Douglasii 
POLEMONIACEAE 
POLEMONIUM 
amoenum 
carneum 
confertum 
elegans . 
foliosissimum 
humile 
luteum 
micrantha 
occidentale 
pectinatum 
pulchellum 
POLYGALEAE 
POLYGALA 
Californica 
POLYGONACEAE 
POLYGONUM 
alpinum 
Var. foliosum 
Var. Alaskanum 
amphibium 
Austinae 
aviculare 
bistortoides 
Californicum 
convolvyulus 
Davisiae 
Douglasii 
dumetorum 
Engelmanni 
erectum 
Greenei 
Hartwrightii 
Howellii 
Hydropiper 
hydropiperoides 
Kelloggii 
Japathifolium 
Var. incanum 
lineare 
littorale 
majus 
minimum 
montanum 
Muhlenbergii 
Newberryi 
nodosum 
Nuttallii 
paronychia 
Parryi 
Pennsylvanicum 
Persicaria 
phytolaccaefolium 
polygaloides 
ramosissimum 
Sawatchense 
551 
449 
461 
A63 
462 
463 
461 
462 
461 
463 
461 
462 
462 
462 
72 
73 
73 
567 
576 
577 
577 
578 
578 
583 
581 
577 
584 
585 
578 
582 
585 
582 
581 
584 
579 
582 
580 
580 
583 
579 
579 
583 
581 
583 
581 
582 
579 
578 
579 
583 — 
580 
584 
579 
580 
578 
584 
582 
582 
INDEX 
Shastensis 581 
spergulariae- 
forme 583 
viviparum 577 
Watsoni 584 
POLYPOGON 724 
littoralis 725 
Monspeliensis 724 
POMAL SAE 163 
PON TEDER- 
IACEAE 666 
POPULUS 622 
alba 622 
angustifolia 622 
balsamifera 622 
deltoides 623 
tremuloides 623 
trichocarpa. 622 
PORTULACACEAE 90 
PORTULACA 50 
oleracea 91 
POTAMOGETON 674 
alpinus 674 
amplifolius 674 
foliosus 676 
Var. Californicus 676 
heterophyllus 675 
lonchites 675 
natans 674 
Nuttalli 674 
pectinatus 676 
perfoliatus 675 
Var. Richardsonii 675 
praelongus 675 
pulcher 674 
pusillus 676 
Robbinsii 676 
zosteraefolius 675 
POTENTILLA 175 
Anserina 1793 
brevifolia 178 
ciliata 175 
Drummondii 177 
fissa 176 
flabelliformis 178 
flabellifolia 178 
fruticosa 179 
gracilis 178 
glandulosa 176 
-glutinosa 175 
lateriflora 177 
millegrana 177 
Monspeliensis 176 
Newberryi 177 
Pacifica 
reflexa 
rhomboidea 
rivalis 
villosa 
Wrangelliana 
PRIMULACEAE 
PRIMULA 
Broadheadae 
Var. minor 
Cusickiana 
PROSARTES 
PRUNUS 
Oregana 
subcordata 
PSEUDOCYMOP- 
TERUS 
anisatus 
PSEUDOTSUGA 
Douglasii 
PSORALEA 
lanceolata. 
melilotoides 
phvysodes 
Purshii 
PSILOCARPHUS 
brevissimus 
elatior 
tenellus 
Oreganus 
PSILONEMA 
calycinum 
PTEROSPORA 
Andromedea 
PTEROSTEGIA 
drymarioides 
PTILOVCALAIS 
major 
nutans 
PTILORIA 
paniculata 
exigua 
tenuifolia 
virgata 
PUCCINELLIA 
angustata 
distans 
Lemmoni 
maritima 
PYROLACEAE 
PYROLA 
aphylla 
Var. paucifolia 
bracteata 
chlorantha 
elliptica 
minor 
picta 
