776 INDEX 
Perigone, 266 Phloem, secondary, 143 
appendages of, 274 Phloroglucin, solution of, 685 
Perisperm, 314 Phlox, corolla of, 272 
Peristome, 429 Phoradendron flavescens, 510 
Perithecia, 391, 395, 416 Photogens, 364 
Periwinkle, 258 Photosynthesis, 64, 66 
Peroxidase, 104 defined, 224 
Pertusaria, 414 Phototropism, 35 
Petals, 269 Phragmidiothrix, 372 
Petiole, 223, 242 Phragmites, 618 
gross structure and histology of, 242 Phycocyanin, 100, 334, 357 
Petiolule, 234 Phycoerythrin, 100, 335, 357 
Petroleum Ether, 685 Phycophain, 100 
Petroselini Radix, 577 Phycomycetes, 375, 376 
Petroselinum, 577 Phycophzin, 351, 352 
Petroselinum sativum, 577 Phycoxanthin, 351 
Petunia, 596 Phylloclades, 188 
Peumus Boldus, 522 Phyllode, 244 
Peyote, 568 Phyllotaxy, 229 
Peziza, 387 Physalis, 297 
repanda, Fig of, 386 Fig. of calyx, 267 
Pezizales, 387 Physica, 414 
Pfeffer, 33 Physica stellaris, Pig. of 413 
Phzophycez, 351 Physiological division of labor, 16 
Phzosporales, 352 Physiology, defined, 2 
Phalaris canariensis, 485 Physostigma, 539, 540 
Phallales, 411 style of, 289 
Phanerogamia, 325, 443 Physostigma venenosum, 640, 641 
Phanerogams, 14 Physostigmine: Salicylas, 540 
Pharmaceutical Botany, defined, 3 Phytogeography, defined, 3 
Pharmacognosy, defined, 3 Phytopalzontology, defined, 3 
Phaseolus lunatus, structure of seed of, 319 Phytoglobulins, 94 
Phaseolus multiflorus, cross-sections of Phytolacca, 514 
hooked hair from, 126 Phytolacca americana, 514, 515 
Phegopteris, 435 Phytolacca, N.F., 514 
Phellem, 207 Phytolaccacea, 514 
’ Phelloderm, defined, 208 Phytopalzontology, defined, 3 
Phellogen, 114, 129, 131 Phytopathology, defined, 3 
Phenotype, 647, 648 Picea, 465 
Philadelphus, 531 canadensis, 466 
Phloem, 140 excelsa, 466 
defined, 143 mariana, 466 
internal, 204 rubra, 466 
interxylary, 204 Pickerel weed, 116 
intraxylary, 204 Picrasma excelsa, 546, 647 
parenchyma, 117, 135 Picric acid, 39 
primary, 143 Pigments, 98 
ray, 139 Pigweed, pollen of, 283 
