176 



INDEX. 



Pago. 

 Placodium Continued. 



coralloides, Tuckerm 162 



vitellinum (Ehrh.), Ach 162 



PLANTAGINACEiE 89 



Plantago 



eriopoda, Torr 89 



Patagoiiica, Jacq 89 



Pleuraphis, Torr 146 



Jamesii, Torr 146 



Pleurogyna, Esch 113 



rotata, Griseb 113 



Poa 



airoides, Nutt 149 



alpina, L 150 



Andina, Nutt 150 



ctesia, Smith 150 



serotina, Elirh 150 



tenuif olia, Nutt 150 



Pogonatum 



alpinum, Roehl 159 



capillare, Brid 159 



urnigerain, L 



Polanisia 



trachysperma.) T. & G 11 



uniglandulosa, DC 11 



PeLEMONlACE^E 105 



Polemonium 



capitatum, Hook 108 



craruleurn, L 108 



conf ertum, Gray 108 



humile, Willd 108 



pulchellum, Bunge 108 



pulcherrima, Lelim 108 



Michardsonii, Grab 108 



Polygala 



verticillata, L 19 



POLYGALACE.E 19 



POLYGONACE.E 119 



Polygonum 



amphibium, L 123 



aviculare, L 123 



Bistorta, L :. 123 



dumetorum, L 124 



erectum, L 123 



imbricatum, Nutt 123 



incarnatum, Ell 123 



Pennsylvanicum, L 123 



ramosissimum, MX 123 



tenue, MX 123 



viviparum, L 123 



Polypodium 



vulgare, L 153 



Polytricbadelphus 



Lyallii, Mitt 159 



Polytrichum 



gracile, Menzies 159 



j uniperinum, Hedw 160 



Icevipiliim, Hampe 160 



piliferum, Scbreb 160 



Populus 



angulata, Ait 129 



angmtifolia, James 129 



balsamifera, L 129 



tremuloides, MX 129 



Portulaca 



oleracea, L , 14 



retusa, Engelm 14 



PORTULACACE/E 14 



Page. 



Potamogeton 



nataus, L 132 



perf oliatus, L 132 



Potentilla 



Anserina, L 38 



arguta, Pursh 35 



concinna, Richards 37 



dissecta, Pursh 37 



dlrsrsifolia, Lehm 37 



eifusa. Dougl 36 



fissa, Nutt 36 



f ruticosa, L 38 



glandulosa, Lindl 36 



gracilis, Dougl 37 



Grayi, Watson 37 



Hippiana, Lehm 36 



liuniif usa, Nutt 37 



miUegraaMf Engelm 36 



nivea, L 36 



Norvegica, L 36 



Nuttallii, Lehm 37 



Pennsylvania, L 36 



Plattensis, Nutt 36 



procumbens, Clairv 35 



rigida, Nutt 37 



rivalis, Nutt 36 



Pottia 



cavif olia, Hedw 156 



Heimii, Sehp 156 



Primula 



aiigustif olia, Torr 89 



f arinosa, L 89 



Parryi, Gray 89 



PRIMULACE.E 89 



Prunus 



Americana, Marsh 33 



Chicasa, MX 33 



Pennsylvania, L 33 



Virginiana, L 33 



Psoralea 



argophylla, Nutt 22 



cnjptocarpa, T. & G 22 



cuspidata, Pursh 22 



digitata, Nutt 22 



floribunda, Nutt 22 



hypogaja, Nutt 22 



lanceolata, Pursh 22 



Ptelea 



iingustif olia, Benth 18 



trifoliata, L 18 



Pteris 



aquilina, L 153 



Pterospora 



Andromedea, Nutt 88 



Ptilagrostis 



MoHgolica, Griseb 145 



Puccinia 



Porteri, Peck 164 



Purshia, DC 34 



tridentata, DC 34 



Pylaissea 



intricata (Hedw.), Schp ,.. . 160 



Pyrola 



clilorantha, Swartz . . ". 88 



minor, L 88 



rotundifolia, L 88 



secunda, L 88 



Pyrrhopappus 



grancliiloruSj Nutt 86 



