Plants with yellow or green flowers
 Rhus aromatica (Skunkbush) |
 Ribes americanum (Wild Black Currant) |
 Ribes aureum (Golden Currant) |
 Ribes triste (Swamp Red Currant) |
 Rorippa palustris (Marsh Yellow Cress) |
 Rudbeckia hirta (Black-eyed Susan) |
 Rumex acetosa (Sour Dock) |
 Rumex crispus (Curly Dock) |
 Rumex maritimus (Golden Dock) |
 Rumex occidentalis (Western Dock) |
 Rumex pseudonatronatus (Field Dock) |
 Rumex salicifolius (Narrow-Leaved Dock) |
 Rumex stenophyllus (Narrow-Leaved Field Dock) |
 Sedum lanceolatum (Lance-Leaved Stonecrop) |
 Senecio eremophilus (Cut-Leaved Ragwort) |
 Senecio integerrimus (Entire-Leaved Groundsel) |
 Senecio vulgaris (Common Groundsel) |
 Shepherdia argentea (Silver Buffaloberry) |
 Shepherdia canadensis (Canada Buffaloberry) |
 Silene drummondii (Drummond's Cockle) |
 Sinapis arvensis (Wild Mustard) |
 Sisymbrium altissimum (Tumbling Mustard) |
 Sisymbrium loeselii (Tall Hedge Mustard) |
 Smilax lasioneura (Carrionflower) |
 Solanum rostratum (Buffalo Bur) |
 Solidago altissima (Tall Goldenrod) |
 Solidago gigantea (Giant Goldenrod, Late Goldenrod) |
 Solidago hispida (Pale Goldenrod) |
 Solidago lepida (Western Goldenrod) |
 Solidago missouriensis (Low Goldenrod) |
 Solidago mollis (Velvety Goldenrod) |
 Solidago nemoralis (Gray Goldenrod) |
 Solidago rigida (Stiff Goldenrod) |
 Solidago simplex (Mountain Goldenrod) |
 Sonchus arvensis (Perennial Sow-Thistle) |
 Sonchus asper (Prickly Sow-Thistle) |
 Sonchus oleraceus (Annual Sow-Thistle) |
 Stellaria calycantha (Northern Stichwort) |
 Stenotus armerioides (Narrow-Leaved Stenotus) |
 Streptopus amplexifolius (Clasping-Leaved Twisted Stalk) |