640 
amphibium, 298 
arenastrum, 556 
aviculare, 300 
Bistorta, 298 
Convolvulus, 300 
dumetorum, 301 
elatum, 555 
Fagopyrum, 556 
Hydropiper, 299 
lapathifolium, 298 
laxum, 555 
littorale, 556 
maritimum, 800 
microspermum, 556 
minus, 299 
mite, 299 
nodosum, 555 
Persicaria, 299 
pseudo-dumetorum, 556 
Raii, 300, 613 
rurivagum, 556 
terrestre, 555 
viviparum, 298 
vulgatum, 555 
Polypodium 
alpestre, 412 
cambricum, 598 
Dryopteris, 408 
Phegopteris, 408 
Robertianum, 408 
vulgare, 407 
Polypogon 
littoralis, 385 
maritimum, 
monspeliensis, 385, 614 
Polystichum 
aculeatum, 409, 599 
angulare, 410, 615 
lobatum, 409 
Lonchitis, 409 
Populus 
alba, 312 
canescens, 313 
glabra, 560 
nigra, 560 
tremula, 313 
villosa, 560 
INDEX. 
Potamogeton 
acuminatus, 583 
acutifolius, 342 
compressus, 342, 583 
crispus, 343 
decipiens, 583 
densus, 341 
ericetorum, 583 
eu-pectinatus, 583 
filiformis, 341 
flabellatus, 583 
fluitans, 584 
gracilis, 583 
gramineus, 342 
heterophyllus, 344 
lanceolatus, 344 
lucens, 348, 613 
marinus, 583 
mucronatus, 583 
natans, 345, 584 
nitens, 344 
oblongus (polygonifolius), 345, 
584 
obtusifolius, 342 
pectinatus, 341 
perfoliatus, 343 
plantagineus, 345 
polygonifolius, 345 
prelongus, 344 
pseudo-fluitans, 584 
pusillus, 342 
rufescens, 345 
scoparius, 583 
trichodes, 342 
zosterifolius, 343 
Potentilla 
alba, 501 
alpestris, 159 
auserina, 158 
argentea, 158 
Comarum, 160 
Fragariastrum, 160, 609 
fruticosa, 157 
hirta, 501 
mixta, 501 
nemoralis, 159 
norvegica, 501 
