Wolffia has the fewest shared characters with the presumed ancestral Spirodela and is placed farthest away in an evolutionary tree (cladogram).
Wolffiaplants also have a sexual phase and produce flowers, although they are rarely observed in bloom.
In the southeastern United States there are records of wolffiaplant bodies being carried by a tornado, and they have even been reported in the water of melted hailstones.
Wolffia columbiana -- Center for Aquatic and Invasive Plants(Site not responding. Last check: 2007-10-31)
Wolffia columbiana -- Center for Aquatic and Invasive Plants
If Wolffia is present it gives the feeling of granularness or mealiness."
See how Wolffia species compare with the other duckweeds on the
aquat1.ifas.ufl.edu /wolcol.html (122 words)
Amazon.com: Wolffia(Site not responding. Last check: 2007-10-31)
Ligulate Wolffias of the United States by Charles Henry Thompson (Unknown Binding - Jan 1, 1896)
The comparative effects of CS and various pollutants on fresh water phytoplankton colonies of Wolffia papulifera Thompson (Edgewood Arsenal technical report) by Elmer George Worthley (Unknown Binding - 1971)
Wolffia columbiana in Concord, Massachusetts by Richard Jefferson Eaton (Unknown Binding - Jan 1, 1939)
Search for products to control Wolffia Spp. based upon pesticides registered in various states to control Wolffia Spp.(Site not responding. Last check: 2007-10-31)
Pesticides, such as products to control Wolffia Spp., are regulated by State Departments of Agriculture.
http://www.kellysolutions.com allows you to search for products to control Wolffia Spp., using data supplied by the various states that register the pesticides to control Wolffia Spp..
To find all products ever registered at EPA to control Wolffia Spp.: www.kellysolutions.com/epadata (login as username: 'Guest' and password: 'Guest' - your results will be limited to 5 items).