Plants — S
- Saccharina angustata
- Saccharina latissima Common Southern Kelp
- Saccharum Sugarcane
- Sagittaria trifolia
- Salacia chinensis
- Salacia reticulata Kothala himbutu
- Salacia verrucosa
- Salix Willow
- Salix alba Cricket-Bat Willow
- Salix babylonica Babylon Weeping Willow
- Salix caprea Goat Willow
- Salix nigra Black Willow
- Salix tetrasperma Indian willow
- Salvadora persica Tooth-Bush Tree
- Salvia Claries
- Salvia albocaerulea
- Salvia aurea Brown Sage
- Salvia hispanica
- Salvia mellifera Californian Black Sage
- Salvia microphylla Baby Sage
- Salvia miltiorrhiza Astral Sage
- Salvia officinalis sage
- Salvia pratensis Introduced sage
- Salvia rosmarinus Rosemary
- Salvia sclarea Clary
- Salvia splendens Scarlet sage
- Salvia subg. Rosmarinus Rosmarinus
- Salvia subg. Zhumeria
- Salvia yangii Russian Sage
- Sambucus Elder
- Sambucus canadensis American Black Elderberry
- Sambucus ebulus Danewort
- Sambucus javanica Chinese elder
- Sambucus nigra Black Elder
- Sambucus racemosa American red elderberry
- Sambucus williamsii Korean Elder
- Sandoricum koetjape Santol
- Sanguinaria Bloodroot
- Sanguinaria canadensis Bloodroot
- Sanguisorba officinalis Burnet Bloodwort
- Sanicula europaea European sanicle
- Sanicula orthacantha
- Sansevieria
- Sansevieria stuckyi
- Sansevieria trifasciata African bowstring-hemp
- Santalum album East Indian Sandalwood
- Santalum lanceolatum
- Sapindus mukorossi Chinese soapberry
- Sapindus rarak
- Saponaria officinalis Bladder Soapwort
- Saposhnikovia divaricata Siler
- Sarcandra glabra Glabrous Sarcandra Herb
- Sarcopoterium Spiny Burnet
- Sarcostemma viminale
- Sarracenia American pitcher plants
- Sarracenia purpurea Common Pitcherplant
- Saruma henryi Upright Wild Ginger
- Sassafras
- Sassafras albidum Mitten tree
- Sassafras tzumu Chinese Sassafras
- Satureja Savory
- Satureja montana Savory
- Satureja thymbra Thyme-leaved Savory
- Saurauia elegans
- Sauropus spatulifolius
- Saururus cernuus Lizard's Tail
- Saussurea Saw-Wort
- Saussurea costus costus
- Saussurea involucrata
- Saussurea japonica East Asian saussurea
- Saussurea obvallata
- Saussurea pulchella Maiden saussurea
- Saxifraga granulata
- Scaevola taccada Beach Naupaca
- Scandix pecten-veneris
- Schima superba Chinese Gugertree
- Schima wallichii
- Schinus molle American pepper
- Schisandra Magnolia Vine
- Schisandra chinensis
- Schisandra sphenanthera lemonwood
- Schizonepeta tenuifolia
- Schoenocaulon officinale
- Scilla Squill
- Scleria sumatrensis Sumatran scleria
- Sclerocarya birrea Morula
- Scleromitrion diffusum spreading diamond flower
- Scoparia dulcis Licorice Weed
- Scorzonera hispanica
- Scorzonera humilis
- Scrophularia Figwort
- Scrophularia buergeriana Buerger’s figwort
- Scrophularia ningpoensis Chinese figwort
- Scrophularia nodosa Common Figwort
- Scutellaria Huachuca Skullcap
- Scutellaria baicalensis Baikal skullcap
- Scutellaria galericulata Common Skullcap
- Scutellaria indica Indian skullcap
- Scutellaria lateriflora Blue Skullcap
- Scutellaria nana Ravendale skullcap
- Securinega Bushweeds
- Sedum
- Sedum acre Biting Stonecrop
- Sedum dendroideum Greater Mexican-stonecrop
- Sedum lineare Needle stonecrop
- Sedum spathulifolium Colerado Stonecrop
- Selaginella bryopteris
- Selaginella lepidophylla dinosaur plant
- Selaginella tamariscina Little club-moss
- Semecarpus anacardium
- Sempervivum tectorum Common Houseleek
- Senegalia catechu Black cutch
- Senegalia mellifera
- Senegalia polyacantha subsp. campylacantha Falcon's Claw Acacia
- Senega officinalis Seneca root
- Senna Senna (plant)
- Senna alata Candelabra Bush
- Senna alexandrina Alexandrian senna
- Senna auriculata Matara-tea
- Senna obtusifolia American Sicklepod
- Senna occidentalis Birds Beak
- Senna siamea Iron Wood
- Senna tora Foetid Cassia
- Serenoa repens Saw Palmetto
- Seriphidium balchanorum
- Sesamum indicum Beniseed
- Sesbania grandiflora Vegetable hummingbird
- Seseli libanotis
- Sesuvium portulacastrum
- Shepherdia argentea buffalo shepherdia
- Shirakiopsis indica
- Shorea roxburghii White Meranti
- Sicyos edulis Chayote
- Sideritis calduchii
- Sideroxylon inerme white milkwood
- Silene firma Catchfly
- Silene repens pink campion
- Silphium Rosinweed
- Silybum Milkthistle
- Silybum marianum milk thistle
- Sinapis alba White mustard
- Sindora siamensis
- Sinomenium acutum Orientvine
- Siphonodon celastrineus
- Siphonostegia chinensis Asian siphonostegia
- Siraitia grosvenorii Buddhafruit
- Sisymbrium officinale Crambling Mustard
- Sisyrinchium bellum western blue-eyed grass
- Smilax aristolochiifolia Mexican sarsaparilla
- Smilax china China root
- Smilax glabra Chinese smilax
- Smilax moranensis
- Smilax ornata
- Smilax sieboldii Siebold’s greenbrier
- Smirnowia
- Smyrnium olusatrum Alexanders
- Soda rosmarinus
- Solanum Apples of Sodom
- Solanum aculeastrum Apple of Sodom
- Solanum americanum American Black
- Solanum aviculare New Zealand Nightshade
- Solanum campylacanthum
- Solanum carolinense Apple Of Sodom
- Solanum donianum Mullein nightshade
- Solanum erianthum
- Solanum laciniatum Kangaroo-Apple
- Solanum lyratum
- Solanum mammosum Nipple fruit
- Solanum nigrum
- Solanum paniculatum
- Solanum pseudocapsicum False Jerusalem Cherry
- Solanum torvum Devil's-fig
- Solanum trilobatum
- Solanum violaceum
- Solanum virginianum Surattense nightshade
- Solenostemma argel Solenostemma arghel
- Solidago virgaurea European Goldenrod
- Sonchus arvensis
- Sonchus brachyotus Seashore sowthistle
- Sonchus oleraceus Annual Sow Thistle
- Sophora alopecuroides
- Sophora exigua
- Sophora flavescens Shrubby sophora
- Sophora pachycarpa
- Sparganium stoloniferum Simple-stem Bur-reed
- Spartium junceum
- Spathodea campanulata African Flame Tree
- Spenceria
- Sphaeralcea incana gray globemallow
- Sphaeranthus indicus
- Sphagnum capillifolium
- Spiraea salicifolia Bridal-spray
- Spiraea splendens Mountain Spiraea
- Spiranthes sinensis Chinese Spiranthes
- Spirodela polyrhiza Common Duckmeat
- Spondias mombin Hogplum
- Spondias pinnata amberella
- Spondias purpurea Purple Mombin
- Stachys affinis Artichoke Betony
- Stachys oblongifolia
- Stachys palustris Hedge-nettle
- Stachys riederi var. japonica Hairless woundwort
- Stachytarpheta cayennensis
- Stachytarpheta jamaicensis Brazilian-tea
- Stanleya pinnata Desert Prince's Plume
- Staphisagria
- Staphisagria macrosperma Licebane
- Stellaria dichotoma
- Stellaria media Chickweed
- Stellera
- Stemona
- Stemona collinsiae
- Stenochlaena palustris Climbing Swamp fern
- Stephania
- Stephania crebra
- Stephania erecta
- Stephania pierrei
- Stephania tetrandra stephania-root
- Stephania tomentella
- Stephania venosa
- Stevia Stevia (genus)
- Stevia rebaudiana candyleaf
- Streblus asper
- Streptosolen
- Strobilanthes cusia Assam-indigo
- Strombus Conch
- Strophanthus kombe Kombe Poisonrope
- Struthiopteris spicant Deer Fern
- Strychnos nux-blanda
- Strychnos nux-vomica nux-vomica
- Styphnolobium
- Styphnolobium japonicum Chinese Scholar Tree
- Styrax Snowbells
- Suaeda glauca Asian common seepweed
- Suaeda maritima Annual Sea-Blite
- Swertia Felwort
- Swertia leducii
- Swietenia macrophylla Big Leaf Mahogany
- Symphyotrichum puniceum Bog Aster
- Symphytum Comfrey
- Symphytum asperum
- Symphytum officinale Boneset
- Symplocarpus foetidus Polecatweed
- Symplocos Sweetleaf
- Symplocos paniculata Asiatic sweetleaf
- Syngonium podophyllum
- Synsepalum dulcificum Miraculous Berry
- Syringa Chinese lilac
- Syringa reticulata subsp. amurensis Amur Lilac
- Syringa vulgaris Common Lilac
- Syzygium aromaticum clove
- Syzygium cumini Black Plum
- Syzygium jambos Jambos
- Syzygium samarangense Java-apple