Kangkong Water Spinach: is an herbaceous aquatic or semi-aquatic perennial plant of the tropics or subtropics. Leaves are flat, and vary in shape depending on variety, from heart-shaped to long, narrow and arrow-shaped. Narrow leaves are 1-2.5 cm wide and 20-30 cm long. Broad leaves are up to 5 cm wide and 15-25 cm long.