| S |
| Sabal minor, Dwarf palmetto; Swamp palmetto |
| Sabal palmetto, Cabbage palm |
| Sabatia angularis, Sabatia; Rose-pink |
| Saccharum ravennae, Ravenna grass |
| Sagittaria lancifolia, Lanceleaved arrowhead |
| Sagittaria latifolia, Duck potato |
| Sagittatia fasciculata, Duck potato |
| Salix alba var. sericea, White willow |
| Salix babylonica, Weeping willow |
| Salix caprea, European pussy willow; Goat willow |
| Salix caprea, Pussy-willow |
| Salix caroliniana, Swamp willow |
| Salix chaenomeloides, Japanese pussy willow |
| Salix discolor, Pussy willow |
| Salix integra 'Hakuro-nishiki', Nishiki willow; Japanese dappled willow |
| Salix matsudana 'Scarlet Curles', Hankow willow; Pekin willow |
| Salix matsudana var. tortuosa, Corkscrew willow |
| Salix nigra, Black willow |
| Salix purpurea, Basket willow; Purpleosier |
| Salix sachhalinensis 'Sekka' = Salix udensis 'Sekka', Japanese fantail willow |
| Salpiglossis sinuata, Painted tongue |
| Salvia argentea, Silver sage |
| Salvia coccinea, Bloody sage; Texas sage |
| Salvia elegans, Pineapple sage |
| Salvia farinacea, Mealy-cup sage |
| Salvia leucantha, Velvet sage |
| Salvia lyrata, Lyre-leaved sage |
| Salvia officinalis, Sage |
| Salvia sclarea, Clary sage |
| Salvia splendens, Salvia; Scarlet sage |
| Salvia uliginosa, Sky-blue sage |
| Salvia x superba, Hybrid sage |
| Sambucus canadensis, American elderberry |
| Sambucus canadensis, American elderberry |
| Sambucus nigra, European elderberry |
| Sambucus pubens, Red elderberry; Scarlet elder |
| Sambucus pubens, Red elderberry; Scarlet elderberry |
| Sandersonia aurantiaca, Christmas bells; Chinese-lantern lily |
| Sanguinaria canadensis, Bloodroot |
| Sanguisorba canadensis, Canada burnet |
| Santolina chamaecyparissus, Lavender cotton; Santolina |
| Santolina chamaecyparissus, Lavender cotton; Santolina |
| Santolina piñata, Green santolina |
| Santolina virens, Green santolina |
| Santolina virens, Green santolina |
| Saponaria ocymoides, Rock soapwort |
| Saponaria officinalis, Bouncing-bet; Soapwort |
| Sarcococca confusa, Sarococca |
| Sarcococca hookeriana var. humilis, Sarcococca; Sweetbox |
| Sarcococca hookeriana, Himalayan sarcococca |
| Sarcococca orientalis, Oriental sarcococca |
| Sarcococca ruscifolia, Fragrant sarcococca |
| Sarracenia spp., Pitcher plant |
| Sarracenia ssp. jonesi,
Pitcher plant |
| Sarracenia alata, Sweet pitcher
plant; Yellow trumpets |
| Sarracenia drummondii = S. leucophyla,
Crimson pitcher plant |
| Sarracenia flava, Yellow pitcher
plant |
| Sarracenia minor, Hooded pitcher
plant |
| Sarracenia psittacina,
Parrot pitcher plant |
| Sarracenia purpurea, Purple
pitcher plant |
| Sarracenia rubra, Miniature
huntsman; Red pitcher plant |
| Sasa veitchii, Nagasa bamboo |
| Sassafras albidum, Sassafrass |
| Satureja hortensis, Summer savory |
| Satureja montana, Winter savory |
| Saururus cernuus, American swamp lily; Lizard's tail |
| Saururus cernuus, Lizard's tail |
| Saxifraga michauxii, Michaux's saxifrage |
| Saxifraga stolonifera, Strawberry begonia |
| Saxifraga stolonifera, Strawberry geranium |
| Saxifraga virginiensis, Early saxifrage |
| Scabiosa atropurpurea, Scabiosa |
| Scabiosa caucasica, Pincushion flower |
| Scadoxus = Haemanthus, Torch lily; Paint brush; Blood lily |
| Scaevola aemula, Fan flower |
| Schizachyrium scoparium, Little bluestem |
| Schizanthus pinnatus, Butterfly flower |
| Schizophragma hydrangeoides, Japanese hydrangea vine |
| Schizophragma integrifolium, Chinese hydrangea-vine |
| Schizostylis coccinea, Kaffir lily |
| Schizostylis, Kaffir lily; Crimson flag |
| Sciadopitys verticillata, Umbrella pine; Japanese umbrella pine |
| Scilla campanulata (Endymion, Hyacinthoides), Spanish Blue-Bells; Wood Hyacinths |
| Scilla siberica; S. tubergeniana, Siberian Squill |
| Scripus laustris subsp. tabernaemontani 'Zebrinus', Zebra rush |
| Scutellaria incana, Downy skullcap; Skull cap |
| Scutellaria integrifolia, Hyssop skullcap; Large skullcap |
| Scutellaria serrata, Showy skullcap |
| Scutellaria, Hoary skullcap |
| Sedum 'Autumn Joy', Autumn Joy sedum |
| Sedum 'Matrona', Matrona stonecrop |
| Sedum acre, Gold-moss; Stonecrop |
| Sedum album, White stonecrop |
| Sedum cauticola, -- |
| Sedum kamtschaticum var. floriferum 'Weihenstepharis Gold', Gold sedum |
| Sedum kamtschaticum, Kamschatka sedum |
| Sedum lineare 'Variegatum', Variegated stonecrop |
| Sedum makinoi, -- |
| Sedum middendorf, Stonecrop |
| Sedum sieboldii, October daphne |
| Sedum spectabile, Showy stonecrop; Ice plant |
| Sedum spp., Sedum; Stonecrop |
| Sedum spurium 'John Creech', John Creech sedum |
| Sedum spurium, Two-row stonecrop; Creeping stonecrop |
| Sedum telepnoides, Wild live-forever |
| Sedum ternatum, Three-leaved stonecrop; Mountain stonecrop |
| Sedum ternatum, Wild stonecrop |
| Sedum tetractinum, Chinese sedum |
| Selaginella braunii, Arborvitae fern |
| Selaginella uncinata, Peacock moss |
| Senecio aureus, Golden ragwort |
| Sequoia sempervirens 'Adpressa', Coastal redwood |
| Sequoia sempervirens 'Soquel', Soquel redwood |
| Sequoia sempervirens, Redwood |
| Sequsiadendron giaganteum, Sierra redwood |
| Serissa foetida, Japanese serissa; Yellowrim |
| Sesbania punicea, Rattlebush |
| Sesleria autumnalis, Autumn moor grass |
| Sesleria caerulea, Blue moor grass |
| Sesleria heufleriana, Blue-green moor grass |
| Setcreasea pallida 'Purple Heart', Purple heart; Wandering Jew |
| Shepherdia argentea, Silver buffaloberry |
| Shortia galacifolia, Oconee bells; Shortia |
| Silene stellata, Starry campion |
| Silene virginica, Fire pink; Indianpink |
| Silphinum integrifolium, Rosinweed |
| Silphinum perfoliatum, Cup-plant; Compass-plant |
| Silphinum terebinthinaceum, Prairie-dock |
| Sinocalycanthus chinensis, Chinese sweetshrub |
| Sinojackia rehderiana, Jacktree |
| Sinojackia rehderiana, Jacktree |
| Sisyrinchium angustifolium, Blue-eyed grass |
| Skimmia japonica, Japanese skimmia |
| Smilacina racemosa, False Solomon's seal |
| Smilax glauca, Greenbriar; Smilax |
| Smilax herbacea, Carrion-flower |
| Smilax lanceolata, Smilax |
| Smilax smalli, Smilax; Jacksonbrier |
| Solanum carolinense, Horse-nettle |
| Solanum jasminoides, Potato vine |
| Solenostemon pumilus; Coleus pumilus, Trailing coleus |
| Solidago bicolor, Silver-rod; White goldenrod |
| Solidago caesia, Blue stemmed goldenrod; Axillary goldenrod; Woodland goldenrod |
| Solidago juncea, Early goldenrod |
| Solidago nemoralis, Common goldenrod; Gray goldenrod |
| Solidago sempervirens, Seaside goldenrod |
| Solidago speciosa, Showy goldenrod |
| Solidago spp., Erect goldenrod; Goldenrod |
| Solidago uliginosa, Bog goldenrod |
| Sonchus asper, Spiny-leaved sow-thistle |
| Sophora davidii = S. viciifolia, David's mountain laurel |
| Sophora japonica, Japanese pagoda |
| Sorbaria sorbifolia, False spirea |
| Sorbus alnifolia, Korean mountainash |
| Sorbus americana, American mountainash |
| Sorbus aucuparia, European mountainash |
| Sorbus commixta, Japanese mountainash |
| Sorphaatum nutans, Indian grass |
| Sparaxis hybrids, Harlequin Flower |
| Sparaxis, Harlequin flower; Wand flower |
| Spartina pectinata, Prairie cord grass |
| Spartium junceum, Spanish broom |
| Spigelia marilandica, Indian pink |
| Spiraea albiflora, Japanese white spirea |
| Spiraea cantoniensis, Double Reeves spirea |
| Spiraea fritschiana, Koreean spirea; Fritschiana spirea |
| Spiraea japonica, Japanese spirea |
| Spiraea nipponica 'Snowmound', Snowmound spirea |
| Spiraea plenaflora 'Plena', Bridalwreath spirea |
| Spiraea prunifolia, Bridalwreath spirea |
| Spiraea salicifolia -- |
| Spiraea thunbergii, Thunberg spirea |
| Spiraea tomentosa, Hardbark spirea; Steeplebush |
| Spiraea tomentosa, Hardhack; Spirarea |
| Spiraea trilobata, Threelobe spirea |
| Spiraea x billiardii, Billiard spirea |
| Spiraea x bumalda 'Anthony Waterer', Anthony Waterer spirea |
| Spiraea x bumalda, Bumalda spirea |
| Spiraea x cinerea 'Grefsheim', Grefsheim spirea |
| Spiraea x vanhouttei, Vanhoutte spirea |
| Spiranthes cernua, Nodding ladies tresses |
| Spiranthes lacera var. gracilis, Slender ladies tresses |
| Spiranthes tuberosa var. gracilis, Little ladies tresses |
| Spodiopogon sibiricus, Spodiopogon; Siberian graybeard; Frost grass |
| Sporobolis airoides, Alkali dropseed |
| Sporobolus heterolepisis, Prairie droopseed |
| Sprekelia, Aztec lily; Jacobean lily; St. James lily |
| Stachys byzantina, Lamb's ear |
| Stachys tenuifolia, Smooth hedge-nettle |
| Stachyurus chinensis, Chinese stachyurus |
| Stachyurus praecox, Stachyurus |
| Staphylea colchica, Colchis bladdernut |
| Staphylea holocarpa, Chinese bladdernut |
| Staphylea pinnate, European bladdernut |
| Staphylea trifolia, American bladdernut |
| Staphylea trifolia, American bladdernut |
| Staphylea x 'Elegans',Elegans bladdernut |
| Stauntonia hexaphylla 'Cartwheel', Stauntonia vine |
| Stella pubera, Giant chickweed |
| Stellaria pubera, Giant chickweed; Star chickweed |
| Stenanthium gramineum, Feather bells |
| Stephandra incisa, Cutleaf stephanandra; Lace shrub |
| Sternbergia lutea, Winter daffodil; Fall daffodil |
| Stewarta koreana, Korean stewarta |
| Stewarta rostrata, Upright stewarta |
| Stewarta rostrata, Upright stewarta |
| Stewartia malacodendron, Silky camellia |
| Stewartia malacodendron, Silky camellia; Stewartia |
| Stewartia monadelpha, Tall stewartia |
| Stewartia ovata, Mountain camellia |
| Stewartia ovata, Mountain camellia |
| Stewartia pseudocamellia, Japanese stewartia |
| Stipa tenacissima, Needle grass; Esparto grass; Mexican feather grass |
| Stokesia laevis, Stokes' aster |
| Streptopus amplexifolius, Twisted stalk; White mandarin |
| Strobilanthes dyerianus, Persian shield |
| Stylophorum diphyllum, Celandine poppy; Yellow wood poppy |
| Stylosanthes biflora, Pencil flower |
| Styrax americana, American snowbell |
| Styrax americana, American snowbell; Storax |
| Styrax grandifolius, Bigleaf snowbell |
| Styrax grandifolius, Bigleaf snowbell |
| Styrax japonica, Japanese snowbell |
| Styrax japonicus, Japanese snowbell |
| Styrax obassia, Fragrant styrax |
| Sutera corda, Bacopa |
| Sycopsis sinensis, Chinese fighazel |
| Symphoricarpos albus, Common snowberry |
| Symplocarpus foetidus, Skunk cabbage |
| Symploccos paniculata, Sapphireberry; Asiatic sweetleaf |
| Symplocos tinctoria, Horsesugar |
| Syringa julianae, Lilac |
| Syringa laciniata, Cutleaf lilac |
| Syringa meyeri, Meyer lilac |
| Syringa oblata var. dilatata, Korean early lilac |
| Syringa oblata, Early lilac |
| Syringa patula, Korean lilac; Manchurian lilac |
| Syringa pekinensis, Peking lilac |
| Syringa reticulata, Japanese tree lilac |
| Syringa villosa, Late lilac |
| Syringa vulgaris, Common lilac; French lilac |
| Syringa x persica, Persian lilac |