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Soapweed
     (Yucca glauca)

     Yucca (Yucca glauca)
Soapwort (Saponaria officinalis)
Soapwort, Common (Saponaria officinalis)
Society Garlic (Tulbaghia violaceae)
Soft
     Maple (Acer rubrum)

     Maple (Acer saccharinum)
     Rush (Juncus effusus)
Softleaf Yucca (Yucca arkansana)
Solanum
Solanum
     carolinense

     dulcamara
     hindsianum
     parishii
     pyracanthum
Soldier, Shaggy (Galinsoga quadriradiata)
Soldiers, British (Cladonia cristatella)
Soldierwood (Colubrina elliptica)
Soldier’s Woundwort (Achillea millefolium)
Solenostemon scutellarioides ‘Copper’
Solidago [Genus]
Solidago
     axillaris

     bicolor
     caesia
     caesia var. axillaris
     caesia var. caesia
     canadensis
     caroliniana
     chrysopsis
     flexicaulis
     gigantea
     gigantea ssp. serotina
     gigantea var. leiophylla
     gigantea var. pitcheri
     gigantea var. serotina
     gigantea var. shinnersii
     juncea
     juncea var. neobohemica
     juncea var. ramosa
     latifolia
     microcephala
     microphylla
     minor
     nemoralis
     odora
     pitcheri
     rugosa
     sarothrae
     sempervirens
     serotina
     serotinoides
     serotinoides
     simplex
     speciosa
     squarrosa
     stricta
     tenuifolia
     uliginosa
     ×leiophallax
Soliders, British (Cladonia cristatella)
Solomon’s
     Plume (Maianthemum racemosum ssp. racemosum)

     Seal (Polygonatum odoratum)
Solomon’s-seal,
     King (Polygonatum biflorum)

     Smooth (Polygonatum biflorum)
Sonchus
Sonchus
     asper

     asper ssp. asper
     asper ssp. glaucescens
     nymanii
     oleraceus
Sonora Barrel (Ferocactus echidne)
Sonoran
     Desert Ruellia (Ruellia californica)

     Jumping Cholla (Cylindropuntia fulgida var. fulgida)
Soprano Lilac Spoon African Daisy (Osteospermum ‘Osjaseclipur’)
Sorbus
     americana

     americana
     arbutifolia var. atropurpurea
     aucuparia
     aucuparia var. xanthocarpa
Sorghastrum
     avenaceum

     nutans
Sorrel,
     Field (Rumex acetosella)

     Red (Rumex acetosella)
     Redwood (Oxalis oregana)
     Sheep (Rumex acetosella)
     Wood (Oxalis montana)
Sotol
     (Dasylirion texanum)

     (Dasylirion wheeleri)
Sotol,
     Green (Dasylirion texanum)

     Texas (Dasylirion texanum)
Sour
     Fig (Carpobrotus edulis)

     Orange (Citrus ×aurantium ssp. aurantium)
     Weed (Rumex acetosella)
Sourtop Blueberry (Vaccinium myrtilloides)
Sourwood (Oxydendrum arboreum)
Southeastern Sneezeweed (Helenium pinnatifidum)
Southern
     Arrowwood (Viburnum recognitum)

     Bayberry (Myrica cerifera)
     Beeblossom (Gaura angustifolia)
     Blue Gum (Eucalyptus globulus)
     Butterly Weed (Gaura angustifolia)
     Cattail (Typha domingensis)
     Cypress (Taxodium distichum)
     Gaura (Gaura angustifolia)
     Live Oak (Quercus virginiana)
     Magnolia (Magnolia grandiflora)
     Maidenhair Fern (Adiantum capillus-veneris)
     Red Oak (Quercus falcata)
     Seaside Spurge (Euphorbia bombensis)
     Wax Myrtle (Myrica cerifera)
     White-cedar (Chamaecyparis thyoides)
     Wild Hyacinth (Camassia scilloides)
Southern-cypress (Taxodium distichum)
Southwestern Mock Vervain (Glandularia gooddingii)
Sow
     Thistle (Sonchus oleraceus)

     Thistle (Sonchus)
Sow-thistle, Spiny-leaved (Sonchus asper)
Sowthistle,
     Common (Sonchus oleraceus)

     Prickly (Sonchus asper)
     Spiny (Sonchus asper)
Spanish
     Bayonet (Yucca baccata)

     Bayonet (Yucca harrimaniae)
     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)

     Sansevieria (Sansevieria cylindrica)
Spear, African (Sansevieria cylindrica)
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
     ambigua

     coulteri
     hastulata
     subhastata
     subhastata ssp. connata
     subhastata ssp. latifolia
     subhastata ssp. martii
     subhastata ssp. pumila
     subhastata ssp. pumila
     subhastata ssp. thyrsoidea
     subhastata var. connata
     subhastata var. latifolia
     subhastata var. martii
     subhastata var. pumila
     subhastata var. pumila
     subhastata var. thyrsoidea
Sphaeropteris cooperi
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)
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)
Spikerush, Robbins’ (Eleocharis robbinsii)
Spikesedge, Whitehead (Kyllinga nemoralis)
Spilanthes
     acmella

     oleracea
Spinach, Navajo (Cleome serrulata)
Spindle, Winged (Euonymus alatus)
Spindles, Golden (Clavulinopsis fusiformis)
Spineless Prickly Pear (Opuntia laevis)
Spinulose Wood Fern (Dryopteris carthusiana)
Spinulum annotinum
Spiny
     Barrel Cactus (Ferocactus cylindraceus)

     Black Olive (Bucida molinetii)
     Hop Sage (Grayia spinosa)
     Menodora (Menodora spinescens)
     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
     romanzoffiana
     stricta
Spirea japonica ‘Neon Flash’
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 ovata)
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 (Eutrochium dubium)
     Joe-Pye Weed (Eutrochium maculatum)
     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 (Eutrochium maculatum)
     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)
St.
     John’s Wort (Hypericum perforatum)

     Peter’s Palm (Yucca filifera)
Stachys
     byzantina

     byzantina ‘Silver Carpet’
     chamissonis var. cooleyae
     ciliata
     coccinea
     cooleyae
     grandiflora
     macrantha
     olympica
Stachytarpheta
     indica

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

     Sumac (Rhus typhina)
Stairstep Moss (Hylocomium splendens)
Stairway to Heaven (Polemonium reptans)
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)
     Sedge (Rhynchospora colorata)
     of Bethlehem (Ornithogalum umbellatum)
Star,
     Blazing (Liatris spicata ‘Floristan Violet’)

     Blazing (Liatris spicata)
     Blue (Amsonia ‘Blue Ice’)
     Desert (Monoptilon bellioides)
     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 ‘Star Gazer’)
Starleaf-gum (Liquidambar styraciflua)
Starrush Whitetop (Rhynchospora colorata)
Starwort,
     Grass-leaf (Stellaria graminea)

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

     pumilum
Stellaria
     graminea

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

     robustum
Stenocereus
     alamosensis

     marginatus
     marginatus
     marginatus var. gemmatus
     peruvianus
Stenolobium stans
Stenotopsis
     interior

     linearifolia
     linearifolia var. interior
Stephanandra incisa cv. ‘Crispa’
Stephanandra, Cutleaf (Stephanandra incisa cv. ‘Crispa’)
Stephanomeria parryi
Sterculia rupestris
Stereum
     complicatum

     fasciatum
     lobatum
     ostrea
Stetsonia coryne
Stevensonia
     borsigiana

     grandifolia
     viridifolia
Stick,
     Gout (Jatropha podagrica)

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