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Bacopa caroliniana
http://aquat1.ifas.ufl.edu/bacopic.html
Images and description.
Bacopa caroliniana
http://plants.usda.gov/cgi_bin/plant_profile.cgi?symbol=BACA
Images and USA distribution of Blue Waterhyssop.
Bacopa monnieri
http://www.floridaplants.com/Eflora/bacopa_monnieri.htm
Image and Florida distribution.
Bacopa monnieri
http://aquat1.ifas.ufl.edu/bacmon.html
Images and description of Smooth Water Hyssop.
Bacopa rotundifolia
http://plants.usda.gov/cgi_bin/plant_profile.cgi?symbol=BARO
Disk waterhyssop.