442 



INDEX. 



Pennyroyal, 299 

 Pencil Tree, 366 

 Pentstemon, 306 

 Pepper-grass, 151 

 Peramium, 89 

 Peraphyllum, 192 

 Pericome, 376 

 Peritoma, 168 

 Persicaria, ill 

 PetalostemoUj 215 

 Petasites, 387 

 Peteria, 202 

 Petradoria, 349 

 Peucedannnij 256 

 Phaca, 205-210 

 Phacelia, 282 

 Phacopsis, 206 

 PhalaridEjE, 22 

 Phalaris, 22 

 Phegopteris, -^ 

 Phellopterus, 254 

 Philadelphus, 176 

 Phileosera, 381 

 Philotriaj 15 

 Phippsia, 28 

 Phleum, 28 

 Phlox, 274 

 Phlox, 274 

 Phlox Family, 274 

 Phoradendron, 100 

 Phragmites, 37 

 Phyla, 294 

 Phyllodoce, 260 

 Physalis, 300 

 Physaria, 154 

 Physocarpiis, 1 79 

 Physostegia, 297 

 Pic^o, 8 



Pickerell-weed Family, 75 

 Picradenia, 380 

 Picradeniopsis , 377 

 Picrothamnus, 382 

 Pigmy-weed, 169 

 Pig- weed, 114, 120 

 Pinace;e, 7 

 Finales, 7 

 Pine Drop, 258 

 Pine Family, 7 

 Pines, 7, 8 



PlNGUICULACE^ffi, 319 



Pink Family, 132 

 Pinons, 8 

 Pinus, 7, 8 

 Piperia, 88 

 Pipsissewa, 258 

 Piptocalyx, 286 

 Plantaginace^, 320 

 Plantaginales, 320 

 Plantago, 320 

 Plantain, 320 



Plantain, Rattlesnake, 89 

 Plantain Family, 320 

 Platyschkuhria, 377 

 Pleurogyne, 267 

 Pluchea, 367 

 Plum Family, 193 

 Plums, 193 

 Poa, 40, 50 

 PoACE^, 15 



POALES, 15 

 PODALYRIE^, 195 



Poison Camass, 77 

 Poison Ivy, 225 

 Poison Oak, 225 

 Poinsettia, 225 

 Polanisia, 168 



POLEMONIACE^, 274 

 POLEMONIALES, 27I 



Polemonium, 280 

 Poliomintha, 298 

 Poly gala, 221 



POLYGALACEvE, 221 

 POLYGALALES, 221 

 POLYGONACE^, 1 01 

 POLYGONALES, lOI 



Polygonatum, 85 

 Polygonum, 109, 111-113 

 Polypappus, 367 



POLYPODIACEJE, I 



Polypodiwn, 2 

 Polypody, 2 

 Polypogon, 30 

 Polypteris, 377 

 Polystichum, 2 

 Pome Blanche, 213 

 Pond-weed, 12 

 Pond-weed Family, 12 



PONTEDERIACE^S, 75 



Poplar, 91 

 Poppy, 148 



Poppy, Prickly, 148 

 Poppy Family, 148 

 Poppy Mallow, 229 

 Populus, 91 

 Porcupine Grass, 23 

 Portulaca, 126 

 PortulacacejE, 125 

 Potamogeton, 12 

 Potato, 302 

 Potatoe, Hogs', 77 

 Potentilla, 180, 186, 187 

 Poverty Grass, 23, 29 

 Powder-horn, 128 

 Prairie Bean (Thermopsis') 

 Prairie Clover, 215 

 Prairie-grass, 38 

 Prairie Mimosa, 194 

 Prenanthella, 404 

 Prenanthes, 404 

 Prickly Pear, 238 



