I only know what this Asian Vegetable is called in my language, what
Go ahead and post your question. If you can, try to find out what the Latin Name is by using the Search Engine. The Latin Name is also known as the Scientific or Botanical name.
Simply input what you know the vegetable as in quotations, then space then again in quotations "Latin Name" and there's a good chance something will come up.
Why are Latin Names so Important? "...the plant commonly referred to as black-eyed Susan is known by the botanical name, Rudbeckia hirta. The botanical name of a particular plant is usually made up of two parts. The first is the genus, which is always capitalized. In our example, the genus is Rudbeckia. Each genus may contain many different plants. The second part of the botanical name is the species epithet. In our example, the species epithet is hirta. So, while there are many plants in the genus Rudbeckia, there is only one known as Rudbeckia hirta. Taken together, Rudbeckia hirta is referred to as a species."
In the case of "kang kung" or "water spinach", "Ipomoea aquatica" is the "species and genus" which refers to both "watercress" and "water spinach".
The difference comes with the several subspecies, variety, etc. which is why it is so important to try and track down the Latin/Botanical/Scientific Name because it is universal around the world. If you know this name, you can go anywhere in the world and it refers to the exact same plant.
For example: Ipomoea aquatica Forsskal
* Ipomoea aquatica Forssk. (Alba Group)
* Ipomoea aquatica Forssk. (Lowland Group)
* Ipomoea aquatica Forssk. (Rubra Group)
* Ipomoea aquatica Forssk. (Upland Group)
* Ipomoea reptans (L.) Poiret, nom. also known as water glorybind, water spinach, water convolvulus, Swamp morning-glory, and swamp cabbage