Page 



Slippery Elm 31 



Smaller Bladderwort 64 



Smaller Spearwort 36 



Small Alyssum 38 



Small Cranberry 57 



Small-Flowered Crowfoot.. 2>6 



Small Solomon's Seal 26 



Smartweed 32 



Smilacina 26 



Smilax 27 



Smooth Alder 30 



Smooth False Foxglove.... 63 



Smooth Gooseberry 41 



Smooth Sumach 49 



Smooth Sweet Cicely 54 



Smooth Yellow Violet 52 



Snakehead 63 



Snakeroot 37, 54, 67 



Sneezeweed 70 



Snowberry 65 



Soapberry Family SO 



Soapwort 35 



Soapwort Gentian 58 



Solanum 62 



SOLANACEAE 62 



Solidago 67 



Solomon's Seal 26 



Sonchus 72 



Sorbaria 42 



Sorghastrum 16 



Sorrel 32 



Sour Cherry 45 



Southernwood 70 



Sow Thistle 72 



Spanish Needles 70 



Sparganiaceae IS 



Sparganium 15 



Spatter Dock 35 



Spear Grass 19 



Spearmint 61 



Spearwort 36 



Speckled Alder 30 



Specularia 66 



Speedwell 63 



Spergula 34 



Spermatophyta 14 



Sphenopholis 18 



Spice Bush 38 



Spiderwort Family 24 



Spiked Loosestrife 53 



Spikenard 26, 54 



Spike Rush 20 



Spindle Tree 49 



Spiny-Leaved Sow-Thistle. . 72 



Spiraea 41 



Spiranthes 28 



Spirodela 24 



Spleenwort 11 



Sporobolus 18 



Spotted Cowbane 54 



Page 



Spotted Touch-me-not 50 



Spotted Wintergreen 56 



Spreading Dogbane 58 



Spreading Globe Flower.... 36 



Spreading Panicum 16 



Spring Beauty 35 



Spring Cress 39 



Spring Vetch 46 



Spruce 14 



Spurge 48 



Spurge Family 48 



Spurrey 34 



Squaw Root 64 



Squaw-Weed 71 



Squirrel Corn 38 



Squirrel-Tail Grass 20 



Stachys 61 



Staff Tree 49 



Staff Tree Family 49 



Staghorn Sumach 49 



Staphylea 49 



Staphvleaceae 49 



Star Cucumber 66 



Star Flower 57 



Star Grass 27 



Star of Bethlehem 26 



Star Thistle 71 



Starry Campion 35 



Starwort 34 



Steeple Bush 41 



Steironema 57 



Stellaria 34 



Stemless Lady's Slipper 27 



Stenophyllus 20 



Stickseed 60 



Sticktight 70 



Stonecrop 40 



Stone-Root 42 



Storksbill 47 



Strawberry 43 



Strawberry Blite Z3 



Streptopus 26 



Striped Maple 49 



Sugar Maple 50 



Sumach 49 



Summer Grape 50 



Sundew 40 



Sundew Family 40 



Sundrops 53 



Sunflower 69 



Swamp Beggar-Ticks 70 



Swamp Buttercup 36 



Swamp Black Currant 41 



Swamp Blueberry 57 



Swamp Dock 32 



Swamp Honeysuckle 56 



Swamp Loosestrife 53 



Swamp Maple 50 



Swamp Milkweed 59 



Swamp White Oak 30 



86 



