432 



INDEX 



Ornithogalum, 266. 



Orthotropous, 208. 



Osier Willow, 235, 276-7. 



Osmic acid, 23. 



Osmometer, Potato, 52-3, (Fig. 



24). 

 Osmosis, 50-4. 

 Ovary, 17, 159. 

 Ovule, 17, 159, 206-8. 

 Oxalis, 1 50-1, (Fig. 99), 205. 

 Oxygen, necessity for, 43-5, 57. 



Pales, 201, (Fig. 138). 

 Palisade tissue, 66, (Fig. 29). 

 Palms, 264. 

 Pansy, 185-6, (Figs. 127-9). 



Corn, 186, 204, 206, 378. 



Field, 124. 

 Pap aver, 378. 

 Papilionaceae, 244-6, (Fig. 167), 



248. 

 Pappus, 180. 

 Parachute fruits, 221-2. 

 Parasites, 343, 358-61, (Figs. 



229-31). 

 Paris, Herb, 266, 353. 

 Parsley, 247. 



Beaked (see Chervil), 173, 380. 



Fool's, 247, 378. 



Hedge, 247. 



Piert, 378. 

 Parsnip, 246. 

 Passion-flower, 144, 147, (Fig. 



93). 



Pastures, 366-9. 



survey of, 369. 

 Pea, Edible or Garden, 21, 23, 

 27, 28, 87, 116, 190, 210, 

 216, 246. 



Meadow, 380. 

 Peanut, 246. 



Pear, 119, 171, 210, 219, 244. 

 Pearl wort, 239. 



Peat, 3I5-J7. ( p ig- 209), 391-5. 

 Pedicel, 15. 

 Pedicularis, 256. 

 Pelargonium, 74, 81, 82, 172. 

 Pelvetia, 381. 



Pennywort [Cotyledon), 344, (Fig. 

 221). 



Marsh, 247. 

 Pentamerous, 241. 

 Pentstemon, 256. 



Pepper, 210. 

 Peppermint, 252. 

 Perennation, 125. 

 Perennials, 125, 379, 380. 

 Perfoliate, 260. 

 Perianth, 194. 

 Pericarp, 18, 31. 

 Perigynous, 169, 170. 

 Perisperm, 210. 

 Persicaria, 378. 

 Petaloid, 164. 

 Petals, 16. 

 Petasites, 262. 

 Petioles, 12. 



mechanical structure of, 68. 

 modified, 147, (Figs. 92-6), 



152. 

 Petunia, 254. 

 Peucedanum, 246. 

 Phaseolus, 246. 

 Phleum, 386. 

 Phloem, 69. 

 Phormium, 266. 

 Photosynthesis, 79-80. 

 Phragmites, 371. 

 Phylloclade (or cladode), 147, 



(Fig. 96), 266, 372. 

 Phyllode, 147, (Fig. 96), 366. 

 Phyllotaxy, 14. 

 Physalis, 210, 254. 

 Pimpernel, Bog, 250. 



Scarlet, 204, 216, (Fig. 151), 



250. 

 Pimpinella, 247. 

 Pine-apple, 210, 219. 

 Pine, Scots, (Fig. 67), 1 18-19, 204, 



205, 222/(Fig. 156), 231, 



233, 270-4, (Figs. 182-3), 



345. 347. 348. 352. 

 Pmks, 95, 239, 241. 

 Pinus, 270. 

 Pistil, 16, 17, 31, 158-9, 206-7, 



(Fig. 139). 

 Pisum, 246. 

 Pitcher-plants, 365-6. 

 Pith, starch stored in, 91. 



use of, 97. 

 Placenta, 17, 19, 20, 206. 

 Plane-tree, 304. 

 Plant-associations, 233-4, 319- 



20, 345-99- 

 closed, 387, 399. 

 open, 387, 399. 



