352 THE STORY OF PLANT LIFE 



Pasque flower, 72 

 Parasitical plants, 13, 29, 320 



„ fungi, SI 



Pavonia, 155 



Pea and Vetch Group, 195, 204 

 Pea Group, 182, 183 

 Peat, 18, 19 

 Pectocelluloses, 55 

 Pelargonia, 166 

 Pennines, 149, 179, 220, 229 

 Penny Cress, 93, 95, 98, 107, 108, 



109 

 Pennywort, 219, 309 

 Peplis, 62 

 Pepper Cresses, 95 

 Pepperwort, 62, 98 



Tribe, 95 

 Perchlorates, 52 

 Perennials, 31 

 Perforate St. John's Wort, 152, 



153 

 Perianth, 16 



Pericycle, 10 



Persicaria, 89 



Periwinkle Group, 274 



Permanent tissue, primary, 9 



,, „ secondary, 9 



Phanerogams, 58 



Phatany root, 140 



Philadelphiis, 212 



Phloem, 9, 10, II, 25, 35 



Phoenix Fairy Flower, 175 



Phosphates, 50 



Phosphoric acid, 50, 52 



Phosphorus, 18, 47, 49, 50, 56 



Photosynthesis, 7, 29, 44, 45, 46, 



47, 49. 51 

 Phyllodes, 24 



Phylogeny, 2 



Physical drought, 19, 22,31, no 



125 



Physiological drought, 19, 23, 26, 



31, no, 125,315 

 Physiology, 2 

 Pig Nut, 259 

 Pillwort, 106 

 Pimpernel, 330 

 Pine, 58, 321 

 Pink Group, 126, 128, 144, 147, 



161, 163 

 Pistil, 16 



Piston mechanism, 199 

 Pitt, II 



Pitted vessels, 38 

 Plantain Group, 274 

 Plastids, 8 

 Pliny, 72, 76, 112, 118, 163, 335 



„ the Elder, 316 

 Plumbaginacese, 63, 322 

 Plumbago, 323 

 Pollen, 16 



,, tube, 16 

 Pollination, 16 

 Polycarpon, 129 

 Polygala vulgaris, 141 (143) 

 Polygalaceae, 64, 139 

 Polypetalae, 6 1, 63, 65 

 Pomegranate, 240 

 Pondweeds, 233 

 Poor Man's Weather-glass, 329 

 Poppies, 81, 82, 83, 89 

 Poppy, 81, 82 

 Poppy Group, 80, 88 

 Portulacese, 64, 135 

 Potash, 17 

 Potassium, 47, 48, 51, 52 



,, nitrate, 48 



Potatoes, 49, 55 

 Potentilla, 205 

 Poterium, 63 



„ Sanguisorba, 209 (211) 

 Pretty St. John's Wort, 152 



