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Sequoia
     sempervirens

     wellingtonia
Sequoia,
     Giant (Sequoia sempervirens)

     Giant (Sequoiadendron giganteum)
Sequoiadendron giganteum
Serapias helleborine
Sericea Lespedeza (Lespedeza cuneata)
Sericocarpus asteroides
Serratula arvensis
Serviceberry, Clumping (Amelanchier canadensis ‘Lamarckii’)
Sessile Bellwort (Uvularia sessilifolia)
Sessile-leaved Bellwort (Uvularia sessilifolia)
Sesuvium portulacastrum
Setaria
     faberi

     pumila
     viridis
Seven-angle Pipewort (Eriocaulon aquaticum)
Seven-sisters Rose (Rosa multiflora)
Seven-son Flower (Heptacodium miconioides)
Seychelles Stilt Palm (Verschaffeltia splendida)
Señita Cactus (Pachycereus schottii)
Shadbush
     (Amelanchier canadensis ‘Lamarckii’)

     (Amelanchier canadensis)
Shagbark Hickory (Carya ovata)
Shaggy
     Manes (Coprinus comatus)

     Soldier (Galinsoga quadriradiata)
Shallow Sedge (Carex lurida)
Shamrock,
     False (Oxalis triangularis)

     Purple (Oxalis triangularis)
     Wood (Oxalis montana)
Shank, Rooting (Xerula radicata)
Sharp Rush (Juncus acutus)
Sharp-leaved Aster (Oclemena acuminata)
Sharp-lobed Hepatica (Hepatica nobilis var. acuta)
Shasta Daisy (Leucanthemum × superbum)
Shaw’s Agave (Agave shawii)
Sheep
     Laurel (Kalmia angustifolia)

     Laurel (Kalmia latifolia)
     Sorrel (Rumex acetosella)
Sheepberry (Viburnum lentago)
Shelf,
     Sulphur (Laetiporus conifericola)

     Sulphur (Laetiporus gilbertsonii)
     Sulphur (Laetiporus sulphureus)
Shell Ginger (Alpinia zerumbet)
Shellflower (Chelone glabra)
Shepherdia argentea
Shepherd’s-purse (Capsella bursa-pastoris)
Shield, Persian (Strobilanthes dyerianus)
Shin Dagger (Agave lechuguilla)
Shining
     Bur Sedge (Carex intumescens)

     Sumac (Rhus copallinum)
Shinleaf (Pyrola elliptica)
Shinleaf,
     Common (Pyrola elliptica)

     Rounded (Pyrola americana)
Shinners’ Three-awned Grass (Aristida dichotoma)
Shoe-string Acacia (Acacia stenophylla)
Shooting Star (Dodecatheon pulchellum)
Shorthusk, Bearded (Brachyelytrum erectum)
Shortia galacifolia
Shortleaf Fig (Ficus citrifolia)
Shotweed (Cardamine hirsuta)
Showy
     Aster (Eurybia spectabilis)

     Four O’clock (Mirabilis multiflora)
     Goat’s-beard (Tragopogon lamottei)
     Goldenrod (Solidago speciosa)
     Orchis (Galearis spectabilis)
     Skullcap (Scutellaria serrata)
     Tick Trefoil (Desmodium canadense)
Shrimp Bush (Justicia brandegeana)
Shrimp, Red (Justicia brandegeana)
Shrooms (Psilocybe cubensis)
Shrub
     Verbena (Lantana camara cv.)

     Verbena (Lantana × ‘Pink Caprice’)
Shrub,
     Bird-of-paradise (Caesalpinia gilliesii)

     Sweet (Calycanthus floridus)
     Tallow (Myrica cerifera)
Shrubby Cinquefoil (Dasiphora fruticosa ssp. floribunda)
Sibbaldiopsis tridentata
Siberian
     Alder (Alnus viridis)

     Dogwood (Cornus alba ‘Bailhalo’)
     Squill (Scilla siberica)
Sicyos lobata
Sideroxylon
     celastrinum

     salicifolium
Siebold Viburnum (Viburnum sieboldii)
Sierra
     Boykinia (Boykinia major)

     Redwood (Sequoiadendron giganteum)
Silene
     alba

     flos-cuculi
     latifolia
     latifolia ssp. alba
     pratensis
     virginica
Silk Floss Tree (Ceiba speciosa)
Silktree (Albizia julibrissin)
Silktree,
     Persian (Albizia julibrissin)

     Pink (Albizia julibrissin)
Silkweed, Swamp (Asclepias incarnata)
Silky
     Beach Pea (Lathyrus littoralis)

     Bush Clover (Lespedeza cuneata)
     Dogwood (Cornus obliqua)
     Net Bush (Calothamnus villosus)
Silly False Pine (Preposterosus towerus var. pseudopinus)
Silphium perfoliatum
Silver
     Birch (Betula papyrifera)

     Buffaloberry (Shepherdia argentea)
     Cassia (Senna phyllodinea)
     Dollar Fern (Rumohra adiantiformis)
     Dollars (Lunaria annua)
     Leaf Tree (Leucadendron argenteum)
     Maple (Acer saccharinum)
     Speedwell (Veronica spicata ssp. incana)
     Thicket (Euphorbia stenoclada)
     Tree (Leucadendron argenteum)
     and Gold Red Osier Dogwood (Cornus sericea ‘Silver and Gold’)
Silver-leaved Cinquefoil (Potentilla argentea)
Silverbeet (Beta vulgaris ssp. cicla)
Silverbell, Carolina (Halesia tetraptera)
Silverberry,
     Ebbing’s (Elaeagnus × ebbingei ‘Gilt Edge’)

     Japanese (Elaeagnus umbellata)
Silvergrass, Chinese (Miscanthus sinensis)
Silverleaf
     Maple (Acer saccharinum)

     Mountain Mint (Pycnanthemum incanum)
Silverline Locoweed (Astragalus tephrodes)
Silverrod (Solidago bicolor)
Silversword, Haleakalā (Argyroxiphium sandwicense ssp. macrocephalum)
Silverweed
     (Argentina anserina)

     (Argentina egedii)
     Cinquefoil (Argentina anserina)
Silverweed, Eged’s (Argentina egedii)
Silwerboom (Leucadendron argenteum)
Simarouba glauca
Simmondsia
     californica

     chinensis
Simpler’s Joy (Verbena hastata)
Sinapis
     alba

     juncea
Single-spored Map Lichen (Rhizocarpon disporum)
Singleleaf Piñon (Pinus monophylla)
Sinningia speciosa
Sisymbrium
     alliaria

     linearifolium
     officinale
     officinale var. leiocarpum
Sisyrinchium
     angustifolium

     arenicola
     bermudiana
     fuscatum
     graminoides
     idahoense
     incrustatum
     intermedium
     mucronatum
     rufipes
Sitka
     Alder (Alnus viridis)

     Spruce (Picea sitchensis)
Skimmia japonica
Skimmia, Japanese (Skimmia japonica)
Skullcap,
     Allegheny (Scutellaria serrata)

     Common (Scutellaria galericulata)
     Hooded (Scutellaria galericulata)
     Marsh (Scutellaria galericulata)
     Showy (Scutellaria serrata)
Skunk
     Cabbage (Symplocarpus foetidus)

     Meadowrue (Thalictrum revolutum)
Sky Blue Aster (Symphyotrichum oolentangiense)
Slash Pine (Pinus elliottii)
Sleder Glasswort (Salicornia depressa)
Slender
     Blue Flag (Iris prismatica)

     Bush Clover (Lespedeza virginica)
     Fragrant Goldenrod (Euthamia caroliniana)
     Glasswort (Salicornia depressa)
     Goldentop (Euthamia caroliniana)
     Mannagrass (Glyceria melicaria)
     Rush (Juncus tenuis)
     Speedwell (Veronica filiformis)
     Toothwort (Cardamine angustata)
     Vetch (Vicia tetrasperma)
     Willow Herb (Epilobium ciliatum)
Slime Mold (Physarum polycephalum)
Slipper Plant (Pedilanthus macrocarpus)
Small
     Broomrape (Orobanche minor)

     Cranberry (Vaccinium oxycoccos)
     Hop Clover (Trifolium dubium)
     Purple Fringed Orchid (Platanthera psycodes)
     Spotted Sandmat (Chamaesyce vermiculata)
     White Aster (Symphyotrichum racemosum)
     Yellow Lady’s Slipper (Cypripedium parviflorum var. parviflorum)
     Yellow Onion (Allium flavum)
Small-flowered
     Agalinis (Agalinis paupercula)

     Agrimony (Agrimonia parviflora)
     Fiddleneck (Amsinckia menziesii var. intermedia)
     White Aster (Symphyotrichum racemosum)
Small-headed Sunflower (Helianthus microcephalus)
Smallflower
     Agave (Agave parviflora)

     Century Plant (Agave parviflora)
Small’s Ragwort (Packera anonyma)
Smartweed,
     Carey’s (Polygonum careyi)

     Dock-leaved (Polygonum lapathifolium)
     Nodding (Polygonum lapathifolium)
Smartweed,
     Pale (Polygonum lapathifolium)

     Pennsylvania (Polygonum pensylvanicum)
     Water (Polygonum amphibium)
Smelling Stick (Sassafras albidum)
Smilacina
     ciliata

     flexicaulis
     racemosa
     racemosa var. cylindrata
     racemosa var. lanceolata
     racemosa var. typica
Smilax [Genus]
Smilax
     bona-nox

     bona-nox var. exauriculata
     bona-nox var. hastata
     bona-nox var. hederifolia
     herbacea
     megacarpa
     rotundifolia
     rotundifolia var. crenulata
     rotundifolia var. quadrangularis
     walteri
Smirnow Rhododendron (Rhododendron smirnowii)
Smock, Lady’s (Cardamine pratensis)
Smoke Tree (Psorothamnus spinosus)
Smoke, Prairie (Geum triflorum)
Smokethorn
     (Psorothamnus spinosus)

     Dalea (Psorothamnus spinosus)
Smoketree, American (Cotinus obovatus)
Smoky-eye Boulder Lichen (Porpidia albocaerulescens)
Smooth
     Alder (Alnus serrulata)

     Bedstraw (Galium mollugo)
     Beggartick (Bidens laevis)
     Bidens (Bidens laevis)
     Black Sedge (Carex nigra)
     Blue American-aster (Symphyotrichum laeve)
     Blue Aster (Symphyotrichum laeve)
     Bur Marigold (Bidens laevis)
     Carrion Flower (Smilax herbacea)
     Chain-fruit Cholla (Cylindropuntia fulgida var. fulgida)
     Gerardia (Agalinis purpurea)
     Goldenrod (Solidago gigantea)
     Herbaceous Greenbrier (Smilax herbacea)
     Hydrangea (Hydrangea arborescens ‘Dardom’)
     Mountain Prickly Pear (Opuntia ficus-indica)
     Prickly Pear (Opuntia ficus-indica)
     Rock Tripe (Umbilicaria mammulata)
     Solomon's Seal (Polygonatum biflorum)
     Solomon’s-seal (Polygonatum biflorum)
     Sumac (Rhus glabra)
     Trailing Bush-clover (Lespedeza repens)
Snail-seed Pondweed (Potamogeton bicupulatus)
Snake
     Aloe (Aloe broomii)

     Cactus (Echinocereus pensilis)
Snake-head (Chelone glabra)
Snakeberry
     (Actaea rubra)

     (Clintonia borealis)
Snakeroot,
     Black (Actaea racemosa var. racemosa)

     Black (Actaea racemosa)
     Canadian (Asarum canadense)
     Lesser (Ageratina aromatica)
     Sticky (Ageratina adenophora)
     White (Ageratina altissima ‘Chocolate’)
     White (Ageratina altissima)
Snakeweed (Gutierrezia sarothrae)
Snakeweed, Sticky (Gutierrezia microcephala)
Snapdragon (Antirrhinum)
Snapweed (Cardamine hirsuta)
Sneezeweed,
     Common (Helenium autumnale)

     Southeastern (Helenium pinnatifidum)
Snow
     Melanthera (Melanthera nivea)

     Squarestem (Melanthera nivea)
Snowball Tree (Viburnum opulus)
Snowball, Wild (Ceanothus americanus)
Snowbell (Styrax americanus)
Snowberry,
     Common (Symphoricarpos albus)

     Western (Symphoricarpos occidentalis)
Snowflake Aloe (Aloe rauhii)
Snowy Thistle (Cirsium occidentale var. candidissimum)
Soap Grass (Xerophyllum tenax)
Soaptree Yucca (Yucca elata)
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
     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
     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

     arbutifolia
     aucuparia
     aucuparia var. xanthocarpa
Sorghastrum
     avenaceum

     nutans
Sorrel,
     Field (Rumex acetosella)

     Red (Rumex acetosella)
     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)
     Cattail (Typha domingensis)
     Cypress (Taxodium distichum)
     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)
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