520 



INDEX. 



Page. 



Polyaniherix Hystrix, Nees 391 



POLTGALACEiE 416 



POLYGONACEiE 298 



Polygonatum giganteum, Dietr 346 



Polygonum amphibium, L 316 



avicnlare, L 315 



Bistorta,Ii. 317 



coarctatum, Dougl 316 



confertifoliwm, Nutt 316 



ConTolvulus, L 317 



imbricatam, Nutt 316 



lapathifolium, Ait 317 



mmimum, S. Watson 315 



Persicaria, L 316 



polymorphum, Ledeb 317 



ramoaissinrnm, Mx 315 



tenue, Mx 315 



viviparum, L 317 



Polypodium vulgare, L 395 



Polypogon Monspeliensis, Desf. 378 



Polytrichadelphus Lyallii, Mitt 408 



Polytrichum juuiperinum, Dill 408 



piliferum, L 408 



PONTBDEEIACEiE 359 



Popnlus angustifoUa, James 327 



balsamifera, L 327 



Canadensis, Desf. 327 



candicans, kit 327 



monilifera, Ait 327 



tremuloides, Mx 327 



tricliocarpa, Torr 328 



Portulaca oleraoea, L 42 



POKTULACACEiE 42 



Potamogeton csespitosus, Nolte 338 



fili/ormia, Nolte 339 



gramineus, L 337 



lonchites, Tuck 337 



marinus, L. , 339 



natans, L L. 337 



pectinatus, L 338 



perfoliatus, L 337 



pusillua, L 338 



rufesoens, Schrad 337 



zosteraceus, Fries 338 



Potentilla Anserina, L 89 



arguta, Pursh 89 



diversifolia, Lehm 86, 87 



fastigiata, Nutt 88 



frutioosa, L 89 



glandulosa, L 89 



gracilis, Dougl 88 



miUegrana, Eng 85 



Newberryi, Gray 91 



nivea, L , 87 



Norvegica, L 85 



Nuttallii, Lebm 88 



Pennsylyanica, L 86,87 



Plattensis, Nutt 87 



rlgida,'Sntt 88 



Soongarioa, Bunge 87 



Page. 



Pottia cavifolia, Ehrli 398 



Heimii, Hook 399 



subsessilis, Schwg 398 



truncata, Br. & Scb 398 



Primula Parryi, Gray. 213 



PniMULACEiE 213 



Prionopsis, Nutt 158 



Prosartes Hookeri, Torr 344 



trachyandra, Torr 345 



trachycarpa, S. Watson 344 



Prosopis, L 420 



cinerascens, H. & A 420 



glandulosa, Torr 420 



pubescens, Benth 420 



Protococcus nivalis, Ag 415 



Prunus Andersonii, Gray 79 



demissa, Walp 80 



emarginata, Walp 79 



minutiflora, Eng 420 



Virginiana, L SO 



Psatbyrotes, Gray 192 



annua, Gray 192 



Pseudoleskea catenulata, Scbl 408 



Psoralea lanceolata, Pursb 63 



Ptelea angustifolia, Benth 50 



Pteris aquilina, L 395 



Pterospora Andromedea, Nutt 212 



Pterostegia, F. & M 477 



drymarioides, F. & M 477 



macroptera, Benth 477 



FtilopTiora nuta/ns, Gray 196 



Puccinia brunnea, J. S. Billings ^ . . 414 



Gayopbyti, J. S. Billings 414 



rugosa, J. S. BiUings 414 



Purshia, DC 82 



tridentata, DC 82 



Pyrola chlorantha, Swartz 211 



rotundifolia, L 211 



secuuda, L 211 



Pyrrocoma, Hook 158 



panioulata,'!. &G , 162 



Pyrus sambuoifolia, Ch. & Scb 92 



Querous alba, L 321 



Douglasii, Hook 322 



obtusildba, Mx 321 



stellata, Wang 321 



Eadula complanata, Dumort 411 



RANUNCULACBiE 3 



Kanunculus adoneua, (amcenus,) Gray 9 



afanis, E. Br 7 



alismsBfoUus, Gey 7 



Andersonii, Gray 6 



aquatilis, L 5 



auricomus, L 7 



Cymbalaria, Pursh , 7 



digitatus, Hook 8 



divaricatus, Schrank 6 



divarieatus, Gthj 6 



EsolischoltzU, Scti}. 8 



fascicularis, Mubl 9 



