Rudbeckia fulgida var. speciosa 'Newmanii' Rudbeckia fulgida var. speciosa 'Viette's Little Suzy'
Rudbeckia fulgida var. sullivantii 'Goldsturm' Rudbeckia hirta
Rudbeckia hirta 'Autumn Forest' Rudbeckia hirta 'Becky'
Rudbeckia hirta 'Double Gold' Rudbeckia hirta 'Goldilocks'
Rudbeckia hirta 'Indian Summer' Rudbeckia hirta 'Irish Eyes'
Rudbeckia hirta 'Sonora' Rudbeckia hirta 'Toto®'
Rudbeckia laciniata Rudbeckia laciniata 'Goldquelle'
Rudbeckia maxima Rudbeckia missouriensis
Rudbeckia nitida 'Herbstsonne' Rudbeckia subtomentosa 'Henry Eilers'
Rudbeckia triloba Ruellia californica
Ruellia caroliniensis Ruellia nudiflora
Ruellia tweediana Ruellia tweediana 'Chi Chi'
Ruellia tweediana 'Katie Pink' Ruellia tweediana 'Purple Showers'
Russelia equisetiformis Sabal bermudana
Sabal blackburniana Sabal causiarum
Sabal mexicana Sabal minor
Sabal palmetto Sabal rosei
Sabal uresana Sabatia kennedyana
Sagittaria latifolia Sagittaria ssp.
Salix caroliniana Salix discolor
Salix gooddingii Salix myrtilloides
Salix nigra Salvia apiana
Salvia clevelandii Salvia coccinea
Salvia coccinea 'Lady in Red' Salvia columbariae
Salvia elegans Salvia farinacea
Salvia farinacea 'Argent' Salvia farinacea 'Strata'
Salvia farinacea 'Victoria Blue' Salvia greggii
Salvia greggii 'Moonlight' Salvia greggii 'Purple'
Salvia greggii 'Raspberry Ripple' Salvia greggii 'Red'
Salvia greggii 'Sierra San Antonio' Salvia involucrata
Salvia leucantha Salvia lyrata 'Burgundy Bliss'
Salvia lyrata 'Purple Knockout' Salvia munzii
Salvia patens 'Cambridge Blue' Salvia sinaloensis
Salvia spathacea Salvia verticillata
Salvia verticillata 'Alba' Sambucus caerulea
Sambucus canadensis Sambucus canadensis 'Aurea'
Sambucus canadensis 'Johns' Sambucus mexicana
Samolus parviflorus Sanguinaria canadensis
Sanguinaria canadensis 'Multiplex' Sanvitalia procumbens
Sanvitalia procumbens 'Irish Eyes' Sanvitalia procumbens 'Mandarin Orange'
Sapindus drumondii Sapindus saponaria
Sarcodes sanguinea Sarracenia flava
Sarracenia flava 'Peaches & Green' Sarracenia leucophylla
Sarracenia purpurea Sassafras albidum
Saururus cernuus Savia bahamensis
Saxifraga davurica Saxifraga paniculata
Scaevola plumieri Schaefferia frutescens
Schefflera actinophylla Schefflera actinophylla 'Amate™'
Schizachyrium scoparium Schizachyrium scoparium 'The Blues'
Schoenoplectus lacustris 'Albescens' Schoenoplectus lacustris ssp. tabernaemontani 'Zebrinus'