From Wikipedia (http://en.wikipedia.org/wiki/Ipomoea_aquatica): Kangkong (Ipomoea aquatica) is a semi-aquatic tropical plant grown as a leaf vegetable.
Ipomoea aquatica grows in water or on moist soil. Its stems are 2-3 m or more long, hollow, allowing them to float, and these root at the nodes. The leaves vary from sagittate (typical) to lanceolate, 5-15 cm long and 2-8 cm broad. The flowers are trumpet-shaped, 3-5 cm diameter, usually white in colour.
It has also been introduced to United States of America where its high growth rate caused it to become an environmental problem, especially in Florida and Texas. It has been officially designated by the USDA as a "noxious weed."
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Kangkong has done exceptionally well in my AP system maybe too well. It has spilled over onto my lawn and taken root and can probably be contained by mowing. My concern is how the root system has litterally choked the growbed to a point where you cannot separate the gravel to plant anything else. On a large growbed that would be devastating but containable in smaller growbeds.
I intend to keep the Kangkong growing because I like it in salads or steamed with butter but that growbed is not useable for anything else.
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game, set and match on that stroke 