134 



INDEX. 



Poly gala paucifolia 107 



Poly gala polygama 107 



Poly gala sanguinea 107 



POLYGONACEiE 115 



Polygonatum biflorum . . . 118 

 Polygonum amphibium.. . 115 



Polygonum arifolium 115 



Polygonum articulatum. . 115 



Polygonum aviculare 115 



Polygonum dumetorum... 116 

 Polygonum hydropiperoi- 



des 116 



Polygonum Pennsylvani- 



cum 115 



Polygonum Persicaria — 115 

 Polygonum sagittatum . . . 115 



Polygonum scandens 116 



Pondweed 119 



Pontederia cordata 119 



PONTEDERIACEiE 119 



Poplar, White 117 



Populus alba 117 



Populus balsamifera 117 



Populus dilatata 117 



Populus grandidentata . . . 117 



Populus tremuloides 117 



Portulaca oleracea 105 



PORTULACACE^E 105 



Potamogeton heterophyl- 



lus 119 



Potentilla argentea 108 



Potentilla Canadensis 108 



Potentilla Norvegica 108 



Praenanthes serpentaria. . Ill 



PRIMULACE^E 113 



Primrose, Common Even- 

 ing 109 



Primrose, Small Evening. 109 



Prunus Pennsylvanica . . . 107 



Prunus serotina 107 



Prunus Virginiana 107 



Purslane 105 



Pycnanthemum lanceola- 



turn 115 



Pyrus Americana 108 



Pyrus arbutifolia 108 



Pyrus melanocarpa 108 



Pyrus sambucifolia 108 



Pyrola, One-flowered 113 



Pyrola chlorantha 113 



Pyrola elliptica 113 



Pyrola rotundifolia 113 



Pyrola secunda 113 



Quercus alba 116 



Quercus coccinea 117 



Quercus ilicifolia 117 



Quercus prinoides. 117 



Quercus rubra 116 



Quercus tinctoria 117 



