| | | | |
| S | Genus | Species | Cultivar | Common Name |
 | SALVIA | | 'Indigo Spires' | |
| SALVIA | | 'Mulberry Jam' | |
| SALVIA | | 'Salmon' | |
| SALVIA | | 'Waverly' | |
| SALVIA | blancoana | | Spanish Sage |
| SALVIA | blepharophylla | | |
| SALVIA | buchananii | | AGM |
| SALVIA | confertiflora | | |
| SALVIA | darcyi | | |
| SALVIA | discolor | | |
| SALVIA | dolichantha | | |
| SALVIA | elegans | 'Scarlet Pineapple' | Pineapple Sage. Syn S.rutilans |
| SALVIA | forsskaolii | | |
| SALVIA | glutinosa | | |
| SALVIA | greggii | 'CD&R' 1148 | |
| SALVIA | greggii | 'Icing Sugar' | |
| SALVIA | greggii | 'Navajo Purple' | |
| SALVIA | greggii | 'Peach' | |
| SALVIA | greggii | 'Stormy Pink' | |
| SALVIA | greggii | x serpyllifolia | syn. S.g. x lyciodies |
| SALVIA | guaranitica | 'Blue Enigma' | AGM syn. S.ambigens |
| SALVIA | interrupta | | |
| SALVIA | involucrata | | AGM |
| SALVIA | leucantha | | AGM |
| SALVIA | microphylla | 'Blush Pink' | |
| SALVIA | microphylla | 'Pink Blush' | AGM |
| SALVIA | microphylla | var. microphylla | syn. S.grahamii |
| SALVIA | microphylla | var. neurepia | |
| SALVIA | nemorosa | 'Caradonna' | |
| SALVIA | nemorosa | 'Lubecca' | AGM |
| SALVIA | nemorosa | 'Pusztaflamme' | AGM syn. S. 'Plumosa' |
| SALVIA | officinalis | 'Berggarten' | |
| SALVIA | patens | | AGM Gentian Sage |
| SALVIA | patens | 'Blue Angel' | |
| SALVIA | patens | 'Cambridge Blue' | AGM |
| SALVIA | pratensis | 'Indigo' | AGM |
| SALVIA | przewalskii | | |
| SALVIA | sclarea var. turkestanica | | Biennial Clary |
| SALVIA | transsylvanica | 'Blue Spire' | |
| SALVIA | uliginosa | | AGM Bog Sage |
| SALVIA | verticillata | 'Alba' | |
| SALVIA | x jamensis | 'Desert Blaze' | |
| SALVIA | x jamensis | 'Hot Lips' | |
| SALVIA | x jamensis | 'La Luna' | |
| SALVIA | x jamensis | 'Raspberry Royale' | AGM |
| SALVIA | x jamensis | 'Trebah' | syn. S.'Trebah Lilac White' |
| SALVIA | x sylvestris | 'Blauhugel' | AGM |
| SALVIA | x sylvestris | 'Mainacht' | AGM syn. S.'May Night' |
| SALVIA | x sylvestris | 'Rose Queen' | |
| SALVIA | x sylvestris | 'Viola Klose' | |
| SANGUISORBA | menziesii | | |
| SANGUISORBA | obtusa | | |
| SANGUISORBA | officinalis | 'Pink Tanna' | |
| SANGUISORBA | tenuifolia | | |
| SANGUISORBA | tenuifolia | var alba | |
| SANTOLINA | pinnata subsp.neapolitana | 'Edward Bowles' | AGM Syn. S.neapolitana |
| SANTOLINA | rosmarinifolia | subsp. Romarinifolia | Syn. S.viridis |
| SAPONARIA | x lempergii | 'Max Frei' | |
| SAXIFRAGA | | 'Rubrifolia' | syn. S.fortunei 'Rubrifolia' |
| SAXIFRAGA | | 'Southside Seedling Group' | AGM |
| SAXIFRAGA | | 'Wada' | |
| SCABIOSA | atropurpurea | 'Ace of Spades' | |
| SCABIOSA | caucasica | 'Blausiegel' | |
| SCABIOSA | caucasica | 'Miss Wilmott' | AGM |
| SCABIOSA | caucasica | 'Stafa' | |
| SCHIZOSTYLIS | coccinea | 'Major' | AGM |
| SCHIZOSTYLIS | coccinea | 'Pink Princess' | syn. S.c.'Wilfred H Bryant' |
| SCHIZOSTYLIS | coccinea | 'Sunrise' | AGM syn. 'Sunset' |
| SCOPOLIA | carniolica | | |
| SEDUM | | 'Autumn Joy' | syn S.'Herbstfreude' |
| SEDUM | | 'Bertram Anderson' | AGM |
| SEDUM | | 'Carl' | |
| SEDUM | | 'Jose Aubergine' | |
| SEDUM | | 'Joyce Henderson' | |
| SEDUM | | 'Matrona' | AGM |
| SEDUM | | 'Purple Emperor' | |
| SEDUM | | 'Raspberry Red' | |
| SEDUM | | 'Red Cauli' | |
| SEDUM | | 'Ruby Glow' | AGM |
| SEDUM | | 'Stewed Rhubarb Mountain' | |
| SEDUM | | 'Vera Jameson' | AGM |
| SEDUM | | 'Xenox' | |
| SEDUM | cauticola | 'Coca-cola' | |
| SEDUM | erythrostictum | 'Frosty Morn' | |
| SEDUM | spectabile | | AGM Ice Plant |
| SEDUM | spectabile | 'Iceberg' | |
| SEDUM | spurium | 'Variegatum' | |
| SEDUM | telephium subsp. | ruprectii | |
| SEDUM | telephium subsp. Ruprectii | 'Hab Grey' | |
| SELINUM | wallichianum | | syn. S. tenuifolium |
| SESELI | libanotis | | Moon carrot |
| SIDALCEA | | 'Croftway Red' | |
| SIDALCEA | | 'Elsie Heugh' | |
| SIDALCEA | | 'Party Girl' | |
| SIDALCEA | | 'Rose Queen' | Prairie Mallow |
| SIDALCEA | | 'Sussex Beauty' | |
| SIDALCEA | | 'Wine Red' | |
| SIDALCEA | candida | | |
| SILENE | fimbriata | | |
| SINNINGIA | tuberosa | | |
| SISYRINCHIUM | | 'E.K. Balls' | |
| SISYRINCHIUM | | 'Quaint 'n' Queer' | |
| SISYRINCHIUM | | 'Raspberry' | |
| SISYRINCHIUM | angustifolium | album | |
| SISYRINCHIUM | striatum | | |
| SMYRNIUM | olusatrum | | Alexanders |
| SOLANUM | rantonnetii | | |
| SOLIDAGO | | 'Goldkind' | syn S.'Golden Baby' |
| SOLIDAGO | | 'Ledsham' | |
| SOLLYA | heterophylla | | AGM Bluebell Creeper |
| SPHAERALCEA | | 'Childerley' | |
| SPIRANTHES | cernua var. odorata | 'Chadd's Ford' | |
| STACHYS | byzantina | | syn. S.lanata. Lambs' Ears |
| STACHYS | byzantina | 'Silver Carpet' | |
| STACHYS | officinalis | | Betony |
| STIPA | gigantea | | AGM Giant Feather Grass |
| STIPA | tenuifolia | | |
| STROBILANTHES | atropurpurea (attenuata) | | |
| SYMPHYANDRA | campanulatum | | |
| SYMPHYTUM | | 'Goldsmith' | |
| SYRINGA | palibiniana | | Miniature Lilac |