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