706 



Polysticlium adiantiforme — Psilotum triquetrum 



Polystichum adiantiforme 34 



— deminuens 34 



— spinulosum 20 



— tsussimense 34 

 Polytonia 376, 402 

 Polytrema 254 

 Polytrichum commune 585 

 Poncirus trifoliata 98 

 Populus 97, 108, 334, 393, 610 



— adenopoda 84 



— alba 593 



— angustifolia 171 



— canadensis 593 



— deltoides 141, 144 



— grandidentata 127 



— heterophylla 141 



— italica 68 



— Maximowiczii 98 



— nigra 593 



— texana 151 



— tremula 593 



— tremuloides 127, 153, 171 



— tricliocarpa 628 

 Porphyridium cruentum 427 

 Porphyrostachys 303 

 Portulaca 329 



— grandiflora 606 

 Potamogeton Friesii 141 



— perfoliatus 618 



— Vaseyi 136 

 Potentilla 452 



— fruticosa 95 



— rupestris 62 



— tormentilla 618 



— tridentata f. hirsutifolia Ferne 123 

 Pothos 223 



Potosia 109 

 Pourouma 282 

 Prangos longiradia 70 

 Prasophyllum gracile 352 

 Premna 237 



— microphylla 86 



Primula 73, 78, 79, 88, 92, 94, 95, 240, 

 579 



— Davidii 88 



— officinalis 124 



— Younghusbandii 74 



— vulgaris 464 

 Primulinae 438 

 Pritchardia 271, 272 



Priva 237 

 Promenaea 310 

 Proserpinaca 326 

 Prosopanche 329 



— Mazzuchii Speg.* 329 

 Prosopis 154 



— glandulosa 151 



— juliflora 153, 280, 323 

 Protarum 221 

 Proteaceae 462 

 Proteus vulgaris 389 

 Protium 305 



Prunellopsis Koidzumi N. (i. 99 

 Prunus 95, 109 



— allegheniensis 128 



— armeniaca 563, 584 



— avium 443 



— cerasifera 406, 584 



— cuneata 137 



— domestica 563 



— emarginata 159 



— laurocerasus 457 



— mahaleb 451 



— pennsylvanica 128 



— Pissard i 406 



— sericea 85 



— triflora 239 



— virginiana 457 

 Pseudammi Wolff N. G. 73 

 Pseudellipanthus 249 

 Pseudochimarrhis 308 

 Pseudogoodyera 109 

 Pseudoibatia 327 

 Pseudolarix Kaempferi 85 

 Pseudolmedia 314 

 Pseudoperitheca Elenk. N. G. 3 



— murmanica* 3 



Pseudosmadingium multiflorum 280 

 Pseudosorghum 236 

 Pseudotsuga 46, 87, 154, 167, 455 



— Douglasii 161, 487 



— Forrestii 87 



— mucronata 154, 166. 171, 172 

 Pseudovossia 239 



Psidium 263 



Psilocarya corymbifera 133 

 Psilogramma N. A. 42 

 Psilophytales 598 

 Psilotum complanatum 34 



— triquetrum 34 



