Index 



715 



Platanus, ;^g^, 394; occidentalis, 3-90 

 .656 



Pneumariaj 545 



Pneumococci, 35 



Poa annua, 378; callida, 533; com- 

 pressa, 378 ; curta, 534 ; Cusickii, 

 534 ; debilis, 670 ; flexuosa occiden- 

 talism 535 ; Helleri, 534; idahoensis, 



378, 



534; 

 535 r 



534; 

 sub- 

 sub - 



■ 534; interior, 536; nemoralis, 

 536; nervosa, 533; nevadeasis, 

 occidentalis, 533, 535; Olneyae, 

 pratensis, 378 ; Sandbergii, 

 scaberrinia, 534; serotina, 533 

 aristata, 534 j subreflexa, 535; 

 trivialis, 535; trivialis, 378; Wheel- 



eri, 535 

 Podophyllum peltatum, 659 



Podospliaera, 353 



Podozamites, 247 ; angustifoliuSj 247 ; 



Knowltoni, 247 ; lanceolatus, 247 

 Pogonatum brevicaule, 658 

 Pogonia, 546; ophioglossoides, 12 

 PoIemoiiJum coeruleum, 659 ; Van 



Bruntiae, 659 



Polygala sanguineaj 666 ; verticillata, 

 006 



Polygonatum, 410, 545; biflorum, 6S7 ',* 

 commutatum, 657 ; giganteum, 657 ; 

 latifoHum, 409 ; multiflorum, 409, 

 410; odoratunij 410; Polygonatum, 

 409; officinale, 410; Sigillum, 409 



Polygonella articulata, 456 



Polygoniun, 254, 443 ; amphibium, 455 ; 

 atlanticuni; 450, 451 ; aviculare, 

 442-445, 447-449, 451 ; aviculare 

 agrarium, 443 ; aviculare angustifo- 

 lium, 446 ; aviculare angustissimum, 



446 ; aviculare depressum, 445 ; avic- 

 ulare diffusum, 443 ; aviculare erec- 

 tum, 448 ; aviculare latifolium, 446, 

 448 ; aviculare laxum, 446 ; aviculare 

 maximum, 448 ; aviculare neglectum, 



446; aviculare procumbens, 445 ; 

 aviculare tenuissimum, 446, 448 ; 

 aviculare vegetum, 443, 448; Bellardi^ 

 451; buxiforme, 444-446, 450; Con- 

 volvulus, 455 ; Dumetoruni, 456 ; erec- 



turn, 444, 451 ; exsertum, 

 Fowleri, 450 ; littorale, 444, 

 maritimum, 442 ; monspeliense, 

 444, 448 ; neglectum, 446, 448, 

 orientale, 671 ; Persicaria, 671 ; 

 lificum, 449, 450 ; provinciale, 

 446 ; punctatum robustius, 



450: 



445; 

 443, 



449; 

 pro- 



445. 



455; 

 ramosissimum, 450-452 ; ramosissi- 



mum atlanticum, 450; sagittatum, 



455 ; tenue, 448, 666 ; tomentosum, 



453 ; Zuccarinii, 455 

 Polypliysa, 89 

 Polypodium vulgare, 657, 658, 660, 662^ 



669, 670; vulgare grandiceps, 558 



m 



Polystichum, 43 ; acrostichoides, 65 7, 

 658, 66t, 662 



Polytrichum commune, 65S, 665; pili- 

 ferum, 665 



Pontederia cordata, 3 ; cordata angusH- 

 foHa, 3 



Populus, 127, 130, 140, 250, 257; alha, 

 13; candicans, 14, 27; deltoides, 154; 

 grandidentata, 14, 664, 669 ; hyper- 



borea, 250, 263; orbicularis, 250; 



tremula, 14, 23; tremuloides, 14, 118, 

 125, 128, 129, 134, 144 



Porella platyphylla, 658, 662 



Porterauthus, 398 



Portulaca oieracea, 671 



Potentilla, 406, 407 ; acuminata, 407 ; 



canadensis, 670 j norvegica, 671; rcp- 



tans, 353 ; saxosa, 407 



Power of growth exhibited by ostrich 

 ferns, The, 221 



Prairies, Some unsolved problems of 



the, 265 

 Preissia, 615, 617-619, 622 

 Preliminary notes on the genus Usnea, 



as represented in New England, 309 

 Preliminary revision, The genus Cera- 



topteris : a, 463 

 Prenanthes altissima, 156 

 Present treatment of monotypic genera 



of fungi. The, 147 

 Pressure on the roots of Vicia Faba, 



Notes on the effect of mechanical, 



457 

 Problems of the prairies, Some un- 

 solved, 265 



Propositions relating to the amend- 

 ment and completion of the Inter- 

 national Rules of Botanical Nomen- 

 clature adopted by the International 

 Botanical Congress of Vienna in 



1905, 55 

 Propositions relatives a ramendement 



et au complement des Regies inter- 

 nationales de la Nomenclature bo- 

 tanique, adoptees par le Congres in- 

 ternational de Botanique de Vienne 

 en 1905, 65 



Proteoidcs daphnogenoldes, 252, 2S5 

 Protophyllum, 260; obovatum, 259 

 Prunus, 139 ; americana, 656 ; Avium, 



117, 118; serotina, 656, 664, 668; 



virginiana, 656, 668 

 Psoralea, 581, 627 

 Pteridium aquilinum, 587 

 Pteris, 466 ; cornuta, 475 ; siliquosa, 



476; thalictroides, 476 

 Pterospermites, 260 ; auriculatus, 260 ; 



obovatus, 259 



Puccinia, 549 ; angustata, 549-551 ; an- 



^statoides, 549-55 1 ; dispersa, 382, 



