INDEX TO SCIENTIFIC NAMES 157 
Page 
Polypodiaceae_ 17 
Pomaceae_ 78 
Populus angustifolia _ 46 
balsamifera _ 46 
sargentii _ 46 
tremuloides _ 46 
Portulacaceae___ 54 
Potamogeton _ __ 31 
alpinus _ 31 
filiformis _ 31 
heterophyllus _ 31 
lonchites _ 31 
natans _ 31 
obtusifolius _ 31 
pedinatus __ 31 
perfoliatus _ 31 
praelongus _ 31 
robbinsii _ 31 
Potentilla biennis _ 77 
diver sifolia _ 77 
glaucophylla _ 77 
gracilis __ 77 
hippiana _—:_ 77 
leucocarpa _ 77 
macounii _ 77 
monidensis --- 77 
monspeliensis -- 77 
nuttallii _ 77 
pectiniseda _ 77 
pennsylvanica __ 77 
pinnatiseda _ 77 
quinquefolia _ 77 
rubricaulis _ 77 
subjuga _ 77 
viridescens _ 77 
wyomingensis ___ 77 
Primulaceae_ 99 
Prunella vulgaris __ 108 
Prunus melanocarpa _ 78 
Pseudotsuga taxifolia _ 23 
Pteridium aquilinum _ 18 
Pterospora andromedea _ 96 
Ptilocalais nutans _ 137 
Puccinellia nuttalliana _ 35 
Pulsatilla hirsutissima _ 60 
Pyrola chlorantha _ 96 
minor. _ 96 
pida _ 96 
secunda _ 96 
uliginosa _ 95 
Pyrolaceae_ 95 
Pyrrocoma integrifolia __ 
lanceolata 
uniflora _ 
Ranunculaceae 
Ranunculus alismellus _ 
alpeophilus __ 
douglasii _ _ 
eremogenes 
glabberrimus _ 
inamoenus _ 
jovis- _ 
macounii 
maximus _ 
montanensis 
natans _ 
purshii 
Page 
_ 122 
_ 122 
_ 122 
_ 57 
_ 63 
_ 62 
_ 63 
_ 62 
_ 63 
_ 62 
_ 62 
_ 63 
_ 63 
_ 63 
_ 62 
62 
reptans 
_ 62 
saxicola 
_ 63 
suksdorfii 
_ 63 
Rhamnaceae 
_ 85 
Rhus rydbergii __ 
_ 85 
trilobata 
_ 85 
Ribes americanum 
_ 73 
inebrians _ 
_ 73 
lacustre 
_ 72 
montigenum 
_ 72 
petiolare 
_ 73 
viscosissimum 
_ 72 
Roripa curvisiliqua 
_ 67 
hispida 
_ 67 
lyrata„..„ 
_ 67 
palustris 
_ 67 
sinuata 
_ 67 
Rosa bourgeauiana 
_ 78 
fendleri 
_ 77 
sayi 
_ 77 
woodsii 
_ 78 
Rosaceae 
_ 73 
Rubiaceae 
_ 114 
Rubus parviflorus _ 
_ 74 
strigosus 
_ 74 
Rudbeckia occidentalis ___ 
_ 128 
Rumex acetosella 
_ 50 
brittanica _ _ 
_ 51 
mexicanus ___ 
_ 51 
occidentalis _ 
_ 52 
paucifolius 
_ 50 
persicarioides 
_ 51 
venosus 
_ 52 
Ruppia pedinata __ _ 
_ 31 
Sagina saginoides __- 
56 
