INDEX 



433 



Plant-associations, progressive, 



399- 



retrogressive, 399. 

 Plant-communities, 319, 320. 

 Plant-formations, 319. 

 Plant-societies, 233, 319, 352. 

 Plantago, 379, 380, 383. 

 Plantain, 105, 204, 205, 217. 



Broad-leaved, 379. 



Buck's-horn, 383. 



Hoary, 368, 370, 383. 



Narrow-leaved or Ribwort, 



369, 3 8 0- 



Water, 269, 371, 376. 

 Plasmatic membrane, 5 1 . 

 PI at anus, 304. 

 Plum, 119, 170, 217, 243, (Fig. 



166). 

 Plumule, 21, 23, 24, 28. 

 Poa, Reed, 371. 

 Pod of Bean, 19-20, (Fig. 6), 



216. 

 Pollard trees, 235, 277. 

 Pollen-flowers, 164, 170. 

 Pollen-grains, 16, 158, 162. 



germination of, 208-9, (Fig. 

 142). 

 Pollen-sacs, 16, 158. 

 Pollen-tubes, 208-9. 

 Pollination, 159, 203-6. 



cross-, 160-1, 164, 204. 



insect-, 161, 205. 



self-, 160-1, 164, 177, 179, 181, 

 186. 



wind-, 159-60, 202, 205. 

 Pollinia, 199. 

 Polygonatum, 266. 

 Polygonum, 378, 387. 

 Polypetalous, 16, 174. 

 Polypody, 344. 

 Polysepalous, 15. 

 Pome, 219. 

 Pomegranate, 219. 

 Ponds, vegetation of, 371-5, 



(Fig. 239). 

 Pond-weed, 223, 269, 371, 375. 

 Poor Man's Weather-glass {see 

 Scarlet Pimpernel), 153,378, 



379- 

 Poplar, 62, 116, 119, 160, 204, 

 205, 279, (Fig. 186), 294, 

 358. 

 Aspen, 279. 



1296 E e 



Poplar, Balsam, 279. 

 Black, 279. 

 Lombardy, 279. 

 White, 279. 

 Poppy, 155, 216, (Fig. 151), 223, 

 378. 

 Horned, 389. 

 Populus, 279. 

 Potamogeton, 269. 

 Potato, 128-9, (Fig- 83), 182, 



254. 

 Potentilla, 379, 380. 

 Poterium, 244, 368, 380. 

 Potometer, 93 (Fig. 56). 

 Prefoliation, 119. 

 Prickles, (Fig. 114), 339. 

 Primrose, 105, 176-7, (Fig. 121), 

 193, 205, 231, 233, 235, 249, 

 (Fig. 169), 263, 343, 350. 

 Evening, opening flowers of, 

 154, (Fig. 100). 

 Primula, 249, 380. 

 Primulaceae, 248-50. 

 Privet, 107-8, (Fig. 65), 149.313, 



314, (Fig. 205), 349, 353. 

 Protection : 



of bud, 158, 196. 

 of chlorophyll, 147-8. 

 of honey, 155, 171, 173, 176, 

 183, 186, 188, 197, 198, 313. 

 of leaves, 67, 106, 155, 344, 

 382, 384, (Fig. 248), 386, 

 390. 

 of plumule, 25, 33, 

 of pollen, 155. 

 of stem, 72, 390. 

 of stomata, 95. 

 Protective movements, 148- 



55- 

 Proteins, 246. 

 Proterandrous, 172, 204. 

 Proterogynous, 171, 204. 

 Protoplasm, 27, 48, 209. 

 Prunella, 380. 

 Prunus, 354. 



Psamma (=Ammophila), 384. 

 Pseudocarp, 219. 

 Pteris, 343. 

 Ptyalin, 86. 

 Pulmonaria, 250. 

 Pulses, 246. 

 Pyrola, 353. 

 Pyrus, 244, 298. 



