Sachalin Polygonum sachalinense Buckwheat
Sage, White (see Mugwort, Western/ White Sage)
Sage, Wood (see Germander/ Wood-Sage)
Sandwort, Thyme-Leaved Arenaria serpyllifolia Pink
Sapgum (see Sweetgum)
Sarsaparilla, Wild Aralia nudicaulis Ginseng
Sassafras Sassafras albidum Laurel
Satyr's beard mushroom Miscellaneous Fungi
Saxifrage, Early Saxifraga virginiensis Saxifrage
Scrambled egg slime Fuligo septica Crusts And Slimes
Sedge, awl-fruited Carex sstipata Sedge
Sedge, bur-reed Carex sparganoides Sedge
Sedge, Cherokee (see Sedge, wolftail)
Sedge, fox Carex sparganoides Sedge
Sedge, Gray's (see Sedge, morning star)
Sedge, greenwhite Carex albolutescens Sedge
Sedge, Hop Carex lupulina Sedge
Sedge, morning star Carex grayi Sedum (Orpine)
Sedge, star Carex echinata Sedge
Sedge, Umbrella Cyperus strigosus Sedge
Sedge, wolftail Carex cherokeensis Sedge
Sedum, dwarf white Sedum alba Sedum (Orpine)
Seedbox Ludwigia alternifolia Evening Primrose
Self Heal (see Heal-All)
Senna, Wild Cassia hebecarpa Pea
Serviceberry Amelanchier arborea Rose
Shadbush (see Serviceberry)
Sharp scaled lepiota Gilled Mushrooms
Sharp scaled parasol Gilled Mushrooms
Sharp scales (see Pholiota, sharp-scaly)
Sheepberry (see Nannyberry)
Shepherd's Purse Capsella bursa-pastoris Mustard
Shield-Fern, Marginal (see Woodfern, Marginal)
Shield-Fern, Spinulose (see Woodfern, Spinulose)
Shinleaf (see Pyrola, Round-Leaved/ Shinleaf)
Silver Rod Solidago bicolor Goldenrod
Silverbell, Carolina Halesia carolina Snowbell (Storax)
Simocybe. American Simocybe centunculus Gilled Mushrooms
Skullcap, autumn (see Galerina, deadly)
Skullcap, Common (see Skullcap, Marsh)
Skullcap, Downy Scutellaria incana Mint
Skullcap, Heart-leaved Scutellaria ovata Mint
Skullcap, Hooded (see Skullcap, Marsh)
Skullcap, Mad-Dog Scutellaria leterifolia Mint
Skullcap, Marsh Scutellaria epilobiifolia Mint
Skullcap, smaller Scutellaria parvula Mint
Skunk Cabbage Symplocarpus foetidus Arum/Calla
Slime flux Lelliottia nimipressuralis Crusts And Slimes
Slime mold, autumn Mucilago, crustacea Crusts And Slimes
Smartweed, Common (see Water Pepper, Common Smartweed)
Smartweed, Long-Bristled Polygonum cespitosum Buckwheat
Smartweed, Pale/ Pale Polygonum Polygonum lapathifolium Buckwheat
Smartweed, Pennsylvania Polygonum pensylvanicum Buckwheat
Smoky eye-boulder lichen Porpidia albocaerulescens Lichen
Smoky-eye boulder lichen, Porpicia albocaerulescens
Snakeroot, Black Sanicula canadensis Parsley
Snakeroot, long-fruited Sanicula trifolia Parsley
Snakeroot, White Eupatorium rugosum Joe-Pye-Weed-Like
Snapdragon, Dwarf/ Small Toadflax Linaria minor (chaenorrhinum minus) Snapdragon (Figwort)
Sneezeweed Helenium autumnale Sunflower-Like
Snowberry Symphoricarpos albus Honeysuckle
Snowdrop Galanthus nivalis Amaryllis (Daffodil)
Soapwort (see Bouncing Bet/ Soapwort)
Solomon's Seal Polygonatum biflorum Lily
Solomon's Seal, False Smilacena racemosa Lily
Sorrel tree (see Sourwood)
Sorrel, Common (see Sorrel, Sheep/ Common Sorrel)
Sorrel, Sheep/ Common Sorrel Rumex acetosella Buckwheat
Sourgrass (see Wood-Sorrel, Yellow/ Sour Grass)
Sourwood Oxydendrum arboreum Heath
Sow-Thistle, Common Sonchus oleraceus Dandelion-Like
Sow-Thistle, Field Sonchus arvensis Dandelion-Like
Sow-Thistle, Spiny-Leaved Sonchus asper Dandelion-Like
Sowbane (see Goosefoot, Maple-Leaved)
Spearmint Mentha spicata Mint
Spearscale (see Orach)
Speedwell, Bird's Eye Veronica chamaedrys Snapdragon (Figwort)
Speedwell, Common Veronica officinalis Snapdragon (Figwort)
Speedwell, Corn Veronica arvensis Snapdragon (Figwort)
Speedwell, Field Veronica agrestis Snapdragon (Figwort)
Speedwell, Persian/ Bird's Eye Veronica persica Snapdragon (Figwort)
Speedwell, purslane Veronica peregrina Snapdragon (Figwort)
Speedwell, Thyme-Leaved Veronica serpyllifolia Snapdragon (Figwort)
Spicebush, common Lindera benzoin Laurel
Spider-Flower Cleome spinosa Caper
Spiderwort Tradescantia virginiana Spiderwort
Spikenard Aralea racemosa Ginseng
Spirea Rose
Spleenwort, ebony Asplenium platyneuron Fern
Splitgill Schizophyllum commune Mushrooms With Pores (Polypores)
Spring Beauty Claytonia virginica Purslane
Spring beauty, Carolina Claytonia caroliniana Purslane
Spruce, Canada (see Spruce, White)
Spruce, Colorado Blue Picea pungens Pine
Spruce, Hemlock (see Hemlock, Eastern)
Spruce, Norway Picea abies Pine
Spruce, Skunk (see Spruce, White)
Spruce, White Picea glauca Pine
Spurge, Cyprus/ Graveyard Weed Euphorbia cyparissias Spurge
Spurge, Flowering Euphorbia corollata Spurge
Spurge, Toothed Euphorbia dentata Spurge
Squaw-Weed (see Ragwort, Golden/ Squaw-Weed)
Squawroot Donofolis americana Broomrape
Squirrel-Corn Dicentra canadensis Poppy
St. Johnswort, Common Hypericum perforatum St. Johnswort
St. Johnswort, Dwarf Hypericum mutilum St. Johnswort
St. Johnswort, Pale Hypericum ellipticum St. Johnswort
St. Johnswort, Shrubby Hypericum spathulatum St. Johnswort
St. Johnswort, Spotted Hypericum punctatum St. Johnswort
Star of Bethlehem Ornithogalum umbellatum Lily
Starflower Trientalis borealis Primrose
Starwort (see Chickweed, Common/ Starwort)
Starwort, Bog/ Marsh Chickweed Stellaria alsine Pink
Steeplebush/ Hardhack Spirea tomentosa Rose
Sterile micelium Mycelia sterila Miscellaneous Fungi
Stickseed/ Beggar's-Lice Hackelia virginiana Forget-Me-Not/Borage
Sticktights (see Beggar-ticks, Devil's/ Sticktights)
Stinking Willie (see Wakerobin/ Red Trillium/ Stinking Willie/ Erect Trillium)
Stitchwort, Lesser Stellaria graminea Pink
Stitchwort, Long-Leaved (see Chickweed, Long-leaved/ Long Leaved Stitchwort)
Stonecrop, Ditch Penthorum sedoides Sedum (Orpine)
Stonecrop, stringy Sedum sarmentosum Sedum (Orpine)
Stonecrop, Wild Sedum ternatum Sedum (Orpine)
Strawberry, Indian Duchesnia indica Rose
Strawberry, Wild Fragaria virginiana Rose
Strawberry, Wood Fragaria vesca Rose
Stump flux Cryptococcus macerans Crusts And Slimes
Sugarberry (see Hackberry, American)
Sulphur shell (see Chicken of the woods)
Sumac, Smooth Rhus glabra Cashew (Sumac)
Sumac, Staghorn Rhus typhina Cashew (Sumac)
Sundrops Oenothera fruticosa Evening Primrose
Sundrops, Small Oenothera perennis Evening Primrose
Sunflower, Common Helianthus annuus Sunflower-Like
Sunflower, False (see Ox-Eye/ False Sunflower)
Sunflower, Giant (see Sunflower, Tall/ Giant Sunflower)
Sunflower, Rough-Leaved Helianthus strumosus Sunflower-Like
Sunflower, Small Wood Helianthus microcephalus Sunflower-Like
Sunflower, Tall/ Giant Sunflower Helianthus giganteus Sunflower-Like
Sunflower, Thin-Leaved Helianthis decapetalus Sunflower-Like
Sunflower, Woodland Helianthus divaricatus Sunflower-Like
Swamp candles (see Loosestrife, yellow)
Sweet Everlasting (see Catfoot/Sweet Everlasting)
Sweet William, Wild (see Phlox, Blue/ Wild Sweet William)
Sweet William, Wild/ Meadow Phlox Phlox maculata Phlox
Sweetgum Liquidambar styraciflua Witch-hazel
Sycamore, American Platanus occidentalis Sycamore
Tiarella cordifolia
Ribes cynosbati
Hyrangea quercifolia
Hydrangea arborescens
Mitella diphylla
Philadelphus coronarius
Saxifraga virginiensis
Scirpus validus
Scirpus atrovirens
Cyperus rivularis
Hydrangea paniculata
Carex sstipata
Carex sparganoides
Carex sparganoides
Carex albolutescens
Carex lupulina
Carex echinata
Cyperus strigosus
Carex cherokeensis
Scirpus pedicellatus
Carex grayi
Sedum alba
Penthorum sedoides
Sedum sarmentosum
Sedum ternatum
Penstemon digitalis
Penstemon hirsutus
Collinsia verna
Linaria vulgaris
Melampyrum lineare
Scrophularia marilandica
Digitalis purpurea
Gerardia virginica
Gerardia laevigata
Gratiola neglecta
Cymbalaria muralis
Mimulus ringens
Verbascum thapsis
Verbascum blatteria
Paulownia tomentosa
Linaria minor (chaenorrhinum minus)
Veronica chamaedrys
Veronica officinalis
Veronica arvensis
Veronica agrestis
Veronica persica
Veronica peregrina
Veronica serpyllifolia
Chelone glabra
Halesia carolina
Koelreuteria paniculata
Commelina communis
Tradescantia virginiana
Acalpha virginica
Euphorbia supina
Euphorbia cyparissias
Euphorbia corollata
Euphorbia dentata
Hypericum perforatum
Hypericum mutilum
Hypericum ellipticum
Hypericum spathulatum
Hypericum punctatum
Celastrus scandens
Celastrus orbiculatus
Platanus occidentalis