224 



PAGE 



PORTULACACE^ 141 



Potamogeton 106 



Potato Family 190 



PONTEDERIACE^ 126 



Potentilla 154 



Powder-horu 142 



Prairie Clover 161 



Prairie Turnip 160 



Prenanthes 199 



Prickly Ash 167 



Prickly Pear 173 



Primrose Family. 18 r 



Prosartes 129 



PrimuIvACE^ 181 



Prunella 189 



Prunus 157 



Psoralea 160 



PTERIDOPAYTKS 103 



Pteris 104 



Pterospora 180 



Puccoon 187 



Purple-stemed Cliff-brake 104 



Purslane 141 



Pursley 141 



Pulsatilla 145 



Pyrola 180 



Pyroi^ace^ 180 



Pyrus 157 



Quack-grass 118 



Quamoclit 184 



Quercus 134 



Ragweed Family 200 



Ragworts 212 



Ranunculace^ 144 



Ranunculus 146 



Ratibida 208 



Rattle-box 159 



Rattlesnake Plantain 131 



Rattlesnake Root 199 



Rayless Goldenrod 202 



Red Ash 181 



Redbud 158 



Red Cedar 106 



Red Osier 179 



Red Raspberry. . . 154 



RedroDt 170 



Redtop 113 



P.\GE 



Reed Grass 113 



Rhamnace^ 170 



Rhus 169 



Ribes 153 



Rice Cut-Grass no 



Rock-cress 151 



Rock Maple 169 



Rocky Mountain Woodsia .... 103 



Rock-rose Family . 172 



Roripa 148 



Rosa 156 



Rosacea 153 



Rose Family 153 



Roses 156 



Rudbeckia 208 



RUBIACE^ 194 



Rubus 154 



Rue Family . . . . : 167 



Rumex 136 



Ruppia 107 



Rushes 126 



Rush -grass 112 



Russian Thistle 139 



RUTACE^ . 167 



Sage 189 



Sagebush 211 



Sagittaria 108 



Salicace^ X32 



Salicornia 139 



Salix 132 



Salmon-berry 154 



Salsify 19S 



Salsola 139 



Salvia 189 



Sambucus 195 



Sand Cherry 157 



Sand Burr no 



Sandwort 143 



Sanguinaria 147 



Sanicula 177 



Santalace^ 135 



Saponaria 141 



Sarsaparilla 177 



Savastana iii 



Saxifraga 152 



SaxifragacE^ 152 



Saxifrages 152 



