Sidalcea x 'Party Girl' Sidalcea malviflora 'Elsie Heugh'
Sidalcea malviflora 'Little Princess' Silene dioica 'Clifford Moor'
Silene latifolia Silene polypetala
Silene uniflora Silene uniflora 'Druett's Variegated'
Silene uniflora 'Swan Lake' Silene virginica
Silphium gracile Silphium perfoliatum
Sinarundinaria nitida Sinningia sellovii
Sinningia speciosa Sisyrinchium angustifolium
Sisyrinchium angustifolium 'Lucerne' Sisyrinchium angustifolium 'Quaint & Queer'
Sisyrinchium angustifolium 'Variegatum' Sisyrinchium bellum
Sisyrinchium bellum 'Rocky Point' Sisyrinchium californicum
Sisyrinchium striatum Slc 'Eureka'
Slc 'Mine Gold' Slc 'Riffe'
Smilax rotundifolia Smilax sebeana
So standishii Solanum carolinense
Solanum dulcamara Solanum jasminoides
Solanum jasminoides 'Variegata' Solanum laciniatum
Solanum quitoense Solanum wendlandii
Solenostemon x 'Kaleidoscope' Solenostemon x 'Pineapple Queen'
Solenostemon x 'Under the Sea™ Molten Coral' Solenostemon scutellarioides
Solenostemon scutellarioides 'Astatula' Solenostemon scutellarioides 'ColorBlaze® Dipt in Wine'
Solenostemon scutellarioides 'Gay's Delight' Solenostemon scutellarioides 'Gold Compacta'
Solenostemon scutellarioides 'Henna' Solenostemon scutellarioides 'India Frills'
Solenostemon scutellarioides 'King Scarlet' Solenostemon scutellarioides 'Kong Rose'
Solenostemon scutellarioides 'Mars' Solenostemon scutellarioides 'Micawpy'
Solenostemon scutellarioides 'Trailing Plum' Solenostemon scutellarioides 'Victoria Ruffles'
Solenostemon scutellarioides 'Wizard™ Golden' Solenostemon scutellarioides 'Wizard™ Jade'
Solenostemon scutellarioides 'Wizard™ Mix' Solidago x 'Dansolitlem (Little Lemon)'
Solidago x 'Gold Baby' Solidago canadensis
Solidago canadensis 'Crown of Rays' Solidago cutleri 'Goldrush'
Solidago rigida Solidago rugosa 'Fireworks'
Solidago spathulata 'Golden Fleece' Sorghastrum nutans 'Indian Steel'
Sorghum halapense Sparaxis elegans
Sparaxis tricolor Sparganium androcladum
Spartina alternifolia Spartina bakeri
Spartina pectinata 'Aureo-marginata' Spathiphyllum x
Spathiphyllum x 'Sensation' Spathiphyllum x 'Supreme'
Spathiphyllum x 'Taylor's Green' Spathiphyllum wallisii 'Clevelandii'
Sphaeralcea ambigua Sphaeralcea munroana
Spigelia marilandica Spiranthes cernua var. odorata
Spiranthes odorata 'Chadds Ford' Spodiopogon sibiricus
Sporobolus capillaris Sporobolus heterolepis
Sporobolus lindheimeri Sprekelia formosissima 'Superba'
Stachys albens Stachys albotomentosa
Stachys byzantina Stachys byzantina 'Big Ears'
Stachys byzantina 'Helen von Stein' Stachys byzantina 'Silver Carpet'
Stachys macrantha 'Robusta' Stachys monnieri 'Hummelo'
Stachys officinalis Stachys officinalis 'Grandiflora'
Stachys palustris