216 



INDEX 



Ptelea 82 



Pterospora 95 



Ptiloria 194 



Pycnanthemum 121 



Pyrola 94 



Pyrolaceae 94 



Quercus 157 



Radicula 61 



Ragweed 185 



Ranales 51 



Ranunculaceae 51 



Ranunculus 52, 53 



Raspberry 125 



Ratibida 181 



Red-bud 129 



Red cedar 5 



Redfieldia 34 



Red-root 152 



Red-top 43 



Reed 43 



Reseda 64 



Resedaceae 64 



Rhamnaceae 151 



Rhamnus 151 



Rhoeodales 57 



Rhus 155 



Ribes 142 



Robinia 133 



Roripa 61 



Rosa 126 



Rosaceae 123 



Rosales 122 



Rosin-weed 180 



Rotala 144 



Rubiaceae 163 



Rubiales 163 



Rubus 125 



Rudbeckia 180 



Ruellia 116 



Rumex 77 



Ruppia 9 



Rutaceae 82 



Rye. wild 36 



Sabina 6 



Sage 121 



Sage-brush 190 



Sagittaria 6 



Salicaceae 68 



Salicornia 75 



Salix 68 



Salomonia 12 



Salsify 194 



Salsola 75 



Salvia 120 



Sambucus 165 



Sand-bur 42 



Sand-lily 10 



Sanguinaria 57 



Sanguisorba 126 



Sanicula 160 



Santalaceae 153 



Sapindales 154 



Saponaria 66 



Sarcobatus 75 



Sarothra 87 



Saxifragaceae 142 



Scedonnardus 38 



Scheuchzeriaceae 7 



Scirpus 19 



Scolochloa 30 



Scutellaria 119 



Scrophularia Ill 



Scrophulariaceae 110 



Scrophulariales 110 



Sedges 17 



Sedum 142 



Senecio 190 



Senecioneae 190 



Setaria 41 



Shoe-strings 138 



Sicyos 151 



Sida 90 



Sideranthus 172 



Silene 65 



Silphium 180 



Sinapis 61 



Sisymbrium 60, 63 



Sisyrinchium 49 



Sitanion 36 



Slum 161 



Smilax 12 



Sneeze-weed 187 



Snowberry 165 



Solanaceae 104 



Solanum 105 



Solidago 173 



Solomon's seal 12 



Sonchus 194 



Sophia 63 



Sophora 131 



Sorghastrum 48 



Sour-dock 77 



Sow-thistle 194 



Sparganiaceae 16 



Sparganium 16 



Spartina 37 



Specularia 166 



Speedwell 113 



