INDEX 



589 



Persicaria punctata, 509 

 Personula, 54 

 Petradoria, 493 

 Petunia, 335 

 Pestalozzia Guepini, 509 

 Peucedanum foeniculaceum, 190; Grayi, 

 190; macrocarpum, 190; nevadense, 

 190; nudicaule, 190; simplex, 190, 191; 

 Suksdorfii, 190; triternatum, 190 

 Phabartis cathartica, 196 

 Phaeostroma, no; pusillum, 106, 108-111, 



118, 121; pustulosum, no 

 Phascum, 267 



Phaseolus, 255; vulgaris, 242, 243 

 Phaseolus vulgaris, A tetracotyledonous 



race of, 229 

 Phegopteris Dryopteris, 170; polypodio- 



ides, 170 

 Phellomyces, 549, 551-553. 558; sclerotio- 



phorus, 549-552, 554, 558 

 Phellopterus montanus, 191 

 Philoxerus vermicularis, 571 

 Phlox alyssifolia, 199; depressa, _ 199; 

 diapensioides, 199; diffusa, 199; divari- 

 cata, 200; Douglasii, 199; longifolia, 

 200; multiflora, 200; speciosa, 200; 

 Stansburyii, 200 

 Phoma leguminum, 509; Fourcroyae, 



509; Musarum, 509 

 Phormidium, 117 

 Photinia laevis, 246; villosa, 246 

 Phycomyces, 8, 23, 25 

 Phycophila stellulata, no, ni 

 Phyllanthus polycladus, 573 

 Phyllaria, 50 

 Phyllosticta Ipomoeae, 509; Opuntiae, 



Physalis angulata, 578 



Picea, 269; albertiana, 483; canadensis, 

 480; Engelmanni, 478, 480, 481, 483; 

 Mariana, 480; Parryana, 478, 483 



Pictetia aculeata, 567, 573 



Pilea tenerrima, 570; trianthemoides, 570 



Pilobolus crystallinus, 502, 505 



Pimpinella Saxifraga, 170 



Pinguicula, 40, 41, 44, 46, 63, 64; caudata, 

 46; crenatiloba, 46, 47; lusitanica, 46; 

 pumila, 46; vulgaris, 46, 172 



Pinus, 269, 305; albicaulis, 480, 481, 483; 

 aristata, 478, 480, 481, 483; Banksiana, 

 481; edulis, 478, 487, 493; flexilis, 478, 

 483; monophylla, 478, 487, 493; mon- 

 tana, 480; monticola, 483, 496; Mur- 

 rayana, 478, 483; palustris, 29, 31; 

 ponderosa, 483, 488; resinosa, 481; 

 scopulorum, 478, 481, 483, 485, 486, 

 488, 497; Strobus, 481 



Pionophyllum, 46, 47 



Pisonia subcordata, 571, 580 



Pisum, 306; sativum, 28i_ 



Pithecolobium Unguis-cati, 572 



Pithya Cupressi, 505 



Plagiochasma, 266 



Planera, 163 



Plantago, 427; lanceolata, 73, 427; major 

 halophila, 85; maritima, 85, 86 



Plant diseases. Cooperation in the in- 

 vestigation and control of, 517 



Plant ecology and the new soil fertility, 

 319 



Plant life. Present status of the problem 

 of the effect of radium rays on, 153 



Plectoma, 60 



Pleiochasia, 42, 51-53. 64; dichotoma, 



51.53 

 Plesisa, 60 

 Pleurage anserina, 508; fimiseda, 508; 



vestita, 508 

 Pleurotopsis niduliformis, 511 

 Pluchea purpurascens, 579 

 Plumiera alba, 576 



Poa, 515 , . , 



Podophyllum, 280, 306, 307; peltatum, 



178, 187 



Poinsettia heterophylla, 509 



Pollen grain as colloidal systems. The 

 embryo-sac and, 561 



Pollen-mother-cells of certain dicoty- 

 ledons. Cytokinesis of the, 253 



Polygala hectacantha, 573 



Polygonum, 515 



Polypodium, 267; vulgare, 129 



Polypompholyx, 41, 49; laciniata, 50 



Polyporus arcularius, 5n ; obliquus, sn 



Polysiphonia urceolata, 112, 113 



Polytrichum, 294 



Populus, 478, 483, 488; acuminata, 485, 

 487; angustifolia, 483, 485, 487; aurea, 

 482; balsamifera, 481, 483; Fremontu, 

 478; Sargentii, 485, 487; tremuloides, 

 480, 481, 483; trichocarpa, 483; Wis- 

 lizeni, 478, 487 



Poronia Oedipus, 509 



Portulaca halimoides, 571; oleracea, 571 



Potamogeton, 272, 305 



Potentilla, 127, 279; canadensis, 172; 

 pumila, 172; Tormentilla, 172 



Pourthiaea, 246, 249; villosa, 245, 246, 250 



Present status of the problem of the effect 

 of radium rays on plant life, 153 



Primula, 283, 285, 302, 303, 306, 433. 44.1. 

 442, 444, 445; kewensis, 129; sinensis, 

 284, 342, 444, 450; veris, 169, 342, 444 

 Propolis faginea, 506 

 Prosopis, 494 

 Prunus, 536; americana, 485; melanocarpa, 



485 . , . . 



Pseudocymopterus anisatus, 194; bipin- 



natus, 194 

 Pseudotsuga mucronata, 478, 483-486 

 Psilotum, 268, 304 

 Ptelea, 163 

 Pteris, 254, 267, 304 

 Pterospora, 163 



Pteryxia calcarea, 191; terebinthina, 191 

 Puccinia aculeata, 186, 187; ambigua, 



203; anachoreta, i8i; arabicola, 199; 



areolata, 186; asperior, 193; aurea, 



