Sorry! this is the sources of information you can read ... http://www.fao.org/fileadmin/templates/agphome/documents/Biodiversity-pollination/Weeds/Docs/Water_Hyacinth.pdf
Wow I didn't know that, just thought it's a really beautiful flower. But don't worry this wasn't in the wild, found this growing on a pond. Thanks for the info anyway;)
Maybe you also have known about this one. I think you should concern for it occurrence in Singapore. It is a really invasive species, worst aquatic weed that has been listed as 100 worst invasive species all over the world. See: http://www.k-state.edu/withlab/consbiol/IUCN_invaders.pdf
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