520 
INDEX. 
FoJyantherix Ryslrix,'!^ees 891 ; 
POLYGALACE^ 416 
PoLYGOXACEiE 298 
Polygouatum giganteum, Dietr 346 
Polygouum amijhibiiim, L 316 
aviculare, L 315 
Bistorta, L 317 
coarctatum,Dongl 316 
coiiferiifoHinn, Nutt 316 
ConTolviilus, L 317 
imlricatnm, Nutt 316 
lapatbifoliuiu, Ait 317 
minimum, S. Watson 315 
Persicaria, L 316 
polymoqilium, Lcdeb 317 
ramosisshnitm, Mx 315 
tenue, Mx 315 
viviparum, L 317 
Polypodium vulgare, L 395 
Polypogon Mouspelieusis, Desf. 378 
Polytnchadt'lphus Lyallii, Mitt 408 
Polytriclium juniperiuum, Dill 408 
piliferum, L 408 
POXTEDKKIACE.E 359 
Populus au(jmtifoUa, James 327 
balsamifera, L 327 
Canadensis, Desf. 327 
candicans, Ait 327 
monilifera, Ait 327 
tremuloides, Mx 327 
trichocarpa, Torr 328 
Portulaca olcracea, L 42 
PORTULACACEJ3 42 
Potamogeton cajspitosus, Nolte 338 
fiUfonnis, Nolto 339 
gramineus, L 337 
lonchites, Tuck 337 
marimis, L 339 
natans, L 337 
pectinatus, L 338 
perfoliatns, L 337 
pusillus, L 338 
nifescens, Sclirad 337 
zostoraceus, Fries 338 
Potcutilla Anscrina, L 89 
arguta, Pursli 89 
(liversifolia, Lelim 86, 87 
fastigiata, Nutt 88 
fruticosa, L 89 
glandulosa, L 89 
gracilis, Dongl 88 
millegraua, Eng 85 
Newberryi, Gray 91 
nivea, L 87 
Norvegica, L 85 
Nuttallii, Lehm , 88 
Pennsylvanica, L 86, 87 
Plattensis, Nutt 87 
rhjida, Nutt 88 
Soongarica, Buuge 87 
Page. 
Pottia cavifolia, Ehili 398 
Heiuiii, Hook 399 
subsessilis, Scbwg 398 
truucata, Br. & Scb 398 
Primula Parryi, Graj^ 213 
Pkimlxack^ 213 
Prionopsis, Nutt 158 
Prosartes Hookeri, Torr 344 
tracbyandra, Torr 345 
tracbycarpa, S. Watson , 344 
Prosopis, L 420 
ciuerasceus, IT. & A 420 
glandulosa, Torr 420 
pubesceus, Bentb 420 
Protococcus nivalis, Ag 415 
Prunus Andersonii, Gray 79 
demissa, Walp 80 
emarginata, Walp 79 
minutiflora, Eng 420 
Virginiana, L 60 
Psatbyrotos, Gray 192 
annua, Gray 192 
Psoudoleskea cateuulata, Scbl 408 
Psoralea lanceolata, Pursli 63 
Ptelea angustifolia, Bontb 50 
Pteris aquilina, L 395 
Pterospora Andromedca, Nutt 212 
Pterostegia, F. & M 477 
drymarioides, F. & M 477 
macroptera, Bentb 477 
rtilophora nutans, Gray 196 
Puccinia brunnea, J. S. Billing.s 414 
Gayopbyti, J. S. Billings 414 
rugosa, J. S. Billiugs 414 
Pursbia, DC 82 
tridentata, DC 82 
Pyrola cblorantba, Swartz 211 
rotundifolia, L 211 
secunda, L 211 
Fyrrocoma, Hook 158 
panicidata, T. & G 162 
Pyrus sarabucifolia, Cb. & Scb 92 
Quercus alba, L 321 
Douglasii, Hook 322 
ohtmiloba, Mx 321 
stcllata, Wang 321 
Radula complanata, Dumort 411 
KAxrNcri.ACE^E 3 
Eaumiculus adoneus, (amocnus,) Gray 9 
afiSnis, R. Br 7 
alisma?foIius, Gey 7 
Andersonii, Gray 6 
aquatilis, L , 5 
auricomus, L 7 
Cymbalaria, Pursli 7 
digitatu.s. Hook 8 
divaricatus, Scbrauk 6 
diraricaius. Gray 6 
EschschoUzU, Scbl 8 
fascicularis, Mubl 9 
