SALIX hastata ‘Wehrhahnii’
SALIX ‘Boydii’
SALIX fargesii
SALVIA aucheri
SALVIA discolor
SALVIA glutinosa
SALVIA involucrata
SALVIA involucrata ‘Bethellii’
SALVIA involucrata ‘Hardy Form’
SALVIA japonica
SALVIA microphylla purple
SALVIA nemorosa
SALVIA spathacea
SALVIA verticillata ‘Purple Rain’
SALVIA officinalis ‘Berggarten’
SALVIA forsskaolii
SALVIA arizonica
SALVIA ‘Belhaven’
SALVIA sylvestris ‘Viola Klose’
SALVIA superba ‘Superba’
SALVIA verticillata
SALVIA pratensis Bertolonii Group
SALVIA hians
SALVIA sclarea turkestanica
SALVIA sclarea ‘Vatican White’
SALVIA bulleyana
SALVIA przewalskii mandarinorum
SALVIA verticillata ‘Alba’
SALVIA sylvestris ‘Blauhügel’
SALVIA concolor
SAMBUCUS canadensis ‘Laciniata’
SAMBUCUS racemosa ‘Sutherland Gold’
SAMBUCUS nigra ‘Pulverulenta’
SAMBUCUS nigra ‘Marginata’
SAMBUCUS nigra ‘Ardwall’
SAMBUCUS nigra ‘Guincho Purple’
SANGUINARIA canadensis
SANGUISORBA albiflora
SANGUISORBA ‘Big Tanna’
SANGUISORBA canadensis
SANGUISORBA tenuifolia hybrids ex. Russia
SANGUISORBA ‘Tanna’
SANGUISORBA tenuifolia
SANGUISORBA magnifica
SANGUISORBA officinalis ‘Tanna’
SANGUISORBA tenuifolia ‘Alba’
SANGUISORBA stipulata
SANGUISORBA obtusa
SANGUISORBA species ex. Japan
SANGUISORBA menziesii
SAPONARIA species ex. Ron
SAPONARIA lempergii ‘Max Frei’
SARCOCOCCA confusa
SARCOCOCCA hookeriana digyna
SARUMA henryi
SASAELLA masamuneana aureostriata
SAXIFRAGA stolonifera ‘Cuscutiformis’
SAXIFRAGA polita ‘Dentata’
SAXIFRAGA stolonifera ‘Kinki Purple’
SAXIFRAGA fortunei ‘Rubrifolia’
SAXIFRAGA urbium
SAXIFRAGA pensylvanica
SAXIFRAGA fortunei ‘Mount Nachi’
SAXIFRAGA urbium ‘Aureopunctata’
SAXIFRAGA paniculata ex. Tatra
SAXIFRAGA urbium ‘Clarence Elliott’
SAXIFRAGA stolonifera ‘Hsitou Silver’
SAXIFRAGA cortusifolia stolonifera
SAXIFRAGA fortunei
SAXIFRAGA urbium ‘Letchworth Gem’
SCABIOSA atropurpurea ‘Chile Black’
SCABIOSA atropurpurea ‘Chile Red’
SCABIOSA lachnophylla
SCABIOSA columbaria ochroleuca
SCABIOSA japonica alpina
SCADOXUS species
SCADOXUS puniceus
SCHIZOPHRAGMA corylifolium
SCHIZOPHRAGMA hydrangeoides
SCHIZOPHRAGMA hydrangeoides ‘Moonlight’
SCHIZOPHRAGMA hydrangeoides ‘Roseum’
SCHIZOPHRAGMA integrifolium
SCHIZOPHRAGMA ex. New Zealand
SCHIZOPHRAGMA species ex India
SCHIZOSTYLIS coccinea ‘Hilary Gould’
SCHIZOSTYLIS coccinea ‘Tambara’
SCHIZOSTYLIS coccinea ‘Major’
SCHIZOSTYLIS coccinea ‘Professor Barnard’
SCHIZOSTYLIS coccinea ‘November Cheer’
SCHIZOSTYLIS coccinea ‘Sunrise’
SCHIZOSTYLIS coccinea ‘Viscountess Byng’
SCHIZOSTYLIS coccinea
SCILLA natalensis
SCILLA bifolia
SCOPOLIA carniolica
SCOPOLIA carniolica hladnikiana
SCROPHULARIA auriculata ‘Variegata’
SCUTELLARIA orientalis
SCUTTELARIA altissima
SEDUM ‘Bertram Anderson’
SEDUM ‘Shale Flats’
SEDUM telephium ‘Atropurpureum’
SEDUM erythrostictum ‘Frosty Morn’
SEDUM telephium
SEDUM ‘Stewed Rhubarb Mountain’
SEDUM telephium ruprechtii
SEDUM verticillatum
SEDUM cauticola ‘Purpurine’
SEDUM spathulifolium ‘Cape Blanco’
SEDUM orbiculatum
SEDUM ‘Sunset Cloud’
SEDUM ex. Tien Shan
SEDUM populifolium
SEDUM cauticola
SEDUM ussuriense
SEDUM telephium ex. Russia
SEDUM spectabile
SEDUM telephium ‘Mohrchen’
SEDUM aizoon
SEDUM species ex. AP
SEDUM telephium ‘Matrona’
SEDUM cauticola hybrid
SEDUM ‘Abbeydore’
SEDUM ‘Purple Emperor’
SELINUM wallichianum
SEMPERVIVUM tectorum ‘Atroviolaceum’
SEMPERVIVUM ‘Atropurpureum’
SENECIO aschenbornianus
SENECIO cannabifolius
SENECIO smithii
SENECIO polyodon
SESLERIA sadleriana
SESLERIA ‘Morning Dew’
SHIBATAEA kumasasa
SIDALCEA candida
SIDALCEA ‘Sussex Beauty’
SIDALCEA ‘Elsie Heugh’
SIDALCEA neomexicana
SIDALCEA ‘Oberon’
SILENE asterias
SILENE uniflora ‘Flore Pleno’
SILENE uniflora ‘Druett’s Variegated’
SILENE uniflora ‘Compacta’
SILENE ex. Uzbeckistan
SILENE fimbriata
SINOFRANCHETIA chinensis
SISIRYNCHIUM species
SISYRINCHIUM ‘Pole Star’
SISYRINCHIUM striatum
SISYRINCHIUM angustifolium
SISYRINCHIUM species
SKIMMIA confusa ‘Kew Green’
SMILACINA racemosa
SMILACINA racemosa amplexicaulis
SMILACINA species
SMILACINA stellata
SMILACINA species ex. Japan
SMILAX discotis
SMILAX ferox
SOLANUM laxum ‘Album’
SOLARIA species
SOLARIA atropurpurea
SOLDANELLA carpatica
SOLIDAGO sphacelata ‘Golden Fleece’
SOPHORA tetraptera
SORBARIA kirilowii
SORBUS reducta
SORBUS species AP126
SORBUS integrifolia
SPARTINA pectinata ‘Aureomarginata’
SPEIRANTHA convallarioides
SPHAERALCEA coccinea
STACHYS byzantina
STACHYS byzantina ‘Cotton Boll’
STACHYS citrina
STACHYS discolor
STACHYS niveum
STACHYS officinalis ‘Rosea’
STACHYS macrantha ‘Robusta’
STACHYS macrantha ‘Nivea’
STACHYS macrantha ‘Cally Splash’
STACHYS byzantina ‘Big Ears’
STACHYS monieri ‘Saharan Pink’
STACHYS monieri ‘Hummelo’
STACHYURUS chinensis
STAPHYLEA colchica
STAUNTONIA hexaphylla
STEMMACANTHA centauriodes
STIPA capillata ‘Brautschleier’
STIPA joannis
STIPA lessingiana
STIPA capillata
STIPA gigantea ‘Pixie’
STIPA pulcherrima
STIPA tenuifolia
STIPA pennata
STIPA gigantea
STIPA arundinacea
STOKESIA laevis ‘Mary Gregory’
STOKESIA laevis ‘Purple Parasols’
STOKESIA laevis ‘Blue Star’
STOKESIA laevis ‘Silver Moon’
STOKESIA laevis ‘Alba’
STOKESIA laevis ‘Wyoming’
STROBILANTHES attenuata
STROBILANTHES wallichii
STROBILANTHES species
SYCOPSIS sinensis
SYMPHYTUM ‘Goldsmith’
SYMPHYTUM ‘Langthorns Pink’
SYMPHYTUM orientale
SYMPHYTUM uplandicum ‘Variegatum’
SYNEILESIS aconitifolia
SYNTHYRIS missurica stellata
SYNTHYRIS reniformis
SYRINGA pinnatifolia