250 THE STORY OF PLANT LIFE 
Pea and Vetch Group, 84 
Peach, 96 
Pear, 8 
Pearlworts, 34, 65 
Peat, 48 
Pelargonia, 74, 75, 76 
Pellitory-of-the-wall, 176, 177 
Pennycress, 54 
Pennywort, 34 
Peppermint, 168 
Pepperwort, 33, 54, 90 
Perennials, 6, 9, 33 
Perigynous, 17 
Peruvian Balsam, 85 
Petaloidez, 197 
Phanerogams, 29 
Phillyrea, 155 
Phyllodoce, 153 
Phyteuma, 149 
Pig Nut, 113 
Pilewort, 37, 44 
Pimpernel, 159 
Pinax, 28, 65 
Pine, 186 
Pink Group, 65 
Pinks, 34, 65 
Piston movement, 22 
Plantagenet kings, 89 
Plantaginez, 122 
Plantain, 19 
Pliny, 53, 62, 73, 82, 218 
Plum, 8, 96, 97 
Plumbaginez, 122 
Pollination, 16, 18 
is by animals, 22 
Polygonacez, 175 
Polypetalz, 28, 29, 30, 33 
Pomez, 96 
Pond weeds, 52 
Poppies, 90 
Populus, 187 
Porous anthers, 22 
Portulacez, 34 
Potato, 210 
Primrose, 22, 158, 159, 162, 163 
is Group, 158 
Primula, 159 
‘ vulgaris, 162 
Primulacez, 122, 158, 159 
Privet, 106, 155, 156 
Prostrate plants, 10, 11 
Proterandry, 21 
Proterogyny, 21 
Prunella vulgaris, 169 
Prunus Avium, 98 
»  Cerasus, 98, 99 
» spinosa, 100 
Purple Deadnettle, 172 
Pyramid habit, 13 | 
Pyrola, 122 
Pyrus Malus, 108 
Pythagoras, 50 
———— a 2 
Queen of the Meadows, 102 
Quercus Robur, 187 
Quince, 97 . 
Radish, 54 
Rampion, 149 
Ranunculacee, 33, 34 
Ranunculus Ficaria, 44 
a vepens, 41 
Rape, 54 
Raspberry, 96, 97, 98, 104 
Ratafia, 96 
Ray, 28 
Red Campion, 94 
» Clover, 91, 92, 93 
», Currant, 25 
Reed Mace, 26 
Reeds, 116 
Reigate, 35 
