INDEX 



305 



Papyrus 1 



Parasite 219 



Passifloracese 114 



Passion Flower 111 



Paullinia 111, 112 



Pavia 177 



Pea 102 



Pear 56, 62, 198, 223; see also 



Pyrus communis 

 Pereskia 128 



Perfoliate Honeysuckle 221, 222 

 Periderm 91 

 Periwinkle 116, 117 

 Petermannia 114 

 Pharbitis 106 

 Philadelphia 94 

 Picea excelsa 3, 7, 11, 31, 32, 



36, 45, 61, 95, 98, 99, 133, 



146, 147, 274 

 Pine 23, 36, 39, 53, 65, 67, 74-8, 



163, 177, 182; see also Pinus 

 Pinus 23, 36, 39, 53, 65, 67, 74-8, 



163, 177, 182 



P. Cembra 142, 143, 156, 274, 



275 



P. excelsa 144, 275 

 P. Laricio 136, 139, 273 

 P. Montana 138, 272 

 P. monticola 144 

 P. Pinaster 136, 139, 140, 273 

 P. Pinea 8, 10, 69, 136, 137, 



139, 141, 274 

 P. Pumilio 1 



P. Strobus 136, 143, 144, 275 

 P. sylvestris 24, 44, 61, 67, 68, 



95, 97, 99, 136, 138, 182, 272 

 P. Tada 136, 139 

 Piper Jlumense 102 

 Pistia 127 

 Pisum sativum 109 

 Plane 62, 69, 72, 87, 90, 94, 164, 



175, 176, 213, 283, 284; see also 



Platanut 

 Platanus 62, 69, 72, 87, 90, 94, 



164, 175, 176, 213, 283, 284 

 P. acerifolia 175 



P. occidentalis 175 



P. orientalis 175 



Plum 56, 259, 277, 279 ; see also 



Prunus domestica 

 Plumbago 106 

 Poa aquatica 127 



P. fluitans 127 



Polarity of shoots 48 



Pollarding 61 



Pollard Oak 16 



Pollard Wilow 16 



Polygonum 106, 117 



P. Bistorta 120 



P. cuspidatum 120, 121 



Pontederia 127 



Poplar 32, 36, 38, 44, 45, 61, 62, 



86, 164, 201, 260; see also 



Populus 

 Populus 26, 32, 36, 38, 44, 45, 



61, 62, 86, 164, 201, 260, 289 

 P. alba 56, 182, 187, 188 

 P. canadensis 214 

 P. cinerea 187 

 P. nigra 95, 213, 214 

 P. nigra v. pyramidaUs 10, 11, 12, 



64, 65, 134, 182 

 P. tremula 182, 187 

 Portulacace 129 

 Potamogeton 127 

 Potato 118, 122 

 Potentillce 116 

 Primrose 119 

 Privet 62, 82, 247, 253 ; see also 



Ligustrum vulgare 

 Procumbent stem 117 

 Prostrate stem 117 

 Pruning 63 



Prunus 26, 175, 182, 293 

 P. Amygdalus 174, 298, 299 

 P. Avium 148, 173, 174 

 P. Cerasus 173 

 P. domestica 56, 174, 259, 277, 



279 



P. insititia 174, 233, 277 

 P. Laurocerasus 253 

 P. lusitanica 253 

 P. Mahaleb 277, 278 

 P. Padus 44, 62, 148, 174, 277, 



278 

 P. spinosa 23, 27, 28, 62, 233, 



234, 259, 277, 278 

 Psamma arenaria 122 

 Pseudo-bulbs 126 

 Pseudotsuga Douglasii 146, 147, 



148, 163, 272 

 Pterocarya 191 

 Purple Willow 257, 263 

 Pyramidal trees 11 



