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Spanish
     Bluebells (Hyacinthoides hispanica)

     Dagger (Yucca baccata)
     Moss (Tillandsia usneoides)
     Needles (Bidens alba)
Sparassis herbstii
Sparganium
     americanum

     californicum
     eurycarpum
     eurycarpum ssp. eurycarpum
Spathiphyllum [Genus]
Spathyema foetida
Spatterdock
     (Nuphar lutea ssp. advena)

     (Nuphar lutea)
Spatulate-leaved Sundew (Drosera intermedia)
Spear Lily (Doryanthes palmeri)
Spearmint (Mentha spicata)
Speckled Alder (Alnus incana ssp. rugosa)
Spectacle
     Pod (Dimorphocarpa wislizeni)

     Pod (Dithyrea californica)
Spectaclepod, Wizlizeni’s (Dimorphocarpa wislizeni)
Specularia perfoliata
Speedwell (Veronica spicata ssp. incana)
Speedwell,
     Broadleaf (Veronica austriaca ssp. teucrium)

     Common (Veronica officinalis)
     Corn (Veronica arvensis)
     Creeping (Veronica filiformis)
     Persian (Veronica persica)
     Silver (Veronica spicata ssp. incana)
     Slender (Veronica filiformis)
     Threadstalk (Veronica filiformis)
Spergularia
     rubra

     rubra var. perennans
Spermacoce terminalis
Sphaeralcea
     coulteri

     subhastata
Sphagnum [Genus]
Sphagnum Moss (Sphagnum)
Sphagnum
     acutifolium

     capillaceum
     capillifolium
     magellanicum
     nemoreum
     palustre
Spice Birch (Betula lenta)
Spicebush (Lindera benzoin)
Spicebush,
     Northern (Lindera benzoin var. pubescens)

     Northern (Lindera benzoin)
Spider
     Aloe (Aloe spinosissima)

     Flower (Cleome hassleriana)
     Plant (Cleome hassleriana)
Spiderflower, Bladderpod (Cleome isomeris)
Spiderwort
     (Tradescantia pallida ‘Purpurea’)

     (Tradescantia ‘Sweet Kate’)
     (Tradescantia)
Spiderwort,
     Pine (Tradescantia pinetorum)

     Pinewoods (Tradescantia pinetorum)
     Prairie (Tradescantia occidentalis)
     Virginia (Tradescantia virginiana)
     Western (Tradescantia occidentalis)
Spigelia marilandica
Spiked
     Mint Bush (Prostanthera phylicifolia)

     Woolly Speedwell (Veronica spicata ssp. incana)
Spikenard, False (Maianthemum racemosum ssp. racemosum)
Spilanthes
     acmella

     oleracea
Spindle, Winged (Euonymus alatus)
Spindles, Golden (Clavulinopsis fusiformis)
Spineless Prickly Pear (Opuntia laevis)
Spinulose
     Wood Fern (Dryopteris carthusiana)

     Woodfern (Dryopteris carthusiana)
Spiny
     Barrel Cactus (Ferocactus cylindraceus)

     Black Olive (Bucida molinetii)
     Rush (Juncus acutus)
     Senna (Senna armata)
     Sowthistle (Sonchus asper)
Spiny-leaved
     Sow Thistle (Sonchus asper)

     Sow-thistle (Sonchus asper)
Spiraea
Spiraea
     alba

     tomentosa
     tomentosa var. rosea
     tomentosa var. tomentosa
Spiraea, False (Astilbe simplicifolia ‘White Wings’)
Spiral Ginger (Costus barbatus)
Spiranthes
     cernua

     cernua var. incurva
Spleenwort,
     Maidenhair (Asplenium trichomanes ssp. trichomanes)

     Narrow-leaved (Diplazium pycnocarpon)
Splendid
     Feather Moss (Hylocomium splendens)

     Palm (Verschaffeltia splendida)
Splitleaf Indian Paintbrush (Castilleja rhexiifolia)
Spoon Jade (Crassula portulacea)
Spoon, Desert (Dasylirion wheeleri)
Spoonleaf Sundew (Drosera intermedia)
Spoonwood (Kalmia latifolia)
Sporobolus heterolepis
Spotted
     Cort (Cortinarius iodes)

     Dead Nettle (Lamium maculatum)
     Felt Lichen (Sticta fuliginosa)
     Geranium (Geranium maculatum)
     Jewelweed (Impatiens capensis)
     Joe-Pye Weed (Eupatoriadelphus dubius)
     Joe-Pye Weed (Eupatoriadelphus maculatus var. maculatus)
     Joe-Pye Weed (Eupatoriadelphus maculatus)
     Knapweed (Centaurea stoebe ssp. micranthos)
     Ladysthumb (Polygonum persicaria)
     Parsley (Cicuta maculata)
     Pipsissewa (Chimaphila maculata)
     Sandmat (Chamaesyce maculata)
     Spurge (Chamaesyce maculata)
     Spurge (Chamaesyce vermiculata)
     St. John’s-wort (Hypericum punctatum)
     Trumpet-weed (Eupatoriadelphus maculatus var. maculatus)
     Trumpet-weed (Eupatoriadelphus maculatus)
     Water Hemlock (Cicuta maculata)
     Wintergreen (Chimaphila maculata)
Sprawling Prickly Pear (Opuntia littoralis)
Spreading
     Dogbane (Apocynum androsaemifolium)

     Globeflower (Trollius laxus)
     Jacob’s Ladder (Polemonium reptans)
     Wood Fern (Dryopteris carthusiana)
     Wood Fern (Dryopteris expansa ‘Recurva’)
Sprenger’s Asparagus (Asparagus densiflorus ‘Sprengeri’)
Spring
     Cress (Cardamine bulbosa)

     Draba (Draba verna)
     Goldenglow (Forestiera pubescens)
     Herald (Forestiera pubescens)
     Onion (Allium tricoccum)
     Whitlow-mustard (Draba verna)
Spring-beauty, Virginia (Claytonia virginica)
Spruce,
     Black (Picea mariana)

     Blue (Picea pungens)
     Canadian (Picea glauca)
     Cat (Picea glauca)
     Colorado (Picea pungens)
     Eastern (Picea rubens)
     Hemlock (Tsuga canadensis)
     Norway (Picea abies)
     Porsild (Picea glauca)
     Red (Picea rubens)
     Sitka (Picea sitchensis)
     Skunk (Picea glauca)
     White (Picea glauca)
     Yellow (Picea rubens)
Spurge (Euphorbia cyparissias)
Spurge,
     Alleghany (Pachysandra procumbens)

     Blackbird (Euphorbia ‘Blackbird’)
     Cypress (Euphorbia cyparissias)
     Hairy (Chamaesyce vermiculata)
     Indiantree (Euphorbia tirucalli)
     Japanese (Pachysandra terminalis)
     Mediterranean (Euphorbia characias)
     Mottled (Euphorbia lactea)
     Prostrate (Chamaesyce maculata)
     Spotted (Chamaesyce maculata)
     Spotted (Chamaesyce vermiculata)
     Squaw (Chamaesyce melanadenia)
     Thyme-leafed (Euphorbia serpyllifolia)
Spurred Butterfly Pea (Centrosema virginianum)
Square-stemmed Monkeyflower (Mimulus ringens)
Squarestem, Snow (Melanthera nivea)
Squash,
     Pattypan (Cucurbita pepo)

     Summer (Cucurbita pepo)
Squat Milkweed (Asclepias linearis)
Squaw
     Grass (Xerophyllum tenax)

     Spurge (Chamaesyce melanadenia)
     Vine (Mitchella repens)
Squawfeather (Castilleja integra)
Squill,
     Red (Urginea maritima)

     Siberian (Scilla siberica)
Squirrel Corn (Dicentra canadensis)
Squirrel-corn (Dicentra canadensis)
St.
     John’s Wort (Hypericum perforatum)

     Peter’s Palm (Yucca filifera)
Stachys
     byzantina ‘Silver Carpet’

     chamissonis var. cooleyae
     ciliata
     coccinea
     cooleyae
     grandiflora
     macrantha
Stachytarpheta
     indica

     jamaicensis
Staff, Jacob’s (Fouquieria splendens)
Staghorn
     Cholla (Cylindropuntia versicolor)

     Sumac (Rhus typhina)
Stairstep Moss (Hylocomium splendens)
Stairway to Heaven (Polemonium reptans)
Stalked Water-horehound (Lycopus rubellus)
Stammerwort (Ambrosia artemisiifolia)
Stanleya pinnata
Stansbury Cliffrose (Purshia stansburiana)
Stapelia
     gigantea

     nobilis
Star
     Grass (Hypoxis hirsuta)

     Ipomoea (Ipomoea hederifolia)
     Reindeer Lichen (Cladina stellaris)
     Ruby Red Grapefruit (Citrus × aurantium ‘Star Ruby Red’)
     Sedge (Carex echinata)
     of Bethlehem (Ornithogalum umbellatum)
Star,
     Blazing (Liatris spicata)

     Blue (Amsonia ‘Blue Ice’)
     Golden (Chrysogonum virginianum)
     May (Trientalis borealis)
     Sabi (Adenium obesum)
     Scarlet (Guzmania lingulata)
     Shooting (Dodecatheon pulchellum)
Star-of-Bethlehem
     (Ornithogalum umbellatum)

     (Trientalis borealis)
Star-tipped Reindeer Lichen (Cladina stellaris)
Starfish Fungus (Aseröe rubra)
Starflower (Trientalis borealis)
Stargazer Lily (Lilium ‘Stargazer’)
Starleaf-gum (Liquidambar styraciflua)
Starrush Whitetop (Rhynchospora colorata)
Starwort,
     Grass-leaf (Stellaria graminea)

     Grass-like (Stellaria graminea)
     Grassleaf (Stellaria graminea)
     Little (Stellaria graminea)
Steeplebush (Spiraea tomentosa)
Steironema
     ciliatum

     pumilum
Stellaria
     graminea

     graminea var. latifolia
     media
Stenactis annua
Stenanthium
     gramineum var. robustum

     robustum
Stenocereus
     alamosensis

     marginatus
     peruvianus
Stenolobium stans
Stephanandra incisa cv. Crispa
Stephanandra, Cutleaf (Stephanandra incisa cv. Crispa)
Stereum
     complicatum

     ostrea
Stetsonia coryne
Stick,
     Gout (Jatropha podagrica)

     Smelling (Sassafras albidum)
Sticks
     of Fire (Euphorbia tirucalli ‘Rosea’)

     of Fire (Euphorbia tirucalli)
     on Fire Milk Bush (Euphorbia tirucalli)
Sticktights
     (Bidens frondosa)

     (Bidens laevis)
Stickweed (Ambrosia artemisiifolia)
Sticky
     Monkeyflower (Diplacus aurantiacus ssp. aurantiacus)

     Snakeroot (Ageratina adenophora)
     Snakeweed (Gutierrezia microcephala)
Sticta
     fuliginosa

     pulmonaria
     sylvatica var. fuliginosa
Stictina
     fuliginosa

     fuliginosa
Stiff Aster (Ionactis linariifolius)
Stiffhair Sunflower (Helianthus hirsutus)
Stinging Nettle (Urtica dioica)
Stinkbomb Tree (Ginkgo biloba)
Stinkhorn,
     Dog (Mutinus elegans)

     Elegant (Mutinus elegans)
     Headless (Mutinus elegans)
Stinking
     Benjamin (Trillium erectum)

     Iris (Iris foetidissima)
Stinkweed (Datura stramonium)
Stipa tenuissima
Stitchwort, Common (Stellaria graminea)
Stone Clover (Trifolium arvense)
Stonecrop
     (Sedum japonicum var. senanense)

     (Sedum rupestre ‘Angelina’)
Stonecrop,
     Cliff (Sedum nevii)

     Nevius’ (Sedum nevii)
Stopper, Bottle (Eriogonum inflatum)
Storksbill (Erodium cicutarium)
Stout Goldenrod (Solidago squarrosa)
Straw
     Foxglove (Digitalis lutea)

     Lily (Clintonia borealis)
Strawbell (Uvularia perfoliata)
Strawberry
     (Fragaria ×ananassa ssp. ananassa)

     Arbutus (Arbutus ‘Marina’)
     Bush (Euonymus americanus)
     Hedgehog (Echinocereus brandegeei)
     Hedgehog (Echinocereus engelmannii)
     Tree (Arbutus menziesii)
Strawberry,
     Alpine (Fragaria vesca)

     Barren (Waldsteinia fragarioides)
     Common (Fragaria virginiana)
     Indian (Duchesnea indica)
     Mock (Duchesnea indica)
     Ornamental (Fragaria ‘Red Ruby’)
     Virginia (Fragaria virginiana)
     White (Fragaria vesca)
     Wild (Fragaria virginiana)
Strelitzia
     nicolai

     reginae
Streptopus lanuginosus
Stretchberry (Forestiera pubescens)
Striped
     Cream Violet (Viola striata)

     Maple (Acer pensylvanicum)
     Wintergreen (Chimaphila maculata)
Strobilanthes
     dyeriana

     dyerianus
Strobilomyces strobilaceus
Strobilurus conigenoides
Strobus strobus
Strombocarpa odorata
Strongback, Smooth (Bourreria succulenta)
Strongbark (Bourreria succulenta)
Strongbark, Bahama (Bourreria succulenta)
Strophocaulos arvensis
Stubby-stalked Cladonia (Cladonia caespiticia)
Stylophorum diphyllum
Styrax [Genus]
Styrax
     americanus

     americanus var. pulverulentus
     pulverulentus
Suaeda
     americana

     calceoliformis
     depressa
     depressa var. erecta
     maritima var. americana
     minutiflora
     occidentalis
Succulent Lupine (Lupinus succulentus)
Sugar
     Cane (Saccharum)

     Maple (Acer saccharum)
     Palm (Arenga pinnata)
     Pine (Pinus lambertiana)
Sugarberry (Celtis laevigata var. reticulata)
Suillus
     paluster

     spraguei
Sulphur
     Cinquefoil (Potentilla recta)

     Firedot (Caloplaca flavovirescens)
     Flower (Eriogonum umbellatum)
     Shelf (Laetiporus conifericola)
     Shelf (Laetiporus gilbertsonii)
     Shelf (Laetiporus sulphureus)
Sumac,
     Flameleaf (Rhus copallinum)

     Lemonade (Rhus integrifolia)
     Littleleaf (Rhus microphylla)
     Shining (Rhus copallinum)
     Smooth (Rhus glabra)
     Staghorn (Rhus typhina)
     Winged (Rhus copallinum)
Summer
     Grape (Vitis aestivalis)

     Phlox (Phlox paniculata ‘Bright Eyes’)
     Squash (Cucurbita pepo)
Summer-cypress (Bassia scoparia)
Sunburst lichen (Xanthoria elegans)
Sunchoke (Helianthus tuberosus)
Sundance (Gaillardia pulchella)
Sundew (Drosera capensis)
Sundew,
     Common (Drosera rotundifolia)

     Oblong-leaved (Drosera intermedia)
     Spatulate-leaved (Drosera intermedia)
     Spoonleaf (Drosera intermedia)
Sundial (Lupinus perennis)
Sundrops (Oenothera fruticosa ssp. glauca)
Sundrops,
     Common (Oenothera fruticosa)

     Lavenderleaf (Calylophus lavandulifolius)
     Prairie (Oenothera pilosella)
Sunflower (Helianthus annuus)
Sunflower,
     Desert (Geraea canescens)

     Hairy (Helianthus hirsutus)
     Mexican (Tithonia rotundifolia ‘Torch’)
     Small-headed (Helianthus microcephalus)
     Stiffhair (Helianthus hirsutus)
     Tickseed (Bidens frondosa)
     Woodland (Helianthus divaricatus)
Sunken rim-lichen (Lecanora oreinoides)
Sunroot (Helianthus tuberosus)
Susan, Black-eyed (Rudbeckia hirta)
Suzanne’s Aloe (Aloe suzannae)
Swallowort, Black (Cynanchum louiseae)
Swamp
     Agrimony (Agrimonia parviflora)

     Apple (Annona glabra)
     Aster (Symphyotrichum puniceum)
     Azalea (Rhododendron viscosum)
     Beggar’s Tick (Bidens connata)
     Buttercup (Ranunculus hispidus var. caricetorum)
     Cabbage (Sabal palmetto f.)
     Cabbage (Symplocarpus foetidus)
     Candles (Lysimachia terrestris)
     Cypress (Taxodium distichum)
     Dewberry (Rubus hispidus)
     Dogwood (Cornus foemina)
     Dogwood (Cornus obliqua)
     Holly (Ilex mucronata)
     Horsetail (Equisetum fluviatile)
     Maple (Acer rubrum)
     Milkweed (Asclepias incarnata)
     Pink (Helonias bullata)
     Rose (Rosa palustris)
     Silkweed (Asclepias incarnata)
     Tupelo (Nyssa sylvatica)
     Vervain (Verbena hastata)
     White Oak (Quercus bicolor)
Swamp-cedar (Chamaecyparis thyoides)
Swamp-honeysuckle (Rhododendron viscosum)
Swamp-loosestrife (Decodon verticillatus)
Swampweed, Pacific (Sarcocornia pacifica)
Sweatroot (Polemonium reptans)