155 



Showy Orchis 17 



Sicyos 112 



Sida 72, 73 



Silene 33,34 



Silphium 122, 123, 127 



Silver Maple 70 



Silver Weed 55 



Silvery Cinquefoil 66 



Silybum 117 



Simarubaceae 65 



Sium 81 



Sisymbrium 43~45> 47 



Sisyrinchium 15 



Skullcap 96 



Skunk Cabbage 8 



Skunk Currant 49 



Slender Nettle 24 



Slippery Elm 24 



Slough Grass 5 



Small-flowered Crowfoot 36 



Small- fruited Hickory 21 



Small Snapdragon 103 



Small Solomon's Seal 1 1 



Smartweed 27, 28 



Smilacina 14 



Smilax n 



Smooth Alder 22 



Snake Mouth 18 



Snakeroot, Black 82 



Snakeroot, Seneca 66 



Snakeroot, Virginia 25 



Snapdragon 103 



Sneezeweed 127 



Sneeze Weed 128 



Sneezewort 131 



Snowberry 85,111 



Soapberry Family 70 



Soapwort 34 



Solanaceae 100 



Solanum 100 



Solidago 125-127 



Solomon's Seal 1 1 



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 0,8" 



Spearwort 36 



Speckled Alder 22 



Specularia 112 



Speedwell . 105 



Spergula 32 



Spergularia 32 



Spice Bush 41 



Spiderwort 9 



Spiderwort Family . g 



Spikenard 80 



Spike Rush 7 



Spiraea 53 



Spiranthes 16- 



Spirodela g 



Spotted Wintergreen ,85 



Spurge 67, 68 



Spurge Family 66 



Spurred Gentian 89 



Spurrey 32 



Spring Avens 56 



Spring Beauty . . . . '. 34 



Spring Vetch 59 



Spruce i 



Squashberry 1 1 1 



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 Elite 29- 



