Poppy, 



Toppy Family, 



Populus, 



Portulaca, 



Portulacacefe, 



Potato, 



Potentilla, 147, 



Poterium, 



Prickly-Ash, 



Prickly-Pear, 



Prickly-Poppy, 



Primrose, 



Primrose Family, 



Primula, 



Primulacese, 



Prince's-Feather, 



Prince's-Pine, 



Prinos, 



Prunus, 146, 



Psoralea, 



Ptelea, 



Puccoon, 



Pulse Family, 



Pumpkin, ' 



Purslane, 



Purslane Family, 



Pycnanthemum, 



Pyrola, 



Pyrola Family, 



Pyrus, ' 147, 



Quamoclit, 



Quercus, 



Quince, 147, 



Kadish, 



Kamsted, 



Ranunculacere, 



Ranunculus, 113, 



Raphanus, 



Raspberry, 



Rattlebox, 



Red-Bay, 



Red-bud, 



Red-Cedar, 



Reseda, 



Resedacese, 



Rhamnacese, 



Rhamnus, 



Rheum, 



Rhododendron, 



Rhodora, 



Rhubarb, 



Rhus, 



Ribes, 



Rib-Grass, 



Rice, 



Robinia, 



Rock-Cress, 



