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Ludwigia alternifolia
http://www.ct-botanical-society.org/galleries/ludwigiaalte.html
Image of Seedbox.
Ludwigia bonariensis
http://plants.usda.gov/cgi_bin/plant_profile.cgi?symbol=LUBO
Carolina primrose-willow.
Ludwigia hexapetala - Water Primrose
http://www.ecy.wa.gov/programs/wq/plants/weeds/water_primrose.html
Description, images, and control of this invasive plant in Washington.
Ludwigia octovalvis
http://www.botany.hawaii.edu/faculty/carr/images/lud_oct_fl.jpg
image
Ludwigia peruviana
http://2bnthewild.com/plants/H410.htm
Images and description of Peruvian Primrose Willow.
Ludwigia Species
http://aquat1.ifas.ufl.edu/ludwpic.html
Images and brief description.