226 



INDEX 



Parasites, useful, 38, 39 

 Parasitic bacteria, 38 



fungi, 51 



roots, Fig. 72, p. 127 

 Parietal placentae, 184 

 Parted leaves, 159 

 Parthenocissus quinquefolia, Figs. 



72, 78, 81, pp. 127, 137, 141 

 Partridge berry, Figs. 79, 101, pp. 



138, 166 



Pasteurization of milk, 40 

 Pathogenic bacteria, 39 

 Pear, Fig. 126, p. 198 

 Pedicle, 63, 172, 177 

 Pedicularis canadensis, Fig. 94, p. 



158 



Peduncle, 172 

 Peltate, 154 



Pentamerous flowers, 123 

 Pentandrous flower, 182 

 Pepo, 196, 197 



Fig. 124, p. 195 

 Perennial, 85 



roots, 130 



stems, 139 

 Perfect flowers, 185 

 Perfoliate attachment of leaves, 



156 



Pericarp, 192 

 Perigynous flowers, 185 

 Peristome, 66 



teeth, 66 

 Persistent calyx, 178 



leaves, 169 



Fig. 100, p. 165 

 Personate corolla, 180 

 Petals, 109, 177, 178 

 Petiole, 151, 153, 154 



Figs. 88-90, 151-153 

 Peziza sp., Fig. 23, p. 55 

 PhaBOphycese, Fig. 5, p. 28 

 Phagocytes, 39 



Phaseolus vulgaris, Fig. 130, p. 202 

 PheUogen dells, 123 

 Phycocyanin, 26 

 Phycoeythrin, 32 

 Phycomycetes, 51 

 Phycophcein, 31 

 Phyllitis scolopendrium, Fig. 39, p. 



75 

 Physostigma venenosum, Fig. 133, 



p. 207 

 Piaropus crassipes, Figs. 72, 103, 



pp. 127, 168 



Picea abies, Fig. 131, p. 203 

 Pieris mariana, Fig. 109, p. 179 

 Pigweed, Fig. 92, p. 155 

 Pilocarpus microphyllus, Fig. 95, 



p. 160 

 Pine, white 197 



development of male gameto- 



phyte, 101 

 of sperms, 101 

 distribution of pollen, 101 

 fertilization, 103 

 Figs. 55-63, 90, 99, pp. 98-107, 



161, 164 



gametophyte, 106 

 habitat, 97 



morphology of sporophyte, 97 

 pollination, 101 

 reproduction, 97 

 seed formation, 105 

 germination, 106 

 sporophyte, 108 

 summary, 106 

 Pineapple, Fig. 127, p. 199 

 Pinnate type of leaves, 158 



Fig. 97, p. 162 

 Pinus rigida, Fig. 131, p. 203 

 strobus, 97 

 Figs. 55, 56, 96, 99, pp. 98, 99, 



161, 164 



Pistillate flowers, 185 

 Pistils, 177, 184 

 Pitch pine, Fig. 131, p. 203 

 Pitcher plant, Fig. 103, p. 168 

 Placenta, 112, 184 

 Plant groups, 21 



parasites, 38 

 Plantago lanceolata, Fig. 106, p. 



173 



major, Fig. 106, p. 173 

 Plantain, Fig. 106, p. 173 

 Plants, differentiation from ani- 

 mals, 19 



how they attract birds and in- 

 sects, 189 

 Platanus occidentalis, Figs. 84, 134, 



pp. 144, 212 

 Plumule, 106, 122, 208 

 Podophyllum peltatum, Figs. 75, 



76, 90, pp. 134, 135, 153 

 Pollen chamber, 100 

 grain, 101 

 sacs, 116 

 tube, 101, 116 

 Pollination, 123, 188 



