Sandwort, Thyme-leaved
Sarsaparilla, Bristly
Sarsaparilla, Wild
Saxifrage, Early
Serviceberry, Red-twigged
Serviceberry, Smooth
Serviceberry, Shadbush
Shepherd's Purse
Shinleaf
Showy Lady's Slipper
Silver Dollar
Skullcap, Mad-dog
Slender Ladies' Tresses
Smartweed, Nodding
Smartweed, Pennsylvania
Snakeroot, White
Snowberry
Solomon's Seal, False
Solomon's Seal, Smooth
Sorrel, Common Wood
Sorrel, Field or Sheep
Sorrel, Yellow Wood
Sow Thistle, Field
Sow Thistle, Spiny Leaved
Spearwort, Creeping
Spikenard
Spreading Dogbane
Spring Beauty
Speedwell, Common
Speedwell, Corn
Speedwell, Purslane
Speedwell, Thyme-leaved
Spurrey, Red Sand
Starflower
Steeplebush
St. Johnswort, Common
St. Johnswort, Marsh
Stonecrop, Mossy
Strawberry Blite
Strawberry, Barren
Strawberry, Common
Stitchwort, Lesser
Stickseed, European
Sundrops, Small
Sunflower, Common
Sunflower, Small Wood
Sunflower, Woodland
Swamp Candles
Swamp Shadbush
Swallow-wort, Pale
Sweet Cicely
Sweet Gale
Tansy, Common
Teaberry
Tea, Labrador
Tea, New Jersy
Tea, Oswego
Tearthumb, Arrow-leaved
Thimbleberry
Thimbleweed
Thistle, Bull
Thistle, Canada
Thistle, Field Sow
Tick Trefoil, Pointed-leaved
Toadflax, Bastard
Touch-me-not, Spotted
Trefoil, Birdsfoot
Trillium, Large-flowered
Trillium, Red
Trout Lily
Tumble Mustard
Turtlehead
Turtlehead, Lyon's (F)
Twisted Stalk, Rose (F)