Onosmodium 
Ophioglossum 
Opulaster 
Opuntia 
Orache 
Orchidaceze 
Orchidales 
Orchis 
Oregon-grapes 
Oreocarya 
Orobanchacez 
Orobanche 
Orophaca 
Orthocarpus 
Oryzez 
Oryzopsis 
Osmorrhiza 
Osmunda 
Ostrya 
Othake 
Oxalidacez 
Oxalis 
Ox-eye 
Oxybaphus 
Oxygraphis 
Oyxtropis 
Oyster-plant 
Pachylophus 
Painted-cup 
Panax 
Panicesz 
Panicularia 
Panicum 
Papaveracesz 
Papaverales 
Papilionacez 
Parietaria 
Paronychia 
Parosela 
Parsnip 
Parthenocissus 
Partridge pea 
Paspalum 
Pasque flower 
Pastinaca 
Pawpaw 
Pea 
Peanut, wild 
Pectis 
Pedicularis 
Pellza 
Pellitory 
Pennyroyal 
Penthorum 
Pentstemon 
Pepo 
Pepper-grass 
Peppermint 
Petalostemum 
Petunia 
Phaca 
Phacelia 
Phalaridez 
Phalaris 
Phellopterus 
Philotria 
Phleum 
Phlox 
Phragmites 
Phryma 
Phrymacez 
146, 
INDEX 
Physalis 
Physaria 
Physostegia 
Phytolacca 
Phytolaccaceze 
Picradenia 
Picradeniopsis 
Pig-weed 
Pilea 
Pile-wort 
Pimpernel 
Pine 
Pine-drops 
Pinoidez 
Pinus 
Pin-weed 
Pirola see Pyrola 
Plane tree 
Plantaginacez 
Plantago 
Plantain 
Platanaceze 
Platanus 
Plum 
Poa 
Poaceze 
Poales 
Podophyllum 
Poison ivy 
Pokeberry 
Polanisia 
Polemoniaceze 
Polemoniales 
Polygala 
Polygalacez 
Polygonacez 
Polygonatum 
Polygonum 
Polypogon 
Polypteris 
Polytznia 
Pond-lily 
Pondv-eed 
Pontederiacez 
Poplar 
Poppy 
Populus 
Portulaca 
Portulacaceze 
Potamogeton 
Potamogetonaceze 
Potentilla 
Prenanthes 
Prickly-ash 
Prickly-pear 
Primrose 
Primulacez 
Primulales 
Prunella 
Prunus 
Psedera 
Psoralea 
Ptelea 
Pterospora 
_ Ptiloria 
Puccinellia 
Puecoon 
Pulsatilla 
Purslane 
Pyrola 
Pyrolaceze 
Quercus 
102, 
103, 
Radicula 
Ragweed 
Ranales 
Ranunculaceze 
Ranunculus 
Raspberry 
Ratibida 
Rattle-box 
Red-bud 
Red cedar 
Redfieldia 
Red-root 
Redtop 
Reed 
Reseda 
Resedaceze 
Rhamnacez 
Rhamnus 
Rhoeodales 
Rhus 
Ribes 
Rib-grass 
Rice, Indian 
Rice, mountain 
Ridan 
Robinia 
Rock-rose 
Roripa 
Rosa 
Rosacez 
Rosales 
Rose 
Rosin-weed 
Rotala 
Rubiaceze 
Rubiales 
Rubus 
Rudbeckia 
Rue-anemone 
Ruellia 
Rumex 
Ruppia 
Rush 
Russian thistle 
Rutaceze 
Rye, wild 
Sabina 
Sage 
Sage-brush 
Sagittaria 
Salicacez 
Salicornia 
Salix 
Salomonia 
Salsify 
Salsola 
Saltweed 
Salvia 
Sambucus 
Sand-bur 
Sand-lily 
Sandpuffs 
Sandvine 
Sanguinaria 
Sanguisorba 
Sanicula 
Santalacez 
Sapindales 
Saponaria 
Sarcobatus 
Sarothra 
Sarsaparilla 
