538 



INDEX 



Parenchyma, 37, 58, 59, 91, 363, 389. 



Parmelia, 301. 



Parthenogenesis, 282. 



Partridge berry, 448. 



Pea family, 439. 



Pea leaf, 81 



Peach, 205, 209, 210, 437. 



Peach mummies, 294, 295. 



Peach, shoots of, 74. 



Peanuts, 439, 440. 



Pear, 213, 437. 



Pear, flower of, 148. 



Peat, 353. 



Peat mosses, 342, 352, 353. 



Peltandra, germinating pollen grains, 



200, 411. 

 Peltigera, 301. 

 Penicillium, 288, 289. 

 Pentamerous, 407. 

 Pepo, 213. 



Pepper, seed of, 202, 414, 415. 

 Perennial, 43, 68. 

 Perfect flowers, 145, 156. 

 Perfect stage, 288, 289, 291. 

 Perianth, 180, 406. 

 Pericarp, 13, 19, 205-207, 209. 

 Peri cycle, 36. 

 Perigynous, 147, 407, 419. 

 Perisperm, 202, 203, 415, 416. 

 Perithecium (a), 287, 290, 293. 

 Peronospora alsinearum, 284. 

 Peronospora calotheca, 283. 

 Peronospora schleideniana, 284. 

 Peru, 125. 

 Petals, 143, 152, 155, 158, 162, 164, 



168, 180. 

 Petiole, 77. 

 Peziza, 294. 

 Phaeophyceae, 228, 257. 

 Phallin, 326. 

 Philotria, 105. 

 Phloem, 37, 362. 

 Phoenix dactylifera, 429. 

 Phoradendron, flavescens, 136. 

 Phosphate rock, 126. 

 Phosphates, 125. 

 Phosphorus, 20, 114, 124, 125. 

 Photosynthesis, 97, 104-113, 123, 



272. 



Photosynthetic assimilation, 113. 

 Phragmidium violaceum, 312. 

 Phycoerythrin, 261. 

 Phycomyces nitens, 279. 

 Phycomycetes, 229, 273-286, 330. 



Phycophsein, 258. 



Phyllitis scolopendrium, 358. 



Phyllotaxy, 75. 



Phytogeny, 487. 



Physcia stellaris, 299, 300. 



Physical factors, 452. 



Phytomyxa leguminosarum, 128. 



Picea, 387. 



Pileus, 323. 



Pinales, 387. 



Pineapple, 431. 



Pineapple family, 431. 



Pine seed, 15. 



Pine seedling, 15, 16, in. 



Pinna, 80, 87, 88, 359. 



Pinnately veined leaves, 79. 



Pinus ponderosa, 459. 



Pinus sylvestris, 388. 



Piper nigrum, 202, 415. 



Pirus, 437. 



Pistil, 143, 152, 153, 156, 160, 163, 



165, 169, 171, 177, 181, 186, 190, 



192. 



Pistillate, 176, 179. 

 Pistillate cone, 187. 

 Pistillate cone of zamia, 399. 

 Pistillate inflorescence of corn, 175. 

 Pistils, movement of, 192-194. 

 Pitcher plant, 95. 

 Pith, 62. 



Placenta, 144, 145. 

 Placentation, 144. 

 Plains societies, 476. 

 Plankton, 256. 

 Plant breeding, principles of, 494- 



508. 



Plant cell, 3, 4. 



Plant food, sources of, 124-126. 

 Plant kingdom, i, 225, 228. 

 Plant, parts of, i, 2. 

 Plant societies, 469-484. 

 Plants, division of labor in, 2. 

 Plants, minute structure of, 2, 57- 



67, 89-91. ^ 



Plants, organization of, i. 

 Plants, winter habit of, 68. 

 Plasmolysis, 234, 235. 

 Plasmopora viticola, 282, 284. 

 Plastid, 272. 



Platycerium alcicorne, 368, 369. 

 Pleurococcus, 240, 251, 302. 

 Pleurococcus vulgaris, 240. 

 Plowrightia morbosa, 292, 293. 

 Plum family, 437. 



