Sneeze Weed, 128
Sneezewort, 131
Snowberry, 85, 111
Soapberry Family, 70
Soapwort, 34
Solanaceae, 100
Solanum, 100
Solidago, 125-127
Solomon's Seal, 11
Sorbaria, 57
Sorrel, Red, 25
Sorrel, Green, 25
Sorrel, Wood, 64
Sour Dock, 26
Sour Gum, 83
Southernwood, 119
Sparganiaceae, 2
Spartina, 5
Spear Grass, 7
Spearmint, 98
Spearwort, 36
Speckled Alder, 22
Specularia, 112
Speedwell, 105
Spergula, 32
Spergularia, 32
Spice Bush, 41
Spiderwort, 9
Spiderwort Family, 9
Spikenard, 80
Spike Rush, 7
Spiraea, 53
Spiranthes, 16
Spirodela, 9
Spotted Wintergreen, 85
Spurge, 67, 68
Spurge Family, 66
Spurred Gentian, 89
Spurrey, 32
Spring Avens, 56
Spring Beauty, 34
Spring Vetch, 59
Spruce, 1
Squashberry, 111
Squaw-root, 106
Squaw Weed, 128
Squirrel Corn, 41
Squirrel-tail, 4
Stachys, 99
Staff Tree Family, 69
Staphylea, 69
Staphyleaceae, 69
Star Flower, 87
Star Grass, 14
Star of Bethlehem, 14
Starry Campion, 33
Steironema, 88
Stellaria, 32, 33
Stemless Lady's Slipper, 18
Stickseed, 94
Stinging Nettle, 24
Stitchwort, 32
St. John's-wort, 73, 74
St. John's-wort Family, 73
Stone Clover, 61
Stonecrop, 48
Stonecrop, Ditch, 49
Stork's-bill, 64
Strawberry, 56
Strawberry, Barren, 55
Strawberry Blite, 29
Streptopus, 11
Striped Maple, 70
Strophostyles, 58
Stylophorum, 41
Sugar Maple, 70
Sumach, 68, 69
Summer Grape, 72
Summer Savory, 97
Sundew, 48
Sundew Family, 48
Sundrops, 78
Sunflower, 128-130
Sunflower, Tickseed, 124
Swamp Birch, 22
Swamp Currant, 49
Swamp Dewberry, 53
Swamp Laurel, 85
Swamp Milkweed, 91
Swamp Rose, 52
Swamp Valerian, 111
Swamp White Oak, 23
Sweet Birch, 22
Sweetbrier, 52
Sweet Cicely, 82
Sweet Fern, 20
Sweet Flag, 8
Sweet Gale, 21
Sweet Gale Family, 20
Sweet White Violet, 76
Sweet William, 34, 92
Sweet William Catchfly, 34
Sycamore, 51
Symphoricarpos, 110, 111
Symphytum, 93
Symplocarpus, 8
Synthyris, 102
Syringa, 88
Taenidia, 81
Tall Dock, 26
Tamarack, 1
Tanacetum, 119
Tansy, 119
Tansy Mustard, 43
Taraxacum, 115
Taxaceae, 2
Taxus, 2
Tear-thumb, 28
Teasel, 112
Teasel Family, 112
Tephrosia, 60
Teucrium, 97
Thalictrum, 39
Thaspium, 81
Thistle, 117, 118
Thistle, Canada, 118
Thistle, Cotton, 118
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