INDEX 
Paraphyses, 220, *221. 
Parasites, 32, * 
Parasitic roots, 32, *38. 
Parietal placenta, *155, 
Parsnip root, study of, 87, 38. 
Pea seed, *8, 12, *13. 
Pea seedling, mutilated, 12, *13. 
Pear buds, #91. 
Pear fruit spurs, *! 
Pedicel, App., #265 
Peduncle, App., #265 
Peg of squash seedling, 23, 24. 
Peltate, App., *264. 
Pepo, 188. 
Perennial, 89, 54. 
Perfect, 149. 
Perianth, 148. 
Pericarp, 187. 
Perigynous, 155, *156. 
Petal, 143, 146, 148. 
Petiole, 98. 
Pheophyce, 210. 
Phanerogams, 209, 211. 
Phanerogams, classes of, 211. 
Phosphorus, 135. 
Phycomycetes, 210. 
Physiology, vegetable, 1. 
Pigeon-wheat moss, study of, 238- 
242*. 
Pileus, *228, 229. 
Pine, seedling, *28. 
Pinne, leaflets of a pinnately com- 
pound leaf, *105. 
Pinnate, #98, #99, #103. 
Pinnules, *244, 245. E 
Pistil, 143-145, 147, *148, *151, 
*153, 154. 
Pistil, parts of, #153. 
Pitcher-plant, #118, 120. 
Pith, *65, 66, 67, *68, *70, *71, *72. 
279 
Placenta, 154, *155. 
Plant societies, 113, 114. 
Plant society, 113. 
Plant physiology, definition of, 1. 
Plants, classes of, in relation to 
economy of water, 115-118*. 
Plants, destruction of, by animals, 
122. 
Plants of uneatable texture, 125. 
Pleurococcus, study of, 217, #218. 
Plunule, *5, #14. 
Pod, 183, 187, *194. 
Poisonous plants, 125, 126. 
Poisonous seeds, 21. 
Poisons, plants containing, 125, 126. 
Pollarded trees, 95. 
Pollen, 162-169*. 
Pollen-carrying 
*170. 
Pollen, discharge of, *162. 
Pollen grains, *1638. 
Pollen grains, number of, per ovule, 
167. 
Pollen, protection of, from visitors, 
73. 
Pollen tubes, 163, 164, #165. 
Pollination, 168-180*. 
Polypetalous, 153. 
Polysepalous, 153. 
Polytrichum, 238-242*. 
Pome, 188. 
Poplar, leafy twig of, #97. 
Potato tuber, 59, #60, 83, 84. 
apparatus, 169, 
‘Prickle, #128, #124. 
Prickly leaves, *124. 
Primary root, *14, 30. 
Primrose, pollination in flowers of, 
#178. 
Procambium, *71. 
Propagation, by root, 42. 
