37 § 
Piscidia Erythrina, 292 
Pistacia vera, 304 
lentiscus, 304 
Pistachio, 304 
Pistil dicarpellary 155 
monocarpellary, 134 
polycarpellary, 155 
tricarpellary, 155 
system, 154 
Pix Burgundica, 244 
Canadensis, 244 
Liquida, 244 
Placenta, defined, 156 
Placentation, 156 
Planococcus, 175 
Planosarcina, 175 
Plant, acaulescent, 98 
anemophilous, 158 
annual, 88 
biennial, 88 
caulescent, -97 
cell, 38 
dioecious, 142 
entomophilous, 158 
geography, 1 
hairs, 74, 75 
hydrophilous, 158 
indigenous, 1 
monoecious, 142 
naturalized, 2 
organs, 85-173 
perennial, 88 
tissues, 67 
zoophilous, 158 
Plantaginacere, placentation in, 156 
Plasma membranes, 39, 45 
Plasmodiocarp, 185 
Plasmodium, 184 
Plastids, 40 
Platystemon, 280 
Plectascales, 204 
Plerome, 67, 68 
Pleurococcaceae, 186 
Pleurococcus, 186 
Plum, 286 
INDEX 
Plumule, 85 
Podophyllum, 275 
peltatum, 275, 276 
Polemoniales, 334 
Pollen, 150, 151, 152, 153 
maturation of, 158, 159 
Pollination, 33, 34, 158 
Pollinia, 154 
Polyembryony, 37 
Polygala, 64 
lutea, 302 
senega, 302, 303 
Polygalaceae, 302 
Polygonaceae, 156, 269 
Polygonales, 269 
Polygonatum, 249 
Polygonum, 269 
Bistorta, 270 
Polypodiales, 241 
Polyporacese, 222 
Polyporus, enzyme in, 63 
officinalis, 223 
Polytrichum commune, 234, 235 
Pome, 165 
Pomegranate Family, 319 
Poplar, 261 
Poppy Family, 280 
Populi Gemrme, 261 
Populus balsamifera, 261 
nigrum, 261 
Pore Fungi, 222 
Porella, 232 
Potentilla, 144 
silvestris, 289 
Prefloration, 140, 141 
Prefoliation, 118 
Primulaceae, placentation in, 156 
Principes, 248 
Principles of classification, 2, 3 
Privet, 329 
Proembryo, 192 
Promycelium, 218 
Proportions of stamens, 148 
Protective tissues, 84 
Proteins, 19, 57, 58 
