Last updated October 1, 2009
| NAME | FAMILY | NATIVITY |
| Sabal bahamensis | Arecaceae | Bahamas |
| Sabal bermudana | Arecaceae | Bermuda |
| Sabal blackburniana | Arecaceae | Bahamas(Santa Domingo Cay) |
| Sabal mauritiiformis | Arecaceae | Cen and S America, Trinidad |
| Sabal minor | Arecaceae | SE United States |
| Sabal parviflora | Arecaceae | Cuba |
| Sabal uresana | Arecaceae | NW Mexico |
| Sabal yapa | Arecaceae | W Cuba, Mexico(Yucatan),Belize |
| Saccharum cv. | Poaceae | |
| Sagittaria lancifolia | Alismataceae | American Tropics |
| Salix babylonica | Salicaceae | Asia |
| Salix babylonica cv. Crispa | Salicaceae | |
| Salix laevigata | Salicaceae | SW United States |
| Salix lasiandra | Salicaceae | W N. America |
| Salix lasiolepis | Salicaceae | W N. America |
| Salvia apiana | Lamiaceae | California |
| Salvia brandegeei | Lamiaceae | California, Mexico(Baja, CA) |
| Salvia brandegeei cv. Pacific Blue | Lamiaceae | California, Mexico(Baja, CA) |
| Salvia cedrosensis | Lamiaceae | Mexico(Baja CA) |
| Salvia chamaedryoides | Lamiaceae | Mexico |
| Salvia chiapensis | Lamiaceae | Mexico |
| Salvia clevelandii | Lamiaceae | S California, Mexico(Baja, CA) |
| Salvia clevelandii cv. Winifred Gilman | Lamiaceae | S. Calif., Baja |
| Salvia clevlandii cv. Winifred Gilman | Lamiaceae | |
| Salvia cv. Allen Chickering | Lamiaceae | |
| Salvia cv. Anthony Parker | Lamiaceae | |
| Salvia cv. Bee’s Bliss | Lamiaceae | |
| Salvia cv. Dara’s Choice | Lamiaceae | |
| Salvia cv. Purple Majesty | Lamiaceae | |
| Salvia cv. Starlight | Lamiaceae | |
| Salvia cv. Vicki Romo | Lamiaceae | |
| Salvia cv. Waverly | Lamiaceae | |
| Salvia elegans | Lamiaceae | S Mexico, Guatemala |
| Salvia greggii | Lamiaceae | SW Texas to N Cen Mexico |
| Salvia guaranitica | Lamiaceae | Argentina, Brazil, Paraguay |
| Salvia leucantha | Lamiaceae | Mexico |
| Salvia leucophylla | Lamiaceae | |
| Salvia leucophylla cv. Amethyst Bluff | Lamiaceae | |
| Salvia leucophylla cv. Figueroa | Lamiaceae | |
| Salvia leucophylla cv. Point Sal Spreader | Lamiaceae | |
| Salvia mellifera | Lamiaceae | California |
| Salvia muelleri | Lamiaceae | Mexico |
| Salvia sagittata | Lamiaceae | Ecuador |
| Salvia sp. | Lamiaceae | |
| Salvia spathacea | Lamiaceae | |
| Salvia spathacea | Lamiaceae | Coastal California |
| Salvia splendens | Lamiaceae | Brazil |
| Salvia uliginosa | Lamiaceae | South America |
| Sambucus mexicana | Caprifoliaceae | W N. America |
| Sambucus nigra cv. Variegata | Caprifoliaceae | |
| Sansevieria cylindrica | Dracaenaceae | Africa |
| Sansevieria deserti | Dracaenaceae | South Africa, Zimbabwe |
| Sansevieria masoniana | Dracaenaceae | Congo |
| Sansevieria patens | Dracaenaceae | Africa |
| Sansevieria rorida | Dracaenaceae | Somalia |
| Sansevieria sp. | Dracaenaceae | Africa |
| Sansevieria sp. | Dracaenaceae | Somalia |
| Sansevieria trifasciata cv. Moonshine | Dracaenaceae | |
| Santolina pinnata ssp. neapolitana cv. Lemon Queen | Asteraceae | |
| Sapindus saponaris | Sapindaceae | African Tropics |
| Sarcostemma stolonifera | Asclepiadaceae | Kenya, N Tanzania |
| Sarcostemma viminale | Asclepiadaceae | Africa |
| Sasa veitchii | Poaceae | Japan |
| Saxifraga stolonifera | Saxifragaceae | E Asia |
| Scabiosa sp. | Dipsacaceae | |
| Scadoxus multiflorus ssp. katharinae | Amaryllidaceae | South Africa |
| Scaevola cv. Mauve Clusters | Goodeniaceae | |
| Scaevola cv. Pink Carpet | Goodeniaceae | |
| Schizolobium parahybum | Caesalpiniaceae | S Mexico to S Brazil |
| Schlumbergera sp. | Cactaceae | |
| Schoenus nigricans | Cyperaceae | Europe |
| Schotia afra | Caesalpiniaceae | SW South Africa |
| Schotia brachypetala | Caesalpiniaceae | South Africa |
| Sciadopitys verticillata | Taxodiaceae | Japan |
| Scilla hyacinthoides | Hyacinthaceae | Mediterranean |
| Scilla natalensis | Hyacinthaceae | South Africa |
| Sedum acre | Crassulaceae | Europe, Asia Minor |
| Sedum album cv. Nigra | Crassulaceae | Europe |
| Sedum brevifolium | Crassulaceae | W Europe |
| Sedum clavatum | Crassulaceae | Mexico |
| Sedum confusum | Crassulaceae | Mexico |
| Sedum dasyphyllum | Crassulaceae | N Africa, S & W Europe |
| Sedum hybrid | Crassulaceae | |
| Sedum morganianum | Crassulaceae | Mexico |
| Sedum nussbaumerianum | Crassulaceae | Mexico |
| Sedum ochroleucum | Crassulaceae | Europe |
| Sedum pachyphyllum | Crassulaceae | S Mexico |
| Sedum sp. | Crassulaceae | |
| Sedum spurium cv. Fuldaglut | Crassulaceae | |
| Sedum torulosum | Crassulaceae | Mexico |
| Sedum x rubrotinctum | Crassulaceae | |
| Sedum x rubrotinctum cv. Aurora | Crassulaceae | |
| Selenicereus anthonyanus | Cactaceae | Mexico |
| Selenicereus chrysocardium | Cactaceae | Mexico(Chiapas) |
| Selenicereus coniflorus | Cactaceae | E Mexico |
| Selenicereus grandiflorus | Cactaceae | Jamaica, Cuba |
| Selenicereus hamatus | Cactaceae | Mexico(Veracruz, Jalapa) |
| Selenicereus inermis | Cactaceae | Venezuela, Colombia |
| Selenicereus macdonaldiae | Cactaceae | Central America |
| Selenicereus megalanthus | Cactaceae | |
| Selenicereus wercklei | Cactaceae | Costa Rica |
| Sempervivum arachnioidium cv. Pekingense | Crassulaceae | |
| Sempervivum calcareum | Crassulaceae | SW Alps |
| Sempervivum cv. Silverine | Crassulaceae | |
| Senecio articulatus | Asteraceae | South Africa |
| Senecio articulatus v. variegatus | Asteraceae | South Africa |
| Senecio cineraria | Asteraceae | |
| Senecio citriformis | Asteraceae | South Africa |
| Senecio haworthii | Asteraceae | South Africa(N. Cape Province) |
| Senecio jacobsenii | Asteraceae | Kenya, Tanzania |
| Senecio macroglossus cv. Variegatum | Asteraceae | |
| Senecio mandraliscae | Asteraceae | South Africa |
| Senecio picticaulis | Asteraceae | E Africa |
| Senecio praecox | Asteraceae | Mexico |
| Senecio tropaeolifolius | Asteraceae | South Africa |
| Senna didymobotrya | Caesalpiniaceae | E Africa |
| Senna petersiana | Caesalpiniaceae | |
| Sequoia sempervirens | Taxodiaceae | California, Oregon |
| Sequoia sempervirens cv. Santa Cruz | Taxodiaceae | |
| Serenoa repens | Arecaceae | SE United States |
| Sesleria autumnalis | Poaceae | Italy |
| Silene regia | Caryophyllaceae | Central United States |
| Sinarundinaria nitida | Poaceae | Cen China |
| Sinningia areneosa | Gesneriaceae | Brazil |
| Sinningia piresiana | Gesneriaceae | Brazil |
| Sinningia sellovii | Gesneriaceae | Argentina, Brazil |
| Sinningia speciosa | Gesneriaceae | Brazil |
| Sinningia warmingii | Gesneriaceae | South America |
| Sisyrinchium californicum | Iridaceae | N CA to British Columbia |
| Solanum jasminoides | Solanaceae | Brazil |
| Soleirolia soleirolii | Urticaceae | Mediterranean |
| Solidago californica | Asteraceae | Western US |
| Sollya heterophylla | Pittosporaceae | Australia |
| Sollya heterophylla | Pittosporaceae | SW Australia |
| Sonchus acaulis | Asteraceae | Spain(Canary Islands) |
| Sparmannia africana | Tiliaceae | South Africa |
| Spathiphyllum sp. | Araceae | |
| Sphaeropteris cooperi | Cyatheaceae | Australia |
| Sphaeropteris cooperi cv. Brentwood | Cyatheaceae | |
| Sporobolus airoides | Poaceae | W United States |
| Stachys byzantina | Lamiaceae | Turkey |
| Stachys chrysantha | Lamiaceae | Greece |
| Stangeria eriopus | Stangeriaceae | South Africa |
| Stanhopea wardii | Orchidaceae | Mexico |
| Stenocactus aff. pentacanthus | Cactaceae | Mexico |
| Stenocactus coptonogonus | Cactaceae | Mexico |
| Stenocactus sp. | Cactaceae | |
| Stenocactus sp. | Cactaceae | Mexico |
| Stenocactus vaupelianus | Cactaceae | Mexico(Hidalgo) |
| Stenocarpus sinuatus | Proteaceae | E Australia |
| Stenocereus alamosensis | Cactaceae | Mexico(Chihuahua, Sonora) |
| Stenocereus beneckei | Cactaceae | Mexico |
| Stenocereus eruca | Cactaceae | Mexico(Baja California Sur) |
| Stenocereus fimbriatus | Cactaceae | Caribbean |
| Stenocereus griseus | Cactaceae | Mexico to Venezuela |
| Stenocereus gummosus | Cactaceae | S California to Mexico |
| Stenocereus macdowellii | Cactaceae | |
| Stenocereus pruinosus | Cactaceae | Cen & S Mexico |
| Stenocereus sp. | Cactaceae | Mexico |
| Stenocereus stellatus | Cactaceae | Mexico |
| Stenocereus thurberi | Cactaceae | S Arizona to Mexico |
| Stenocereus thurberi ssp. littoralis | Cactaceae | S Arizona to Mexico |
| Stenocereus victoriensis | Cactaceae | |
| Stephanotis floribunda | Asclepiadaceae | Madagascar |
| Sterculia africana | Sterculiaceae | Zimbabwe |
| Stetsonia coryne | Cactaceae | Argentina, Bolivia |
| Strelitzia juncea | Strelitziaceae | South Africa |
| Strelitzia nicolai | Strelitziaceae | South Africa |
| Strelitzia reginae | Strelitziaceae | Africa |
| Strelitzia reginae cv. Mandela’s Gold | Strelitziaceae | |
| Streptocarpus x hybridus | Gesneriaceae | |
| Stromanthe sanguinea | Marantaceae | Brazil |
| Swietenia mahagoni | Meliaceae | Caribbean |
| Syagrus comosa | Arecaceae | Brazil |
| Syagrus coronata | Arecaceae | Brazil |
| Syagrus flexuosa | Arecaceae | Brazil |
| Syagrus romanzoffiana | Arecaceae | South America |
| Syagrus schizophylla | Arecaceae | Brazil |
| Syagrus sp. | Arecaceae | Bolivia |
| Synadenium cupulare | Euphorbiaceae | South Africa |
| Syzygium dombeyi | Myrtaceae | Brazil |
| Syzygium paniculatum | Myrtaceae | Australia |
| Syzygium paniculatum cv. Globulus | Myrtaceae | |
| Syzygium paniculatum cv. Monterey Bay | Myrtaceae | |
| Syzygium paniculatum cv. Teenie Genie | Myrtaceae |
