MORPHOLOGICAL, STRUCTURAL, AND PHYSIOLOGICAL BOTANY. 875 
Organs of nutrition, 13, 73, 
790 
— — reproduction, 14, 15, 
190, 240, 826 
— — vegetation, 13, 765 
Origin of placenta, 284 
— — stomata, 788 
Original cell formation, 
772 
Orthotropous, 330, 333 
Oscillatoria, 6 
Osmose, 781 
Ostiole, 389 
Outer bark, 90 
Outline of leaves, 169 
Outside growers, 74 
Oval, 171, 249, 250 
— cell, 37 : 
— parenchyma, 47 
Ovary, 19, 267, 279 
— compound, 275, 279 
— simple, 279 
Ovate, 171, 231 
— -lanceolate, 173 
Ovulary spore, 370, 833 
Ovule, 19, 324 
Ovum-cell, 328 
PALMONTOLOGIC AL botany, 
9 
Palate, 236 
Palex, 197, 203 
Pales, 197, 203 
Palisade parenchyma, 145 
Palmate, 168, 178 
Palmated root, 137 
Palmately cleft, 168 
— veined, 160, 176 
Palmatifid, 167, 168 
Palmatipartite, 167 
Palmatisected, 167 
Panduriform, 167 
Panicle, 206 
Panicled corymb, 205 
— cyme, 213 
Papilionaceous, 233 
Papille, 69 
Pappose, 228 
Pappus, 228 
Parallel chorisis, 358 
— formation of leaves, 811 
— -veined, 159, 161 
— venation, 160, 162 
Paraphyses, 372, 383, 386, 
389, 396, 397 
Parasites, 132 
Parenchyma, 47 
— of leaves, 142, 144 
— varieties of, 47 
— functions of, 771 
Parenchymatous cells, 39 
— system, 57, 74, 90 
Parent cells, 258 
Parietal placenta, 282 
Paripinnate, 176 
Partial dehiscence, 316 
— involucre, 194, 209 
— petiole, 162, 180 
Partial umbel, 209 | 
Partite, 165, 225, 231, 233, 
289 
Partitions, 165, 275 
Parts of the anther, 244 
~—- — flower, 218 
— — — leaf, 141 
— — — stem, 794 
Patulous, 225, 232 
Pectinate, 167 , 
Pectine, 848 
Pectose, 849 
Pectosic acid, 848 
Pedate, 168, 178 
Pedatifid, 168 
Pedatipartite, 168 
Pedatisected, 168 
Pedicel, 16, 197 
Peduncle, 15, 197 
— duration of, 200 
Peloria, 238 
Peltate hairs, 65 
— leaves, 147 
— ovule, 326 
Pendulous, 116, 243, 326, 334 
Penicillium, 6 
Pentagonal, 354 
Pentamerous, 221, 354 
Pentapetalous, 232 
Pentasepalous, 225 
Pentastichous, 151, 221 
Pepo, 320 
Pepperworts, 370, 832 
Perennial herbs, 115 
-— leaves, 141 
— roots, 133 
Perfect fruit, 298 
Perfoliate, 148 
Perianth, 17, 223 
Periblem, 126 
Pericarp, 21, 298 
Perichretial, 372 
Periderm, 91 
Perigone, 372, 376 
Perigonial, 372 
Perigynous, 254, 266, 356 
Periodical movements, 860, 
864 
Peripheral, 377 
Peripherical, 346 
Perisperm, 340, 341 
Peristome, 374 
Perithecia, 385 
Permanent tissue, 88, 793 
Persistent, 141,183,193, 200, 
230, 240, 287 
Personate, 236 
Petaloid, 17, 223, 227, 242, 
289 
Petals, 17, 230, 350 
Petiolar stipules, 183 
Petiolate, 146 
Petiole, 15, 141, 143, 157, 179 
Petiolule, 162, 180 
Peziza, 385 
Phanerogamia, 12, 190 
Phanerogamous, 11, 190 
Phanerogams, 11 
Phelloderma, 90, 91 
Phellogen, 92 
Phloém, 76, 90, 794 
Phragmata, 277 
Phycocyan, 29 
Phycoerythrin, 28 
Phycomycetes, 378 
Phyllaries, 194 
Phyloclade, 199 
Phyllocyanin, 28 
Phyllode, 187 
Phylodia, 157 
Phylloid peduncle, 199 
Phyliome, 15, 140, 796 
Phyllotaxis, 148, 200 
— of natural orders, 154 
Phylloxanthein, 808 
Phylloxanthin, 28 ~ 
Physiological botany, 1, 770 
Physiology, 770 
— of the elementary struc- 
tures, 771 
—— — organs of nutrition, 
790 
—-—— reproduction, 
$26 
— — — root, 790 
Phytons, 106 
Pileorhiza, 
839 
Pileus, 381 
Pilose, 228 
Pilularia, 371 
Pinne, 175 
Pinnate, 175 
— with an 
176 
Pinnately-veined, 159, 174 
Pinnatifid, 166, 231 
Pinnatipartite, 166, 231 
Pinnatisected, 166 
Pinnules, 176 
Pistil, 19, 266, 272 
Pistillate, 20, 360 
Pistillidia, 372, 375, 831 
Pitchers, 188 
Pith, 79, 80 
— functions of, 794 
Pitted cellular tissue, 48 
— cells, 42, 48 
— tissue, 48 
— vessels, 51 
Placenta, 19, 267, 270, 281 
Placentation, 281 
Placentiferous, 306 
Placentiform root, 139 
Placentoid, 247 
Plant in action, 818 
Plants, odours of, 865 
Plaited, 155, 220 
Plasmodium, 2 
Plastids, 809 
Plerome, 126 
Plicate, 155, 220 
Plumose, 228 
Plumule, 12, 342, 343 
Pod, 310 
Podetium, 389 
Podium, 109 
Pollarded trees, 111 
126, 128, 792, 
odd leaflet, 
