Common names: S
- sabal palm
- sack-carrying orchid
- sacred Bali bamboo
- sacred bamboo
- sacred blue lotus
- sacred-flower-of-the-Incas
- safflower
- sage
- sage-leaved rock rose
- sago palm
- sainfoin
- Saint John's rosemallow
- Sakhalin knotweed
- salad
- salsify
- Samoan gardenia
- sand cherry
- sand iris
- sand phlox
- sand pink
- sand willow
- sandbox tree
- sanddune wallflower
- sandpaper vine
- sanicle
- Santa Cruz water lily
- Sargent crab apple
- Sargent's cherry
- Sargent's hydrangea
- Saskatoon service berry
- satin flower
- satin poppy
- sausage tree
- Savin juniper
- savory
- savoy cabbage
- saw-tooth banksia
- saw-toothed azara
- Sawara cypress
- sawtooth stewartia
- saxifrage
- scabious
- scabwort
- scalloped-leaf speedwell
- scaly blazing star
- scarlet bee balm
- scarlet bottlebrush
- scarlet creeper
- scarlet firethorn
- scarlet gilia
- scarlet lobelia
- scarlet martagon lily
- scarlet milkweed
- scarlet morning glory
- scarlet oak
- scarlet peony
- scarlet pimpernel
- scarlet runner
- scarlet sage
- scarlet silkweed
- scarlet skullcap
- scarlet sumach
- scented pelargonium
- scentless feverfew
- Schmidt's mugwort
- Schott's houseleek
- Schott's yucca
- Schreber's aster
- Schumann's abelia
- scorpion senna
- scorpion vetch
- Scotch crocus
- Scots pine
- scouring rush
- screw pine
- screwpine
- scribbly gum
- scrub beefwood
- scrub cherry
- sea buckthorn
- sea campion
- sea daffodil
- sea hibiscus
- sea holly
- sea kale
- sea lavender
- sea lettuce
- sea milkwort
- sea sandwort
- sea squill
- sea urchin cactus
- seakale
- sealing wax palm
- seashore false bindweed
- seaside daisy
- sedge
- Seguier's spurge
- semi-cactus dahlia
- sempervirens rose
- senna
- sensitive fern
- sensitive plant
- Sequier's pink
- sequoia
- Serbian bellflower
- Serbian spruce
- serengan
- service berry
- service tree
- service tree of Fontainbleau
- serviceberry
- sessile oak
- seven sons flower
- shadbush
- shagbark hickory
- shallot
- sharp-toothed whitebeam
- sheep laurel
- sheepberry
- shell ginger
- shield fern
- shield nasturtium
- shieldleaf
- shining rose
- shiny cone flower
- Shirasawa's maple
- short-toothed mountain mint
- shower orchid
- showy banksia
- showy goldeneye
- showy lady's slipper orchid
- showy milkweed
- showy mullein
- showy stonecrop
- showy swertia
- showy toothwort
- shrimp plant
- shrub aster
- shrub balsam
- shrub oak
- shrub rose
- shrubby bindweed
- shrubby cinquefoil
- shrubby milkwort
- shrubby simpoh
- shrubby tororaro
- shrubby veronica
- shuttlecock fern
- Shuttleworth's bulrush
- Shuttleworth's cattail
- Siam tulip
- Siberian alpenrose
- Siberian bugloss
- Siberian catmint
- Siberian corydalis
- Siberian crab apple
- Siberian cypress
- Siberian ginseng
- Siberian iris
- Siberian lily
- Siberian motherwort
- Siberian peashrub
- Siberian spring beauty
- Siberian squill
- Siberian stinging nettle
- Siberian wallflower
- Sibirian speedwell
- Sichuan pepper
- Sicilian honey garlic
- Sicilian honey lily
- sidebells penstemon
- Siebold's magnolia
- Siebold's spindle tree
- Siebold's viburnum
- signet marigold
- Sikkim allium
- Sikkim spruce
- silk cotton tree
- silk floss tree
- silk tassel
- silk tree
- silk vine
- silkweed
- silky hakea
- silky spike melic
- silver banksia
- silver birch
- silver bush
- silver bush everlasting
- silver clary
- silver date palm
- silver dollar cactus
- silver dollar plant
- silver dollar tree
- silver grass
- silver groundsel
- silver lace tansy
- silver lace vine
- silver leafed princess flower
- silver lime
- silver maple
- silver mullein
- silver princess gum
- silver ragwort
- silver sage
- silver senna
- silver vine
- silverbell
- silverberry
- silvery bindweed
- silvery lupin
- Singapore rhododendron
- single dahlia
- single early tulip
- single late tulip
- singleleaf ash
- Sitka spruce
- six-rowed barley
- skirret
- skullcap
- skunk cabbage
- skyflower
- slender blue beard tongue
- slender broom
- slender deutzia
- slender penstemon
- slender St. John's wort
- slipper flower
- slipperwort
- sloe
- small balsam
- small Jack-in-the-pulpit
- small-flowered black hawthorn
- small-flowered foxglove
- small-flowered rock rose
- small-leaved broom
- small-leaved cotoneaster
- small-leaved globe mallow
- small-leaved hawthorn
- small-leaved lime
- small-leaved mock orange
- smaller periwinkle
- smearwort
- Smirnow's rhododendron
- smoke tree
- smoketree
- smooth aster
- smooth azalea
- smooth darling pea
- smooth hydrangea
- smooth Solomon's seal
- snail bean
- snake gourd
- snake plant
- snake vine
- snake's head
- snake's head fritillary
- snakebark maple
- snakeroot
- snapdragon
- sneezeweed
- snow azalea
- snow on the mountain
- snow-in-summer
- snowberry
- snowdrop
- snowdrop anemone
- snowdrop bush
- snowdrop onion
- snowdrop tree
- snowflake
- snowy mespilus
- soap aloe
- soap bark tree
- soapwort
- society garlic
- soft shield fern
- solitary clematis
- Solomon's seal
- song of India
- sorrel
- sorrel-leaved pelargonium
- soulieana rose
- sour cherry
- sour dock
- South African pelargonium
- southern arrowwood
- southern ball flower
- southern catalpa
- southern magnolia
- southern marsh orchid
- southern meadow sage
- southern spurge
- southern wormwood
- sow thistle
- soya bean
- soybean
- spaghetti squash
- Spanish bluebell
- Spanish broom
- Spanish fir
- Spanish flag
- Spanish foxglove
- Spanish lavender
- Spanish oyster thistle
- Spanish sage
- Spanish shawl
- spear lily
- spearmint
- speckled alder
- speedwell
- spelt
- spicy jatropha
- spider flower
- spider lily
- spider plant
- spider-net grevillea
- spiderwort
- spike lavender
- spike winter hazel
- spiked speedwell
- spikenard
- spinach
- spinach dock
- spindle tree
- spiniest thistle
- spinossima rose
- spiny bear's breeches
- spiny broom
- spiny restharrow
- spiral ginger
- spoon-leaved sundew
- spoonleaf yucca
- spotted bee balm
- spotted bellflower
- spotted cinquefoil
- spotted dead nettle
- spotted henbit
- spotted Joe-Pye weed
- spotted laurel
- spotted orchid
- spotted snapweed
- sprawling speedwell
- spreading cotoneaster
- spreading gooseberry
- spreading rock cress
- Sprenger's magnolia
- spring adonis
- spring anemone
- spring beauty
- spring cinquefoil
- spring crocus
- spring gentian
- spring meadow saffron
- spring onion
- spring pasque flower
- spring pea
- spring snowflake
- spring starflower
- spring vetchling
- spruce
- spurflower
- spurge
- spurge laurel
- spurred anoda
- square stemmed monkey flower
- squash
- squaw currant
- squill
- squirting cucumber
- St. Benedict's thistle
- St. Bernhard's lily
- St. John's wort
- St. Patrick's cabbage
- St. Vincent rock rose
- stag's horn sumach
- staghorn fern
- standing cypress
- star anise
- star grass
- star jasmine
- star magnolia
- star of Persia
- star squill
- Star-of-Bethlehem
- starflower
- starfruit
- stavesacre
- stemless carline thistle
- stemless daisy
- stemless gentian
- Sternberg's pink
- sticky catchfly
- sticky nightshade
- sticky phacelia
- sticky sage
- stiff bottlebrush
- stiff sunflower
- stiffleaf cheesewood
- stinging nettle
- stinking gum
- stinking hellebore
- stinking iris
- stinking St. John's wort
- stitchwort
- Stokes aster
- stone cress
- stonecress
- stonecrop
- stoneseed
- storksbill
- stranvaesia
- straw foxglove
- strawberry
- strawberry mint
- strawberry tomato
- strawberry tree
- streamside fleabane
- striped maple
- Stryrian pasque flower
- stuffing gourd
- Styrian oil pumpkin
- subalpine fir
- succulent sesame
- Suffolk lungwort
- sugar cane
- sugar leaf
- sugar maple
- sugarbush
- sulphur alder
- sulphur cinquefoil
- sulphur cosmos
- sulphur polypore
- sulphur shelf
- sumach
- summer cypress
- summer hyacinth
- summer lilac
- summer ragwort
- summer snowflake
- summer squash
- sun rose
- sundew
- sundial lupin
- sunflower
- sunn hemp
- sunset foxglove
- swallowwort
- swamp banksia
- swamp bottlebrush
- swamp cypress
- swamp hickory
- swamp loosestrife
- swamp milkweed
- swamp paperbark
- swamp pink
- swamp rosemallow
- swamp silkweed
- swan's neck
- swede
- Swedish ivy
- Swedish service tree
- sweet alyssum
- sweet autumn clematis
- sweet bay
- sweet Betsy
- sweet birch
- sweet box
- sweet briar
- sweet chestnut
- sweet cicely
- sweet clover
- sweet crab apple
- sweet fennel
- sweet flag
- sweet granadilla
- sweet gum
- sweet Indian plantain
- sweet Joe-Pye weed
- sweet leaf of Paraguay
- sweet lemon mint
- sweet mock orange
- sweet osmanthus
- sweet pea
- sweet pepper
- sweet pepper bush
- sweet pepperbush
- sweet potato
- sweet rocket
- sweet scented Indian plantain
- sweet thorn
- sweet viburnum
- sweet violet
- sweet William
- sweet William catchfly
- sweet willow
- sweet yarrow
- sweetgum
- sweetshrub
- sweetspire
- Sweginzow's rose
- swiss chard
- Swiss cheese plant
- Swiss dandelion
- Swiss pine
- Swiss willow
- switch grass
- sycamore maple
- Sydney red gum
- Syrian marjoram
- Syrian oregano
- Syrian thistle