Pellaea
boivini
Penthorum
sedoides
Persicaria
sp Kawagoeanum
sp Sao Paulo
Philydrum
lanuginosum
Phyllanthus
fluitans
Physostegia
purpurea
Pilularia
americana
Pistia
stratiotes
Plagiochila
beddomei
Podostemum
ceratophyllum
sp Vietnam nano
Only one species,
P. ceratophyllum
found in North America.
Pogostemon
cablin
Patchouli
deccanensis
erectus
helferi
quadrifolius
stellatus
Polygonum
barbatum
maharastransii
Polypleurum
stylosum
Potamogeton
acutifolius
alpinus
gayi
gramineus
heterophylla
nodosus
perfoliatus
pusillus
Prionium
serratum
Proserpinaca
palustris
"Mermaid weed"