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Hawaii's Most Invasive Horticultural Plants |
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Hawaii's Most Invasive Horticultural Plants |
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 (Photo credit: George Staples) |
| Description: | Free-floating herb with 2-10" basal rosette of light-green, squared leaves, each having 5-7 vertical grooves and notched at the tip. |
| Risk areas: | Freshwater lakes, ponds, marshes, ditches, canals, slow-moving streams. |
| WARNING: | Colonies develop in such numbers by vegetative spread that still waters can be covered with a continuous carpet of plants. |