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Nuphar advena
http://aquat1.ifas.ufl.edu/nulupic.html
Images and description of Spatterdock.
Nuphar lutea
http://plants.usda.gov/cgi_bin/plant_profile.cgi?symbol=NULU
Yellow pond-lily.
Nuphar polysepalum
http://www.botany.hawaii.edu/faculty/carr/images/nup_pol.jpg
image