450 
Polypogon 43 
Pomaceae 221 
Pond-lily 16] 
Pond-weed 31332533 
Pond-weed Family 31 
Pontederiaceae 90 
Ponvy-grass 46 
Poor-man’s W eather-glass 
303 
Pop-corn Flower 326 
Poplar 122 
Poppy 174, 175 
Poppy Family he73 
Pop-soda Plant 416 
Populus 122 
Port Orford Cedar ZT 
Portulaca 151 
Portulacaceae . 148 
Potamogeton Bz 
Potato Family 339 
Potentilla 
Zt (24 5) 257.) 
Poterium (218) 
Poverty-grass 44 
Poverty-weed 397 
Powder-horn 157 
Prairie Clover 234 
Prenanthes 429 
Prickly Lettuce 426 
Primrose 265, 266, 301 
Primrose Family . 300 
Primula 301 
Primulaceae 300 
Prosartes 108 
Prunella 335 
Prunus 223 
Pseudocymopterus 285 
Pseudotsuga 28 
Psilocarphus 392 
Psoralea 234 
Pterospora 293 
Pterostegia 131 
Pteryxia 283 
Ptilocalais 423 
Ptilonella 402 
Puloria 424 
Puccinellia 62 
Pulsatilla 167 
Purple Marsh-locks 215 
Purple Mustard 179 
Purple-root 150 
Purple Star-grass 112 
Purshia 219 
Index 
Purslane 151, 26] 
Purslane Family 148 
Pyramid-bush 209 
Pyrola ae 
Pyrolaceae 29 
Pyrrocoma (380), eel 
Pyrrocomae 
Pyrus mt 
Quaking-grass OL 
Quamasia 105 
Quercus 125 
Rabbit-brush 382 
Rabbit-foot Clover Z31 
Rabbit’ s-tail 76 
Radicula 184 
Radish 184 
Rafinesquia 424 
Ragweed 398 
Rag-wort 414-417 
Raillardella 412 
Rainiera 414 
Ramona 336 
Ranunculaceae 162 
Ranunculus 169 
Raphanus 184 
Rapuntia 37] 
Raspberry 219, 220 
Rat-tail Fescue 63 
Rattle-snake Plantain 115 
Rattlesnake-root 429 
Rattle-weed 234 
Razoumofskya 129 
Red Clover 231 
Red Maids 149 
Red-osier Dogwood 290 
Red-root 250 
Red-top 48, 49, 61 
Redwood ay. 
Reed 45, 46, 54 
Reed-grass ~ 45, 46 
Reticulatae 12] 
Rhamnaceae 250 
Rhamnus 250 
Rhinantheae 354 
Rhinanthus 360 
Rhodiola (194) 
Rhododendron 296 
Rhus 247 
Rhynchospora 78 
Rhysopterus 284 
Ribes 204 
Ribesaceae 204 
Rice Tribe 39 
Rice-root 102, 103 
Rigiopappus 406 
Robinia 234 
Rock Cranberry 300 
Rock-cress 189, 190, 191 
Rock Pink 149 
Romanzoffhia 321 
Roripa 184 
Rosa 220 
Rosaceae 206 
Rose 220 
Rose Family 206 
Rosemary 297 
Rostratae 121 
Rotalia 259 
Rubiaceae 363 
Rubus 219 
Rudbeckia 399 
Rue 164, 171 
Rumex 134 
Ruppia 31 
Rush 90-93 
Rush Family 90 
Russian Thistle 145 
Rve 71 
Rve-grass 69 
Sage 143, 144, 410, 411 
Sagebrush 410 
Sagebrush Tribe 407. 
Sagina 157 
Sagittaria 55 
Salal 298 
Salicaceae th? 
Salicornia 144 
Salix 117 
Salsify 425 
Salsola 145 
Salt-grass 57 
Salt-horn 144 
Saltwort 303 
Sambucus 365 
Samolus 302 
Sandal-wood Family 128 
Sand-bur 398 
Sand-grass 49, 6l 
Sand-spurry 160 
Sand wort 158-161 
Sanguisorba 218 

