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I found these looking for invasive, illegal, and other wise anticipated invasive species of California to learn a bit more. I'm surprised to find out frogbit. Elodea. Water hyacinth. Giant salvinia among other are on this list.
http://www.sfei.org/nis/NISguidebooklowres.pdf
http://plants.usda.gov/java/noxious?rptType=State&statefips=06
http://www.sfei.org/nis/NISguidebooklowres.pdf
http://plants.usda.gov/java/noxious?rptType=State&statefips=06