Sidalcea x 'Party Girl' Sidalcea malviflora 'Elsie Heugh'
Sidalcea malviflora 'Little Princess' Silene armeria 'Electra'
Silene dioica 'Clifford Moor' Silene latifolia
Silene mexicana 'Hot Stuff' Silene polypetala
Silene uniflora Silene uniflora 'Druett's Variegated'
Silene uniflora 'Swan Lake' Silene virginica
Silphium gracile Silphium perfoliatum
Silybum marianum Sinapis arvensis
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 integrifolium
Solanum jasminoides Solanum jasminoides 'Variegata'
Solanum laciniatum Solanum melongena
Solanum nigrum Solanum pyracanthum
Solanum quitoense Solanum tuberosum 'Norland'
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
Spinacia oleracea 'Melody' Spiranthes cernua var. odorata
Spiranthes odorata 'Chadds Ford' Spodiopogon sibiricus
Sporobolus capillaris Sporobolus heterolepis
Sporobolus lindheimeri Sprekelia formosissima 'Superba'