Phytolacca 



66 



Picea 



106 



Pickerel-weed 



83 



Pigeon Berry 



66 



Pig-Nut 



70 



Pigweed 



85 



Amaranth 



65 



Pilea 



69 



Pimpernel, False 



60 



Pine 



105 



Pinesap 



54 



Pine- weed 



13 



Pink 



11 



Wild 



11 



Pinus 



105 



Pinweed 



10 



Pipewort 



S7 



Pipsissewa 



53 



Pitcher-plant 



7 



Plantago 

 Plantain 



64 



64 



Rattlesnake 



78 



Robin's 



43 



Water 



86 



Plantanus 



70 



Plectonema 



127 



Plowrightia 



136 



Plum 



23 



Poa 



103 



Pogonatum 



121 



Pogonia 



78 



Poison Ivy 



18 



Poke, Common 



66 



Indian 



83 



Pokewced 



66 



Polygala 



IS 



Polygonatum 



81 



Polygonum 



66 



Polypodium 



109 



Polypody 



109 



Polyporus 



138 



Polytrichum 



121 



Pond-lily, Yellow 



6 



Pondweed 



87 



Pontederia 



83 



Poplar 



76 



Popuhis 



76 



Portulaca 



12 



Potamogeton 

 Potentilla 



87 



25 



Pottia 



118 



Rrenanthes 



48 



Prickly Ash 



15 



Primrose, Evening 



32 



Prince's Pine 



53 



Privet 



56 



Proserpinaca 



30 



Prunus 



23 



Pteris 



109 



Puccinia 



138 



Purslane 



12 



Water 



31 



Pusley 



12 



Pycnanthemum 



63 



Pylaisia 



123 



Pyrola 



54 



One-flowered 



54 



Pyrus 



27 



Quaker Ladies 



36 



Quercus 



73 



Sedge 



140 



90 



Quillwort 



114 



Sedum 



29 



Quince 



27 



Selaginella 

 Self-heal 



114 







64 



Racomitrium 



119 



Senecio 



46 



Radish 



9 



Sericocarpus 



41 



Ragweed 



44 



Service Berry 

 Setaria 



28 



Ragwort, Golden 



46 



98 



Ranunculus 



4 



Shadbush 



28 



Raphanus 



9 



Sheep's Fescue 



104 



Raspberry 



24 



Shepherd's Purse 



9 



Rattlesnake-root 



48 



Shinleaf 



54 



8 

 7 



Rattlesnake-weed 



48 



Sickle-pod 



Red Top 



101 



Side-saddle Flower 



False 



103 



Silene 



11 



Reseda 



9 



Sisymbrium 



8 



Rhamnus 



16 



Sisyrinchium 



79 



Rhexia 



31 



Sium 



33 



64 



Rhododendron 



53 



Skullcap 



Rhodora 



53 



Skunk Cabbage 



85 



Rhus 



18 



Smartweed, Common 



67 



Rhynchospora 



90 



Smilaclna 



81 



Rhytisma 



137 



Smilax 



SO 



Ribes 



29 



Snake-head 



59 



Ribgrass 



64 



Snakeroot, Black 



34 



Rice, Mountain 



100 



White 



39 

 45 



Richweed 



69 



Sneezewort 



Rinodma 



134 



Soapwort 



11 



Robinia 



20 



Solarium 



59 

 39 

 81 



Rocket, Yellow 



8 



Solidago 



Rock-Rose 



9 



Solomon's Seal 



Rcestelia 



138 



Dwarf 



81 

 81 

 49 

 66 

 66 



Roman Wormwood 



44 



False 



Rosa 



26 



Sonchus 



Rose 



26 



Sorrel 



Rose Bay 



53 



Field 



Rubus 



24 



Wood 



15 

 35 



Rudbeckia 



44 



Sour-gum Tree 



Rue-Anemone 

 Rue, Goat's 



4 



20 



Spanish Bayonet 

 Sparganium 



81 

 85 



Meadow 



4 



Spatter Dock 



6 



Rumex 



60 



Specularia 



50 



Rush 



83 



Speedwell 



60 



Beak 



90 



Sphagnum 



115 



Club 



89 



Spice Bush 



68 



Scouring 



108 



Spikenard 



34 



Spike 



88 



False 



81 



Wood 



84 



Spirrca 



23 



Rye, Wild 



105 



Spiranthes 



7S 







Spirodela 



86 



Sagittaria 



86 



Spirogyra 



129 



Salix 



75 



Spleenwort 



109 



Sambucus 



35 



Sporobolus 



101 



Sand-Spurrey 



12 



Spruce 



106 



Sandwort 



12 



Spurge 



6S 



Sanguinaria 



7 



Squaw-root 



61 



Sanicula 



34 



Stachys 



64 



Saponaria 



11 



Staff-tree 



16 



Sarracenia 



7 



Star-flower 



54 



Sarsaparilla, Wild 



34 



Star-of -Bethlehem 



80 



Sassafras 



68 



Starwort 



12 



Savin 



107 



Water 



30 



Saxifraga 



28 



Steeple Bush 



23 



Saxifrage 



28 



Steironema 



54 



Golden 



28 



Stellaria 



12 



Schizophyllum 



138 



Stereocaulon 



134 



Schizothrix 



126 



Sticta 



134 



Scirpus 



89 



Stigeoclonium 



131 



Scleran thus 



65 



Stigonema 



12S 



Scutellaria 



64 



Stipa 



99 



