [reported as: Bouteloua texana S. Wats.]
- Seed ticks 1912 (62) IN
- Desmodium canadense (L.) DC. [reported as: Meibomia canescens L.]
- Seedbox [Seed box, Seed-box]
- 1923-1986 (4, 122, 138, 155)
- Ludwigia L.
- 1840-Present (2, 5, 19, 50, 63, 72, 74, 92, 156, 158)
- Ludwigia alternifolia L. [also reported as: Ludwigea alternifolia L.]
- Seeded-plum [Seeded plums] 1828-1923 (7, 19, 92, 156, 158)
- Diospyros virginiana L.
- Seeder 1900-1929 (157, 158)
- Humulus lupulus L.
- Seel 1900 (158)
- Salix L.
- Seep arnica Present (50)
- Arnica lonchophylla Greene ssp. arnoglossa (Greene) Maguire
- Seep monkey-flower [Seep monkeyflower] Present (50)
- Mimulus guttatus DC.
- Seepweed
- 1942-Present (4, 50, 155)
- Suaeda Forsk. ex J.F. Gmel. [also reported as: Suaeda Forsch. ex Scop]
- 1986 (4)
- Suaeda moquinii (Torr.) Greene
- Seepwillow baccharis 1942 (155)
- Baccharis salicifolia (Ruiz & Pavón) Pers.
[reported as: Baccharis glutinosa (Ruiz and Pavon) Pers.]
- Segal (Breton) 1886 (110)
- Secale cereale L.
- Segede bwens (Chippewa) 1932 (105)
- Osmorhiza longistylis (Torr.) DC.
- Sego lily [Segolily]
- 1905 (101) MT
- Calochortus Pursh.
- 1977-Present (3, 50)
- Calochortus gunnisonii S. Wats.
- 1942-Present (50, 155)
- Calochortus nuttallii Torr. & Gray
- 1903 (133) ND
- Zigadenus venenosus S. Wats. var. gramineus (Rydb.) Walsh ex M.E. Peck [reported as: Zygadenus venenosus]
- Seidenpflanzen (German) 1892-1900 (6, 158)
- Asclepias syriaca L. [also reported as: Asclepias cornuti Dcne.]
- Seifenwurzel (German) 1900 (158)
- Saponaria officinalis L.
- Seigle (French) 1900 (158)
- Secale cereale L.
- Selaginella
- 1900-1942 (1, 138, 155, 158) Diminutive of Selago an ancient name of a lycopodium
- Selaginella Beauv.
- 1939 (146) MT
- Selaginella densa Rydb.
- Selenia 1913-1937 (5, 97) OK
- Selenia aurea Nutt.
- Self-heal [Self heal, Selfheal]
- 1900-Present (2, 50, 138, 155, 158)
- Prunella L. [also reported as: Brunella]
- 1818-1986 (3, 4, 5, 10, 40, 48, 63, 80, 82, 97, 106 109, 124, 131, 156, 157, 158)
- Prunella vulgaris L. [also reported as: Brunella vulgaris L.]
- Selinocarpus 1900 (158)
- Selinocarpus Gray
- Selinon 322 BC (107) Theophrastus
- Petroselinum crispum (P. Mill.) Nyman ex A.W. Hill [reported as: Carum petroselinum Benth. & Hook. f.]
- Selkirk's violet [Selkirk violet] 1895-Present (2, 5, 50, 138)
- Viola selkirkii Pursh ex Goldie
- Selly 1900 (158)
- Salix L.
- Sencion 1900-1923 (156, 158)
- Senecio vulgaris L.
- Seneca grass 1840-1903 (5, 19, 45, 66, 87, 90, 92)
- Hierochloe odorata (L.) Beauv. [also reported as: Hierochloa borealis Sch. (Anthoxanthum nitens (Weber) Y. Schouten & Veldkamp), Savastana odorata (L.) Scribn.]
- Seneca root [Senega-root, Senega root, Seneka root] 1876-1922, 1923 (5, 53, 55, 92, 156, 158)
- Polygala senega L.
- Seneca snakeroot [Seneca snake root, Seneca-snakeroot, Senega snakeroot [Senega snake root, Seneka snakeroot [Seneka snake root]]] 1892-Present (3, 4, 5, 6, 7, 15, 19, 35, 40, 47, 48, 49, 50, 52, 53, 57, 63, 64, 72, 85, 92, 93, 138, 156, 158)
- Polygala senega L.
- Seneca-snakeroot polygala 1942 (155)
- Polygala senega L.
- Senecon (Spanish) 1900 (158)
- Senecio vulgaris L.
- Senega 1870-1922 (46, 52, 53, 59, 61, 64)
- Polygala senega L.
- Senega Wurzel or Senegawurzel (German) 1892-1900 (6, 158)
- Polygala senega L.
- Seng 1907 (64)
- Panax quinquefolius L. [reported as: Panax quinquefolium L.]
- Senhalanac [Senhalenac] 1893-1923 (5, 74, 156, 158) Ferrisburgh VA, name of Saranac River comes from this
- Rhus glabra L.
- Senna
- Present (50)
- Senna P. Mill.
- 1930 (106) Southern states
- Senna marilandica (L.) Link [reported as: Cassia marilandica L.]
- Senna Americana (Off. Name) 1828 (7)
- Senna marilandica (L.) Link [reported as: Cassia marilandica L.]
- Senne' d'Amerique (French) 1913 (5)
- Senna marilandica (L.) Link [reported as: Cassia marilandica L.]
- Senore 1900 (158)
- Brassica nigra (L.) W.D.J. Koch
- Senors 1929 (157)
- Brassica nigra (L.) W.D.J. Koch
- Sensitive brier [Sensitivebrier, Sensitive briar]
- 1895-1986 (1, 2, 4, 155, 158)
- Mimosa L. [also reported as: Leptoglottis DC., Morongia Brit., Schranckia Willd, Schrankia Willd. (all US species are in Mimosa)]
- 1986 (4)
- Mimosa nuttallii (DC.) B.L. Turner [reported as: Schrankia nuttallii (DC.) Standl.]
- 1977 (3)
- Mimosa rupertiana B.L. Turner [reported as: Schrankia occidentalis (W. & S.) Standl.]
- 1942 (155)
- Neptunia Lour.
- Sensitive cassia 1820 (38)
- Chamaecrista nictitans (L.) Moench ssp. nictitans var. nictitans [reported as: Cassia nictitans L.]
- Sensitive fern [Sensitive-fern, Sensitivefern]
- 1818-Present (1, 4, 10, 50, 72, 138, 158)
- Onoclea L.
- 1840-1986 (3, 4, 5, 19, 50, 86, 92, 97, 109, 122, 131, 155, 157, 158) fronds wilt quickly when cut and are very sensitive to frost
- Onoclea sensibilis L.
- Sensitive partridge-pea [Sensitive partridge pea] 1986 (4)
- Chamaecrista fasciculata (Michx.) Greene var. fasciculata [reported as: Cassia nictitans L.]
- Sensitive pea [Sensitive-pea]
- 1932-Present (1, 50, 93) Neb
- Chamaecrista (L.) Moench
- 1930-1932 (85, 125)
- Chamaecrista fasciculata (Michx.) Greene
- 1852-1930 (47, 92, 106, 131)
- Chamaecrista fasciculata (Michx.) Greene var. fasciculata [also reported as: Cassia chamaecrista L.]
- 1913-1937 (5, 97)
- Chamaecrista nictitans (L.) Moench
- 1900-1977 (3, 156, 158)
- Chamaecrista nictitans (L.) Moench ssp. nictitans var. nictitans [also reported as: Cassia nictitans L.]
- Sensitive plant
- 1923 (156)
- Chamaecrista fasciculata (Michx.) Greene var. fasciculata [reported as: Cassia chamaecrista L.]
- 1898-1923 (92, 156)
- Chamaecrista fasciculata (Michx.) Greene var. fasciculata [also reported as: Cassia nictitans L.]
- Present (50)
- Mimosa L.
- Sensitive senna 1876 (92)
- Chamaecrista fasciculata (Michx.) Greene var. fasciculata [reported as: Cassia chamaecrista L.]
- Senvie 1913 (5)
- Sinapis alba L.
- Senvre 1900 (158)
- Sinapis alba L.
- Sepentaire de Virginie (French) 1828-1900 (7, 158)
- Aristolochia serpentaria L.
- Septentaria Virginiana 1828 (7) Oficial name of Materia medica
- Aristolochia serpentaria L.
- Sericea lespedeza 1977-1986 (3, 4)
- Lespedeza cuneata (Dumort.-Cours.) G. Don
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