Click on a common name for a photo of the plant, or click on a letter for names beginning with that letter.
| Sage, Lyre-leaf |
Salvia lyrata |
| Sandbur, Dune |
Cenchrus tribuloides |
| Sandspurry, Salt Marsh |
Spergularia salina |
| Sandwort, Pine Barren |
Minuartia caroliniana |
| Sandwort, Rock |
Minuartia michauxii var. michauxii |
| Sarsaparilla, Wild |
Aralia nudicaulis |
| Sassafras |
Sassafras albidum |
| Saxifrage, Virginia |
Micranthes virginiensis |
| Screw-stem |
Bartonia paniculata subsp. paniculata |
| Screwstem, Yellow |
Bartonia virginica |
| Sea-lavender |
Limonium carolinianum |
| Sea-rocket, American |
Cakile edentula |
| Seal, Golden |
Hydrastis canadensis |
| Sedge, Asymmetrical Fringed |
Carex crinita var. crinita |
| Sedge, Bellow-beaked |
Carex albicans |
| Sedge, Bladder |
Carex intumescens |
| Sedge, Lax-culmed |
Carex laxiculmis var. laxiculmis |
| Sedge, Loose-flowered |
Carex laxiflora |
| Sedge, Oval-leaved |
Carex cephalophora |
| Sedge, Slender Wood |
Carex digitalis var. digitalis |
| Seedbox, Bushy |
Ludwigia alternifolia |
| Seedbox, Creeping Water Primrose |
Ludwigia peploides subsp. glabrescens |
| Seedbox, Globe-fruited |
Ludwigia sphaerocarpa |
| Seepweed, Herbaceous |
Suaeda maritima |
| Self-heal, Native |
Prunella vulgaris var. lanceolata |
| Senna, Wild |
Senna hebecarpa |
| Shadbush |
Amelanchier canadensis var. canadensis |
| Shadbush, Downy |
Amelanchier arborea |
| Shepherd's-cress |
Teesdalia nudicaulis |
| Shinleaf, Elliptic |
Pyrola elliptica |
| Skeletonweed |
Chondrilla juncea |
| Skullcap, Hairy |
Scutellaria elliptica var. elliptica |
| Skullcap, Hyssop |
Scutellaria integrifolia |
| Skullcap, Mad-dog |
Scutellaria lateriflora |
| Smartweed, Dock-leaf |
Persicaria lapathifolia |
| Smartweed, Dotted |
Persicaria punctata |
| Smartweed, Lady's Thumb |
Persicaria maculosa |
| Smartweed, Longbristle |
Persicaria longiseta |
| Smartweed, Marshpepper |
Persicaria hydropiper |
| Smartweed, Pennsylvania |
Persicaria pensylvanica |
| Smartweed, Prince's-plume |
Persicaria orientalis |
| Smartweed, Virginia |
Persicaria virginiana |
| Snakeroot, Clustered Black |
Sanicula odorata |
| Snakeroot, Lesser |
Ageratina aromatica |
| Snakeroot, Virginia |
Endodeca serpentaria |
| Snakeroot, White |
Ageratina altissima var. altissima |
| Snakeroot, White |
Ageratina altissima var. altissima |
| Snapdragon, Dwarf |
Chaenorhinum minus |
| Sneezeweed, Autumn |
Helenium autumnale |
| Sneezeweed, Purple-head |
Helenium flexuosum |
| Snowball, Japanese |
Viburnum plicatum |
| Snowdrops |
Galanthus nivalis |
| Snowflake, Summer |
Leucojum aestivum |
| Solomon's-seal |
Polygonatum biflorum var. biflorum |
| Solomon's-seal, Downy |
Polygonatum pubescens |
| Solomon's-seal, Giant |
Polygonatum biflorum var. commutatum |
| Sowthistle, Delectable |
Sonchus oleraceus |
| Sowthistle, Spiny-leaf |
Sonchus asper |
| Spanish Needles |
Bidens bipinnata |
| Spatterdock |
Nuphar advena |
| Spearmint |
Mentha spicata |
| Spearscale |
Atriplex prostrata |
| Speedwell |
Veronica polita |
| Speedwell, Bird-eye |
Veronica persica |
| Speedwell, Common |
Veronica officinalis |
| Speedwell, Corn |
Veronica arvensis |
| Speedwell, Ivyleaf |
Veronica hederifolia |
| Speedwell, Perscians' |
Veronica persica |
| Speedwell, Thyme-leaved |
Veronica serpyllifolia |
| Speedwell, Water |
Veronica anagallis-aquatica |
| Spicebush, Smooth |
Lindera benzoin var. benzoin |
| Spiderflower |
Tarenaya hassleriana |
| Spiderwort, Virginia |
Tradescantia virginiana |
| Spikegrass, Broad |
Chasmanthium latifolium |
| Spikemoss, Meadow |
Lycopodioides apodum |
| Spikenard, American |
Aralia racemosa |
| Spikerush, Slender |
Eleocharis tenuis var. tenuis |
| Spikerush, Tree-angle |
Eleocharis tricostata |
| Spiraea, Bridal-wreath |
Spiraea prunifolia |
| Spiraea, Broad-leaf White |
Spiraea alba var. latifolia |
| Spiraea, Japanese |
Spiraea japonica |
| Spleenwort, Ebony |
Asplenium platyneuron |
| Spleenwort, Silvery False |
Deparia acrostichoides |
| Springbeauty, Narrowleaf |
Claytonia virginica var. virginica |
| Spurge, Cypress |
Euphorbia cyparissias |
| Spurge, Eyebane |
Euphorbia nutans |
| Spurge, Flowering |
Euphorbia corollata |
| Spurge, Seaside |
Euphorbia polygonifolia |
| Spurge, Spotted |
Euphorbia maculata |
| Spurge, Variable-leaf |
Euphorbia ipecacuanhae |
| St. Johnswort, Alien |
Hypericum perforatum |
| St. Johnswort, Canadian |
Hypericum canadense |
| St. Johnswort, Dotted |
Hypericum punctatum |
| St. Johnswort, Marsh |
Hypericum virginicum |
| St. Johnswort, Orange-grass |
Hypericum gentianoides |
| St. Johnswort, Shrubby |
Hypericum prolificum |
| St. Johnswort, Slender |
Hypericum mutilum var. mutilum |
| Star-of-bethlehem |
Ornithogalum umbellatum |
| Stargrass, Eastern Yellow |
Hypoxis hirsuta |
| Starwort, Longleaf |
Stellaria longifolia |
| Starwort, Medium |
Stellaria media |
| Stickseed, Virginia |
Hackelia virginiana |
| Stickywilly |
Galium aparine |
| Stonecrop, Ditch |
Penthorum sedoides |
| Stonecrop, Woodland |
Sedum ternatum |
| Stork's-bill |
Erodium cicutarium |
| Stork's-bill |
Erodium cicutarium |
| Strawberry, Indian |
Potentilla indica |
| Strawberry, Virginia |
Fragaria virginiana |
| Strawberry-bush, American |
Euonymus americanus |
| Sumac, Hairy |
Rhus typhina |
| Sumac, Smooth |
Rhus glabra |
| Sumac, Winged |
Rhus copallinum |
| Sundew, Spoon-leaved |
Drosera intermedia |
| Sundrops, Small |
Oenothera perennis |
| Sunflower, Domesticated |
Helianthus annuus |
| Sunflower, Swamp |
Helianthus angustifolius |
| Sunflower, Tall |
Helianthus giganteus |
| Sunflower, Thinleaf |
Helianthus decapetalus |
| Sunflower, Tick-seed |
Bidens polylepis |
| Sunflower, Woodland |
Helianthus divaricatus |
| Swamp Candles |
Lysimachia terrestris |
| Swamp-pink |
Helonias bullata |
| Sweet Betsy |
Trillium cuneatum |
| Sweet-breath-of-spring |
Lonicera fragrantissima |
| Sweet-cicely, Bland |
Osmorhiza claytonii |
| Sweet-cicely, Scented |
Osmorhiza longistylis |
| Sweet-gum |
Liquidambar styraciflua |
| Sweet-william |
Dianthus barbatus |
| Sweetclover, White |
Melilotus albus |
| Sweetclover, Yellow |
Melilotus officinalis |
| Sweetflag, European |
Acorus calamus |
| Sycamore |
Platanus occidentalis |