

Orchard-grass 
Orchidaceae 
Orchid Family 
Orchis 13} 
Oreastrae 
Oreastrum 
Oregon Ash 
Oregon Grape 
Oreobroma 
Oreocarya 
Orobanchaceae 
Orobanche 
Orogenia 
Orthocarpus 
Oryzeae 
Oryzopsis 
Osmaronia 
Osmorhiza 
Ovary Plants 
Ovwl-clover 
Oxalidaceae 
Oxalis 
Ox-eve Daisy 
Oxybaphus 
Oxycoccus 
Oxypolis 
Oxyria 
Oxytheca 
Oxytropis 
Oyster Plant 
Pachistima 
Pachylophus 
Paeonia 
Paint-brush Tribe 
Panax 
Paniceae 
Panic-grass 
Panicum 
Papaver 
Papaveraceae 
Parietaria 
Parnassia 
Parnassus (Grass 
Parrya 
Parsley 
Parsnip 219; 
Partridge-foot 
Pasania 
Paspalum 
Pasque Flower 
a7 
112 
Tz 
114, 116 
384 
(384) 
305 
U7 
151 
327 
360 
361 
Lit 
oor 
39 
42 
223 
276 
aneoo 
BOI. 0a 98 
243° 
243 
409 
146 
300 
285 
136 
131 
239 
425 
248 
266 
163 
354 
27) 
37 
38 
38 
174 
173 
128 
203 
203 
19] 
282 
289 
209 
125 
38 
167 
of) 
276, 
282, 
Index 
Pastinaca 289 
Pea 241, 242 
Peach Family 223 
Pear 0) 
Pearlwort 157/158 
Pearly Everlasting 393 
Pectocarya 323 
Pedicularis 359 
Pellitory 128 
Peltiphyllym 199 
Penny-cress 182 
Pennywort 274 
Penstemon 346 
Pentacaena 16] 
Pentandrae 118 
Peony 163 
Pepper 138 
Pepper-grass 181, 182 
Peppermint 338 
Peramium L¥5 
Peraphyllum LLL 
Persicaria 138 
Petalostemon 234 
Petalostemum 234 
Petasites 412 
Petradora 383) 
Petradorae 382 
Petrophyton 209 
Petrophytum 209 
Peucedanum 286, (289) 
Phaca 234 
Phacelia Fg 
Phaeostoma (264) 
Phalareae 39 
Phalaris 39 
Phellopteris 283 
Philadelphus 203 
Philotria 36 
Phleum 49 
Phlox SEE 
Phlox Family 311 
Phoradendron 129 
Phragmites 54 
Phylicifoliae 121 
Phyllodoce 297 
Phyllospadix’ 33 
Physalis 339 
Physaria 186 
Physocarpus 208 
Physostegia 335 
Phytolacca 147 
Phytolaccaceae 147 
Picea 28 
449 
Pickerel-weed Family 90 
Pigeon-root 150 
Pigmy-weed 193 
Pigweed 145, 146 
Pigweed Family 145 
Pimpernel 352 
Pimpinella (281) 
Pinaceae 25 
Pine 29 
Pineapple-weed 408 
Pine-drops 293 
Pine Family 25 
Pine-sap 293 
Pinguicula 362 
Pinguiculaceae 361 
Pink 149, 154-156 
Pinus 29 
Piperia L43 
Pipsissewa 291 
Piptocalyx 326 
Piscaria 245 
Pitcher-plant 192 
Pitcher-plant Family 192 
Plagiobothrys 326 
Plains Mustard 183 
Plantaginaceae 362 
Plantago 362 
Plantain 362 
Plantain Family 362 
Platycarpos 226 
Platyspermum 186 
Platystemon 174 
Platystigma 174 
Plectritis 367 
Pleuricospora 294 
Pleuropogon 57 
Plum Lag 
Plumbaginaceae 304 
Pneumaria (329) 
Poa P| 
Poaceae 36 
Pogogyne 337 
Poison Ivy 247 
Poison Oak 248 
Poke-berry 147 
Pokeweed Family 147 
Polanisia 192 
Polemoniaceae 311 
Polemonium 316 
Polygala 244 
Polygalaceae 244 
Polygonaceae 130 
Polygonum 136 
