172k | 190K | 160K | 123K | 145k | 120K | 158k | 169k |
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| Sabadilla | Veratrum | officinale |
| Sabadilla | Veratrum | sabadilla |
| Sacahuista | Nolina | microcarpa |
| Safflower | Carthamus | tinctorius |
| Saffron | Crocus | sativus |
| Sage | Salvia | |
| Sage-leaved Germander | Teucrium | scorodonia |
| Sage-leaved Rockrose | Cistus | salviifolius |
| Sago Palm | Cycas | revoluta |
| Saguaro Cactus | Carnegiea | gigantea |
| Salad Burnet | Poterium | sanguisorba |
| Salad Burnet | Sangiusorba | minor |
| Salad Burnet | Sanguisorba | minor |
| Sallol | Gaultheria | shallon |
| Salmon Jacob’s Ladder | Polemonium | carneum |
| Salmonberry | Rubus | spectabilis |
| Salparni | Desmodium | gangeticum |
| Salsify | Tragopogon | porrifolius |
| Saltbush | Atriplex | |
| Sambul Root | Ferula | suaveolens |
| San Pedro Cactus | Trichocereus | pachanoi |
| Sand Bluebonnet | Lupinus | subcarnosus |
| Sand Dropseed | Sporobolus | cryptandrus |
| Sand Plantain | Plantago | arenaria |
| Sand sage | Artemisia | filifolia |
| Sand Sedge | Carex | arenaria |
| Sandalwood | Santalum | |
| Sandarac | Thuja | articulata |
| San-pai-pi | Morus | indica |
| Santa Lucia Fir | Abies | bracteata |
| Santonica | Artemisia | cina |
| Sappan-wood | Caesalpinia | sappan |
| Sargent Cherry | Prunus | sargentii |
| saskatoon | Amelanchier | florida: |
| Sassafras | Sassafras | albidum |
| Sassafras | Sassafras | officinale: |
| Sassafras Goesianum | Massora | aromatica |
| Sassy Bark | Erythrophloeum | guineense |
| Satin-flower | Sisyrinchium | douglasii |
| Sauce Thyme | Thymus | zygis |
| Saucer Magnolia | Magnolia | x soulangiana |
| Savanilla Rhatany | Krameria | ixené |
| Savine | Juniperus | sabina |
| Savi’s Mud-rush | Scirpus | cernuus |
| Savory | Satureja | |
| Saw Palmetto | Sarenoa | serrulata |
| Saw Palmetto | Serenoa | repens |
| Sawara Falsecypress | Chamaecyparis | pisifera |
| Saxifrage | Saxifraga | x arendsii |
| Scarlet amaranth | Amaranthus | paniculatus |
| Scarlet Avens | Geum | coccineum |
| Scarlet Banksia | Banksia | coccinea |
| Scarlet Beard Tongue | Penstemon | hartwegii |
| Scarlet bidi-bidi | Acaena | microphylla |
| Scarlet Coral Pea | Kennedia | prostrata |
| Scarlet Firethorn | Pyracantha | coccinea |
| Scarlet Flame | Odontonema | strictum |
| Scarlet Flax | Linum | grandiflorum |
| Scarlet Flowered Gum | Eucalyptus | ficifolia |
| Scarlet Pimpernel | Anagallis | arvensis |
| Scarlet Plume | Euphorbia | fulgens |
| Scarlet Sage | Salvia | coccinea |
| Scarlet Thistle | Erythrolena | conspicua |
| Scarlet Turk’s Cap | Lilium | chalcedonicum |
| Scarlet Unique Geranium | Pelargonium | x ignescens |
| Scented Geraniums | Pelargonium | |
| Scentless Mayweed | Tripleurospermum | inodorum |
| Schisandra | Maximowicza | chinensis: |
| Schisandra | Schisandra | chinensis |
| Schisandra | Sphaerostema | japonica: |
| Scopolia | Scopolia | carniolica |
| Scorpion Senna | Coronilla | emerus |
| Scotch Asphodel | Tofieldia | palustris |
| Scotch Broom | Cytisus | scoparius |
| Scotch Elm | Ulmus | scabra |
| Scotch Heath | Erica | cinerea |
| Scotch Lovage | Ligusticum | scoticum |
| Scotch Pine | Pinus | sylvestris |
| Scotch Spearmint | Mentha | x gentilis var. parviflora |
| Scotch Thistle | Onopordum | acanthium |
| Scouler’s willow | Salix | scouleriana |
| scouring rush | Equisetum | hyemale |
| Screw-bean | Prosopis | pubescens |
| Scurvy Grass | Cochlearia | fenestrata |
| Sea Beet | Beta | maritima: |
| Sea Beet | Beta | vulgaris subsp. maritima |
| Sea Bindweed | Convolvulus | soldanella |
| Sea Buckthorn | Hippophaë | rhamnoides |
| Sea Foam Flower | Chenopodium | aristatum |
| Sea Holly | Eryngium | alpinum |
| Sea Holly | Eryngium | giganteum |
| Sea Holly | Eryngium | maritimum |
| Sea Holly | Eryngium | tripartitum |
| Sea Holly | Eryngium | variifolium |
| Sea Kale | Crambe | maritima |
| Sea Lavender | Limonium | latifolium |
| Sea Lettuce | Ulva | lactuca |
| Sea Onion | Ornithogalum | candatum |
| Sea Pea | Lathyrus | japonicus |
| Sea Plantain | Plantago | maritimo |
| Sea Purslane | Atriplex | portulacoides |
| Sea Purslane | Halimione | portulacoides |
| Sea Ragwort | Senecio | bicolor |
| Sea Rocket | Eruca | marina |
| Sea Thrift | Armeria | formosa |
| Sea Thrift | Armeria | maritima |
| Sea Thrift | Armeria | pseudoarmeria |
| Sea Wormwood | Artemisia | maritima |
| Sea-Blite | Suoeda | fruticosa |
| Sea-blites | Suoeda | |
| Sea-girdles | Laminaria | digitata |
| Seaholly | Eryngium | planum |
| Seaside Chamomile | Anthemis | maritima |
| Seaweed | Porphyra | laciniata |
| Seaweed | Porphyra | perforata |
| Seaweed | Porphyra | vulgaris |
| Sego Lily | Calochortus | nuttalii |
| Self-heal | Prunella | vulgaris |
| Semilla De Chintallahua | Rhynchosia | phaseoloides |
| Senega | Polygala | senega |
| Senegal Senna | Cassia | obovata |
| Senna | Cassia | |
| Senna | Cassia | acutifolia |
| Senorita | Bomarea | |
| Sensitive Plant | Mimosa | |
| Sensitive Plant | Mimosa | pudica |
| Serissa | Serissa | foetida |
| Serpent Melon | Cucumis | flexuosum |
| serviceberry | Amelanchier | alnifolia |
| Service-berry | Amelanchier | ovalis |
| Service-tree | Sorbus | domestica |
| Sesame | Sesamum | indicum |
| Sesame | Sesamum | orientale |
| Sesame | Sesamum | orientale: |
| Sessile Oak | Quercus | petraea |
| Sessile trillium | Trillium | chloropetalum |
| Seville Orange | Citrus | aurantium |
| Shadblow | Amelanchier | canadensis |
| Shasta Daisy | Chrysanthemum | x superbum |
| Shasta Daisy | Leucanthemum | x superbum |
| Sheep’s Fescue | Festuca | ovina |
| Sheep’s Laurel | Kalmia | angustifolia |
| Sheep’s Scabious | Jasione | montana |
| Sheep’s Sorrel | Rumex | acetosella |
| Shell Ginger | Alpinia | nutans |
| She-oak | Casuarina | |
| Shepherd’s Purse | Capsella | bursa-pastoris |
| Shining Orache | Atriplex | nitens |
| Shiningleaved Custard Ap | Annona | palustris |
| Shiny asparagus | Asparagus | lucidus |
| Shiso | Dentidia | nankinensis: |
| Shiso | Mentha | reticulosa: |
| Shiso | Perilla | arguta: |
| Shiso | Perilla | frutescens |
| Shiso | Perilla | ocymoides var. crispa: |
| Shiso | Perilla | ocymoides: |
| Shiso | Plectranthus | nankinensis: |
| Shoofly Plant | Nicandra | physaloides |
| Shooting Star | Dodecatheon | alpinum |
| Shootingstar | Dodecatheon | meadia |
| Shore blue-eyed-grass | Sisyrinchium | littorale |
| Shore pine | Pinus | contorta |
| Showy Betony | Stachys | grandiflora |
| Showy Blue Gilia | Gilia | leptantha subsp. purpusii |
| Showy Calamint | Calamintha | grandiflora |
| Showy Chickweed | Cerastium | grandiflorum |
| Showy Elecampane | Inula | magnifica |
| Showy Elecampane | Inula | racemosa |
| Showy Evening Primrose | Oenothera | speciosa |
| Showy Goldenrod | Solidago | speciosa |
| Showy Leopard’s Bane | Doronicum | cordatum |
| Showy Sunflower | Helianthus | x laetiflorus |
| Showy Tidytips | Layia | elegans |
| Shrimp Plant | Beloperone | guttata |
| Shrubby Beard Tongue | Penstemon | heterophyllus |
| shrubby cinquefoil | Potentilla | fruticosa |
| Shrubby Light-blue Beard- | Penstemon | serrulatus |
| Shrubby St. Johnswort | Hypericum | prolificum |
| Siam Cardamums | Amomum | globosum |
| Siberian Catnip | Dracocephalum | sibiricum |
| Siberian ginseng | Acanthopanax | senticosus |
| Siberian Ginseng | Eleutherococcus | senticosus |
| Siberian Iris | Iris | sibirica |
| Siberian Lupin | Thermopsis | lupinoides |
| Siberian Motherwort | Leonurus | sibericus |
| Siberian motherwort | Leonurus | sibiricus |
| Siberian Peashrub | Caragana | arborescens |
| Siberian Radish | Raphanus | sibiricus |
| Siberian Sow-thistle | Sonchus | tartaricus |
| Siberian Statice | Limonium | gmelinii |
| Siberian Wallflower | Erysimum | Allionii -hybr. |
| Siberian Yarrow | Achillea | sibirica |
| Sicilian Sumach | Rhus | coriaria |
| Sickle senna | Cassia | tora |
| Sickle-grass | Polygonum | arifoleum |
| Sideoats Grama | Bouteloua | curtipendula |
| Sidney Blue Gum | Eucalyptus | saligna |
| Siegesbeckia | Siegesbeckia | orientalis |
| Sikkim Cucumber | Cucumis | sativus var. sikkimensis |
| Silk Cotton Tree | Bombax | |
| Silk tree | Acacia | nemu: |
| Silk Tree | Albizia | julibrissin |
| Silk tree | Mimosa | arborea: |
| Silk-tassel | Garrya | elliptica |
| Silky Aster | Aster | sericeus |
| Silver Alyssum | Alyssum | murale |
| Silver beardgrass | Andropogon | saccharoides |
| Silver Birch | Betula | alba |
| Silver Dollar Eucalyptus | Eucalyptus | cinerea |
| Silver Dollar Eucalyptus | Eucalyptus | cinerea ‘Pendula’ |
| Silver Everlasting | Helichrysum | thianshanicum |
| Silver fir | Abies | |
| Silver Fir | Abies | forrestii |
| Silver Germander | Teucrium | fruticans |
| Silver Horehound | Marrubium | incanum |
| Silver King Wormwood | Artemisia | ludoviciana var. albula |
| Silver Licorice | Helichrysum | petiolare |
| Silver Malee Scrub | Eucalyptus | polybractea |
| Silver Milk Thistle | Silybum | eburneum |
| Silver Mint | Mentha | longifolia |
| Silver Mound | Artemisia | schmidtiana |
| Silver Mound Wormwood | Artemisia | schmidtiana ‘Nana’ |
| Silver Mullein | Verbascum | bombyciferum |
| Silver Plantain | Plantago | argentea |
| Silver Sage | Salvia | argentea |
| Silver Sagebrush | Artemisia | cana |
| Silver Speedwell | Veronica | incana |
| Silver Tansy | Tanacetum | niveum |
| Silver vine | Actinidia | polygama |
| Silver Wattle | Acacia | dealbata |
| Silver Wattle | Acacia | decurrens var. dealbata |
| Silver Yarrow | Achillea | clavennae |
| Silverbush | Sophora | tomentosa |
| Silverlace Dusty Miller | Chrysanthemum | ptarmiciflorum |
| Silverweed | Potentilla | anserina |
| Simaruba | Simaruba | amara |
| Simaruba | Simaruba | officinalis |
| Simaruba (Brazil) | Simaruba | versicolor |
| Sinuata Statice | Limonium | sinuatum |
| Sitka alder | Alnus | crispa subsp.sinuata |
| Sitka alder | Alnus | sinuata |
| Sitka alder | Alnus | sinuata: |
| Sitka alder | Alnus | sitchensis: |
| Sitka alder | Alnus | viridis ssp. sinuata: |
| Sitka mountain-ash | Sorbus | sitchensis |
| Sitka Spruce | Picea | sitchensis |
| Sitka Valerian | Valeriana | sitchensis |
| Sitka willow | Salix | sitchensis |
| Skeleton Weed | Eriogonum | deflexum |
| Skeleton-rose Geranium | Pelargonium | radens |
| Skirret | Sium | sisarum |
| Skunk Cabbage | Dracontium | foetidum |
| Skunk-cabbage | Symplocarpus | foetidus |
| Sky Blue Aster | Aster | azureus |
| Sky Blue Jacob’s Ladder | Polemonium | pulcherrimum |
| Slender bog-orchid | Platanthera | stricta |
| Slender Gerardia | Gerardia | tenuifolia |
| Slender Penstemon | Penstemon | gracilis |
| Slender-flowered Thistle | Carduus | pycnocephalous |
| Slender-leaved Elecampane | Inula | ensifolia |
| Slink lily | Scoliopus | hallii |
| Slippery Elm | Ulmus | fulva |
| Slippery Elm | Ulmus | rubra |
| Sloe | Prunus | spinosa |
| Small Bugloss | Lycopsis | arvensis |
| Small Feathergrass | Stipa | lepida |
| Small Teazle | Dipsacus | pilosus |
| Small twistedstalk | Streptopus | streptopoides |
| Smartweed | Polygonum | hydropiper |
| Smith’s fairybells | Disporum | smithii |
| Smoke Tree | Cotinus | americanus |
| Smooth Arizona Cypress | Cupressus | glabra |
| Smooth Aster | Aster | laevis |
| Smooth Dwarf Birch | Betula | nana |
| Smooth False Foxglove | Aureolaria | laevigata |
| Smooth Senna | Cassia | laevigata |
| Smooth Sumach | Rhus | glabra |
| Smooth Three-ribbed Golde | Solidago | gigantea |
| Smooth-leaved Foxglove | Digitalis | laevigata |
| Smyrna Origanum | Origanum | onitum |
| Smyrna Origanum Oil | Origanum | onitum var. smyrnaeum |
| Snake Gourd | Trichosanthes | anguina |
| Snake-barked Maple UK | Acer | pensylvanicum |
| Snakeroot | Aristolochia | serpentaria |
| Snakeshead Iris | Hermodactylus | tuberosa |
| Snapdragon | Antirrhinum | |
| Snapdragon | Antirrhinum | majus |
| Sneezeweed | Helenium | |
| Sneezeweed | Helenium | autumnale |
| Sneezewort Yarrow | Achillea | ptarmica |
| Snow bramble | Rubus | nivalis |
| Snow In Summer | Cerastium | tomentosum |
| Snowberry | Symphoricarpos | racemosus |
| Snowbrush | Ceanothus | velutinus |
| Snowdrop | Galanthus | ikariae |
| Snowdrop | Galanthus | nivalis |
| Snowdrop | Galanthus | plicatus |
| Snowflake Geranium | Pelargonium | capitatum ‘Snowflake’ |
| Snow-in-summer | Arabis | caucasica |
| Soap Tree | Quillaria | saponaria |
| Soaptree | Yucca | elata |
| Soapwort | Saponaria | |
| Soapwort | Saponaria | officinalis |
| Society Garlic | Tulbaghia | violacea |
| Soft-leaved sandbar willo | Salix | sessilifolia |
| Solomon’s Seal | Polygonatum | |
| Solomon’s Seal | Polygonatum | commutatum |
| Solomon’s Seal | Polygonatum | multiflorum |
| Solomon’s seal | Polygonatum | officinale |
| Soopolallie | Shepherdia | canadensis |
| Sorghum | Sorghum | |
| Sorrel Geranium | Pelargonium | acetosum |
| Sour Cherry | Prunus | cerasus |
| Sourwood | Oxydendron | arboreum |
| Sourwood | Oxydendrum | arboreum |
| South Africa Coral Tree | Erythrina | lysistemon |
| Southern Magnolia | Magnolia | grandiflora |
| Southernwood | Artemisia | abrotanum |
| Southernwood Geranium | Pelargonium | abrotanifolium |
| Soybean | Glycine | max |
| Spanish Bayonet | Yucca | aloifolia |
| Spanish Bayonet | Yucca | glauca |
| Spanish Bayonet | Yucca | whipplei |
| Spanish Bluebell | Endymion | hispanicus |
| Spanish Broom | Cytisus | multiflorus |
| Spanish Broom | Spartium | junceum |
| Spanish Clover | Desmodium | incanum |
| Spanish Foxglove | Digitalis | parviflora |
| Spanish Gorse | Genista | hispanica |
| Spanish Grey Lavender | Lavandula | dentata candicans |
| Spanish Heath | Erica | australis |
| Spanish Iris | Iris | xiphium |
| Spanish Jasmine | Jasminum | grandiflorum |
| Spanish Lavender | Lavandula | dentata |
| Spanish Needles | Bidens | bipinnata |
| Spanish Needles | Bidens | pinnata |
| Spanish Sage | Salvia | lavandulifolia |
| Spanish Sage Oil | Salvia | triloba |
| Spanish Wood Marjoram | Thymus | mastichina |
| Spear Thistle | Carduus | lanceolatus |
| Spear-leaved Orach | Atriplex | hastata |
| Spearmint | Mentha | spicata |
| sphagnum moss | Sphagnum | |
| Sphagnum Moss | Sphagnum | cymbifolium |
| Spider Flower | Cleome | |
| Spider Flower | Cleome | hasslerana |
| Spider Flower | Cleome | spinosa |
| Spider Flower | Grevillea | |
| Spider Plant | Chlorophytum | comosum |
| Spiderwort | Tradescantia | ohiensis |
| Spignel | Meum | athamanticum |
| Spike Lavender | Lavandula | latifolia |
| Spike Lavender | Lavandula | officinalis var. spica |
| Spiked Ornithogalum | Ornithogalum | pyrenaicum |
| Spiked Rampion | Phyteuma | spicatum |
| Spiked Speedwell | Veronica | spicata |
| Spiked Thyme | Thymbra | spicata |
| Spiked Water Milfoil | Myriophyllum | spicatum |
| Spinach | Spinaca | oleracea |
| Spindle Tree | Euonymus | atropurpureus |
| Spindle Tree | Euonymus | europaeus |
| Spindle Tree | Euonymus | latifolius |
| Spindle Tree | Euonymus | sachalinensis |
| Spindle Tree | Euonymus | yedoensis |
| Spineless Teasel | Dipsacus | inermis |
| Spiny Bear’s Breech | Acanthus | spinosus var. spinosissimus |
| Spiral Flag | Costus | |
| Spiral Ginger | Costus | speciosus |
| Spirea | Spiraea | x vanhouttei |
| Spleenwort | Asplenium | bulbiferum |
| Spotted coralroot | Corallorrhiza | maculata |
| Spotted Cranesbill | Geranium | maculatum |
| Spotted Dead-nettle | Lamium | maculatum |
| Spotted Jewelweed | Impatiens | capensis |
| Spotted Orchis | Orchis | maculata |
| Spotted Spurge | Euphorbia | maculata |
| Spotted Wintergreen | Chimaphila | maculata |
| Spreading Euonymus | Euonymus | kiautschovicus |
| Spring Anemone | Pulsatilla | vernalis |
| Spring Gentian | Gentiana | verna |
| Spring Gold | Lomatium | utriculatum |
| Spurge | Euphorbia | aleppica |
| Spurge | Euphorbia | amydaloides |
| Spurge | Euphorbia | antiguorum |
| Spurge | Euphorbia | apois |
| Spurge | Euphorbia | balsamifera |
| Spurge | Euphorbia | buxifolia |
| Spurge | Euphorbia | canariensis |
| Spurge | Euphorbia | canescens |
| Spurge | Euphorbia | cotinifolia |
| Spurge | Euphorbia | cremocarpus |
| Spurge | Euphorbia | cyparissias |
| Spurge | Euphorbia | dendroides |
| Spurge | Euphorbia | drummondii |
| Spurge | Euphorbia | gerardiane |
| Spurge | Euphorbia | griffithii |
| Spurge | Euphorbia | heterodoxa |
| Spurge | Euphorbia | hiberna |
| Spurge | Euphorbia | hirta |
| Spurge | Euphorbia | humistrata |
| Spurge | Euphorbia | hypericifolia |
| Spurge | Euphorbia | iata |
| Spurge | Euphorbia | laurifolia |
| Spurge | Euphorbia | ligularia |
| Spurge | Euphorbia | linearis |
| Spurge | Euphorbia | mauritanica |
| Spurge | Euphorbia | myrsinites |
| Spurge | Euphorbia | papillosa |
| Spurge | Euphorbia | parviflora |
| Spurge | Euphorbia | peplis |
| Spurge | Euphorbia | peploides |
| Spurge | Euphorbia | peplus |
| Spurge | Euphorbia | pilosa |
| Spurge | Euphorbia | platyphylla |
| Spurge | Euphorbia | portulacoides |
| Spurge | Euphorbia | prostata |
| Spurge | Euphorbia | robbiae |
| Spurge | Euphorbia | spinosa |
| Spurge | Euphorbia | tetragona |
| Spurge | Euphorbia | thymifolia |
| Spurge | Euphorbia | tirucalli |
| Spurge | Euphorbia | tribuloides |
| Spurge Flax | Daphne | gnidium |
| Spurge Laurel | Daphne | laureola |
| Spurge Laurels | Daphne | |
| Spurges | Euphorbia | |
| Spurred Butterfly Pea | Centrosema | virginiana |
| Squashberry | Viburnum | edule |
| Squaw Vine | Mitchella | repens |
| Squill | Urginea | scilla |
| Squirrel Tail-grass | Hordeum | jubatum |
| Squirting Cucumber | Ecballium | elaterium |
| St Bernard’s Lily | Anthericum | liliago |
| St John’s Chamomile | Anthemis | sancti-johannis |
| St Lucie Cherry | Prunus | mahaleb |
| St. John’s Wort | Hypericum | perforatum |
| Staghorn Oak Geranium | Pelargonium | quercifolium |
| Staghorn Sumach | Rhus | typhina |
| Standing Cypress | Gilia | rubra |
| Standing Morning Glory | Ipomoea | fistulosa |
| Star Anise | Illicium | anisatum |
| Star Anise | Illicium | verum |
| Star Apple | Chrysophyllum | cainito |
| Star jasmine | Echites | saligna: |
| Star jasmine | Nerium | divaricatum: |
| Star jasmine | Parechites | adnascens: |
| Star jasmine | Parechites | thunbergii: |
| Star jasmine | Trachelospermum | divaricatum: |
| Star jasmine | Trachelospermum | jasminoides |
| Star Magnolia | Magnolia | stellata |
| Star of Bethlehem | Ornithogalum | umbellatum |
| Star of The Veldt | Dimorphotheca | aurantiaca |
| Star-flowered false Solom | Smilacina | stellata |
| Statice | Limonium | |
| Statice | Limonium | aureum |
| Stavesacre | Delphinium | staphisagria |
| Stemless Gentian | Gentiana | acaulis var. angustifolia |
| Steven’s spirea | Spiraea | bauverdiana: |
| Steven’s spirea | Spiraea | stevenii |
| Stevia | Stevia | rebaudiana |
| Sticky currant | Ribes | viscosissimum |
| Sticky false asphodel | Tofieldia | glutinosa |
| Stiff Coreopsis | Coreopsis | palmata |
| Stinking Chamomile | Anthemis | cotula |
| Stinky currant | Ribes | bracteosum |
| Stitchwort | Stellaria | |
| Stocks | Matthiola | |
| Stone Root | Collinsonia | canadensis |
| Stonecrop | Sedum | |
| Stoneroot | Collinsia | canadensis |
| Storax | Liquidambar | orientalis |
| Storax | Styrax | officinale |
| Straw Foxglove | Digitalis | lutea |
| Strawberry | Fragaria | |
| Strawberry | Fragaria | virginiana |
| Strawberry Blite | Chenopodium | capitatum |
| Strawberry Foxglove | Digitalis | x mertonensis |
| Strawberry Geranium | Pelargonium | x scarboroviae |
| Strawberry Guava | Psidium | cattleianum |
| Strawberry Tree | Arbutus | andrachne |
| Strawberry Tree | Arbutus | x andrachnoides |
| Straw-coloured Turk’s Cap | Lilium | pyrenaicum |
| Strawflower | Helichrysum | bracteatum |
| Strawflower | Helichrysum | bracteatum ‘Monstrosum’ |
| Striped coralroot | Corallorrhiza | striata |
| Strophantus | Strophanthus | gratus |
| Strophantus | Strophanthus | hispidus |
| Strophantus | Strophanthus | kombé |
| Strophantus | Strophanthus | nicholsoni |
| Strychnine tree | Strychnos | nux-vomica |
| Styrian Pumpkin | Cucurbita | pepo var. styriaca |
| Subalpine mariposa lily | Calochortus | subalpinus |
| Subalpine spirea | Spiraea | densiflora |
| Sugar Beet | Beta | vulgaris var. altissima |
| Sugar Maple | Acer | saccharum |
| Sugar Pea | Pisum | sativum var. macrocarpon |
| Sugar pine | Pinus | lambertiana |
| Sulphur Flower | Eriogonum | umbellatum |
| Sumacs | Rhus | |
| Sumbul | Ferula | sumbul |
| Summer Purslane | Portulaca | oleracea subsp. sativa |
| Summer Savory | Satureja | hortensis |
| Sun Glory | Heliopsis | |
| Sun Spurge | Euphorbia | helioscopia |
| Sunberry | Solanum | melanocerasum |
| sundew | Drosera | |
| Sundew | Drosera | rotundifolia |
| Sundrops | Oenothera | perennis |
| Sunflower | Helianthus | |
| Sunflower | Helianthus | annuus |
| Sunn Hemp | Crotalaria | juncea |
| Superb Pink | Dianthus | superbus |
| Surinam Quassia | Quassia | amara |
| Suwarron | Cereus | giganteus |
| Suyo Long Cucumber | Cucumis | sativus ‘Suyo Long’ |
| Swainson’s Pea | Swainsonia | galegifolius |
| Swallow-wort | Asclepias | vincetoxicum |
| swamp cabbage | Lysichiton | americanum |
| Swamp Cottonwood | Populus | heterophylla |
| Swamp Laurel | Kalmia | glauca |
| Swamp Lilies | Lilium | pardalinum |
| Swamp Milkweed | Asclepias | incarnata |
| Swamp Sumach | Rhus | verni |
| Swamp Willow-herb | Lythrum | verticillatum |
| Swan River Agar-Agar | Gigartina | speciosa |
| Swan River Daisy | Brachycome | iberidifolia |
| Sweet Almond | Prunus | dulcis |
| Sweet Alyssum | Lobularia | maritima |
| Sweet Annie | Artemisia | annua |
| Sweet Autumn Clematis | Clematis | paniculata |
| Sweet Basil | Ocimum | basilicum |
| Sweet Black-eyed Susan | Rudbeckia | subtomentosa |
| Sweet Boronia | Boronia | megastigma |
| Sweet Box | Bursaria | spinosa |
| Sweet Briar Rose | Rosa | rubiginosa |
| Sweet Broom | Hedysarum | |
| Sweet Chestnut | Castanea | sativa |
| Sweet Cicely | Myrrhis | odorata |
| Sweet Cow Parsnip | Heracleum | dulce |
| Sweet Feverfew | Chrysanthemum | suaveolens |
| Sweet Gale | Myrica | gale |
| Sweet Gum | Liquidambar | |
| Sweet Gum | Liquidambar | styraciflua |
| Sweet Herb | Eupatorium | rebaudiana |
| Sweet Horsemint | Cunila | origanoides |
| Sweet Lavender | Lavandula | heterophylla |
| Sweet Lemon | Citrus | lumia |
| Sweet Marjoram | Majorana | hortensis |
| Sweet Marjoram | Origanum | majorana |
| Sweet Oar-Weed | Laminaria | saccharina |
| Sweet Orange | Citrus | aurantium var. dulcis |
| Sweet Pea | Lathyrus | odoratus |
| Sweet Pepper Bush | Clethra | alnifolia |
| Sweet Potato | Ipomoea | batatas |
| Sweet Sedge | Acorus | calamus |
| Sweet Segde | Calamus | rotang |
| Sweet Shrub | Calycanthus | |
| Sweet Sultan | Amberboa | moschata |
| Sweet Sultan | Centaurea | moschata |
| Sweet Sumach | Rhus | aromatica |
| Sweet Violet | Viola | odorata |
| Sweet William | Dianthus | barbatus |
| Sweet Winter Wattle | Acacia | suaveolens |
| Sweet Woodruff | Galium | odoratum |
| Sweet Yarrow | Achillea | ageratum |
| Sweet-scented Goldenrod | Solidago | odora |
| Sweetscented Vernal Grass | Anthoxanthum | odoratum |
| Sweet-scented Virgin’s B | Clematis | flammula |
| Sweet-thorn | Acacia | karroo |
| Swine’s Chicory | Arnoseris | pusilla |
| Swiss Stone Pine | Pinus | cembra |
| Swiss Wormwood | Artemisia | vallesiaca |
| Switchgrass | Panicum | virgatum |
| Sycamore Fig | Ficus | sycamorus |
| Sydney Golden Wattle | Acacia | longifolia |
| Syrian Bindweed | Convolvulus | scammonia |
| Syrian of | Majorana | syriaca |
| Syrian Rue | Peganum | harmala |