 Quercus coccinea (Scarlet Oak) |
 Quercus macrocarpa (Bur Oak) |
 Quercus montana (Chestnut Oak) |
 Quercus palustris (Pin Oak) |
 Quercus rubra (Red Oak) |
 Quercus velutina (Black Oak) |
 Rhamnus alnifolia (Alder-Leaved Buckthorn) |
 Rhododendron groenlandicum (Labrador-Tea) |
 Rhododendron maximum (Great Rhododendron) |
 Rhus copallinum (Winged Sumac) |
 Rhus glabra (Smooth Sumac) |
 Rhus typhina (Staghorn Sumac) |
 Ribes species (Currant) |
 Robinia pseudoacacia (Black Locust) |
 Rosa carolina (Carolina Rose) |
 Rosa palustris (Swamp Rose) |
 Rosa setigera (Prairie Rose) |
 Rubus allegheniensis (Common Blackberry) |
 Rubus hispidus (Bristly Dewberry) |
 Rubus idaeus (Red Raspberry) |
 Rubus occidentalis (Black Raspberry) |
 Rubus odoratus (Purple-Flowering Raspberry) |
 Rubus pubescens (Dwarf Raspberry) |
 Rumex britannica (Great Water Dock) |
 Sagittaria species (Arrowhead) |
 Sambucus canadensis (Black Elderberry) |
 Sambucus racemosa (Red Elderberry) |
 Sassafras albidum (Sassafras) |
 Scheuchzeria palustris (Pod-Grass) |
 Schizachyrium scoparium (Little Bluestem) |
 Scleria pauciflora (Few-Flowered Nutrush) |
 Scutellaria incana (Downy Skullcap) |
 Shepherdia canadensis (Canada Buffaloberry) |
 Sicyos angulatus (Bur-Cucumber) |
 Smilax species (Greenbriar) |
 Solanum caroliniense (Horse-Nettle) |
 Solidago species (Goldenrod) |
 Sparganium species (Bur-Reed) |
 Spiraea alba (Meadowsweet) |
 Spiraea tomentosa (Steeplebush) |
 Staphylea trifolia (Bladdernut) |
 Symphoricarpos albus (Snowberry) |
 Symphoricarpos orbiculatus (Coralberry) |
 Symplocarpus foetidus (Skunk Cabbage) |
 Thalictrum pubescens (Tall Meadow-Rue) |
 Tilia species (Basswood) |
 Toxicodendron radicans (Eastern Poison-Ivy) |
 Toxicodendron rydbergii (Western Poison-Ivy) |
 Toxicodendron vernix (Poison Sumac) |
 Triadenum species (Marsh St. Johnswort) |