120 



INDEX 



Silver Maple 59 Waler 35 



Weed 50 Smilacina 26 



Silver-leaved Poplar 29 Smilax 26 



Silvery Cinquefoil 50 Smooth Alder 

 Spleenwort 2 



Sinuate-leaved Even 

 ing Primrose 65 



Sisymbrium 46 



Sisyrinchium 27 

 Slum 68 

 Skullcap 77 



Mad-dog 77 



Marsh 77 



Small 77 

 Skunk Cabbage 23 

 Sleepy Catchfly 39 

 Slender Gerardia 79 



Ladies' Tresses 29 



Mountain Rice 14 



Muhlenbergia 14 



Nettle 34 



Rock Brake 2 



Rush 24 



Vetch 55 



Wheat Grass 9 



Wild Rye 12 



Willow 30 



Wood Reed Grass 11 

 Slippery Elm 34 

 Slough Grass 16 

 Small Bedstraw 82 



Bitter Cress 45 



Crab Grass 12 



Cranberry 71 



32 

 Rock Cress 44 

 Rose 52 

 Sumach 58 

 Yellow Violet 63 

 Smoother Sweet Cice- 

 ly 67 

 Snakehead 79 

 Snake-mouth 29 



Speedwell 80 

 Common 80 

 Corn 80 

 Marsh 80 

 Purslane 80 

 Thyme-leaved 

 Spergula 39 

 Sphenopholis 16 

 Spice Bush 43 

 Spike Rush 21 

 Spikenard 66 

 False 26 



80 



Snakeroot, Black 41, 67 Spinulose Shield Fern 1 



Clustered 67 



Large-fruited 67 



Seneca 57 



Short-styled 67 



White 88 

 Snowberry 83 



Creeping 69 



Garden 83 

 Soapberry Family 59 

 Soapwort 39 

 Solanaceae 78 

 Solanum 78 

 Solidago 91 

 Solomon's Seal 26 



False 26 



Small 26 



Star-flowered 26 



Three-leaved 26 



Two-leaved 25 

 Sonchus 92 

 Sorbaria 53 



Red Morning Glory 73Sorghastrum 16 

 Skullcap 77 Sorrel 36 



Common Wood 56 



Field 36 



Garden 36 



Lady's 56 



Sheep 36 



Wood 56 



Yellow Wood 56 

 Sour Gum 68 

 Sour-top Blueberry 70 

 Sow Thistle 92 

 Sparganiaceae 7 

 Sparganium 7 

 Spartina 16 

 Spatter Dock 40 

 Spear Grass 15 



Solomon's Seal 26 

 Sundrops 65 

 White Aster 87 

 Whorled Pogonia 29 

 Wood Orchis 28 

 Yellow Pond Lily 40 

 Smaller Enchanter's 

 Nightshade 64 

 Purple Fringed Or- 

 chis 28 

 Red-root 60 

 Yellow Lady's Slip- 

 per 27 

 Small-flowered Crow- 

 foot 42 

 Evening Primrose 65 Spearmint 76 

 Gerardia 79 Spearwort, Creeping 42Squirrel-tail Grass 13 



St. John's-wort 62 Speckled Alder 31 Stachys 77 



Smartweed, Common 35Specularia 84 Staff Tree 58 



Spiny-leaved Sow 



Thistle 92 

 Spiraea 53 



Ash-leaved 53 

 Spiranthes 29 

 Spirodela 23 

 Spleenwort 2 



Ebony 2 



Maidenhair 2 



Narrow-leaved 2 



Rue 2 



Silvery 2 

 Sporobolus 16 

 Spotted Cowbane 66 



Dead Nettle 76 



Medick 54 



Mint 76 



St. John's-wort 62 



Touch-me-not 60 

 Spreading Dogbane 72 

 Spring Beauty 40 



Broad-leaved 40 

 Spruce 6 



Black 6 



Bog 6 



Cat 6 



Red 7 



White 6 

 Spurge 57 



Cypress 57 



Family 57 



Flowering 57 

 Spurrey 39 



Corn 39 



Field 39 

 Squaw-weed 91 



Robbin's 91 



Round-leaved 91 

 Squirrel Corn 44 



