 Samolus parviflorus (Pineland Pimpernel) |
 Sanguinaria canadensis (Bloodroot) |
 Sanguinaria canadensis (Bloodroot) - Large Cluster |
 Sanguisorba canadensis (Canadian Burnet) |
 Sanicula marilandica (Maryland Sanicle) |
 Sanicula odorata (Clustered Sanicle) |
 Sarracenia purpurea (Purple Pitcher-Plant) - Inside View |
 Sarracenia purpurea (Purple Pitcher-Plant) - Outside View |
 Sassafras albidum (Sassafras) |
 Saururus cernuus (Lizard's-Tail) |
 Schizachyrium scoparium (Little Bluestem) |
 Schoenoplectiella smithii (Smith's Bulrush) |
 Schoenoplectus acutus (Hard-Stemmed Bulrush) |
 Schoenoplectus pungens (Three-Square) |
 Schoenoplectus tabernaemontani (Soft-Stemmed Bulrush) |
 Scirpus atrovirens (Dark Green Bulrush) |
 Scirpus cyperinus (Wool Sedge) |
 Scirpus polyphyllus (Leafy Bulrush) |
 Scrophularia marilandica (Maryland Figwort) |
 Scutellaria galericulata (Common Skullcap) |
 Scutellaria incana (Downy Skullcap) |
 Scutellaria lateriflora (Mad-Dog Skullcap) |
 Scutellaria saxatilis (Rock Skullcap) |
 Sedum ternatum (Wild Stonecrop) |
 Senecio suaveolens (Sweet-Scented Indian-Plantain) |
 Senna hebecarpa (Wild Senna) |
 Setaria parviflora (Knotroot Foxtail) |
 Shepherdia canadensis (Canada Buffaloberry) |
 Sicyos angulatus (Bur-Cucumber) |
 Silene antirrhina (Sleepy Catchfly) |
 Silene caroliniana (Wild Pink) |
 Silene regia (Royal Catchfly) |
 Silene regia (Royal Catchfly) - Large Cluster |
 Silene rotundifolia (Round-Leaved Catchfly) |
 Silene stellata (Starry Campion) |
 Silene virginica (Fire Pink) |
 Silphium perfoliatum (Cup-Plant) |
 Silphium terebinthinaceum (Prairie Dock) |
 Silphium trifoliatum (Cup-Plant) |
 Sisyrinchium species (Blue-Eyed Grass) |
 Sium suave (Water-Parsnip) |
 Smilax herbacea (Carrion-Flower) |
 Smilax tamnoides (Bristly Greenbriar) |
 Solanum caroliniense (Horse-Nettle) |
 Solidago altissima (Tall Goldenrod) |
 Solidago arguta (Sharp-Leaved Goldenrod) |
 Solidago bicolor (Silverrod) |
 Solidago caesia (Blue-Stemmed Goldenrod) |
 Solidago flexicaulis (Zig-Zag Goldenrod) |
 Solidago gigantea (Late Goldenrod) |