Not sure if this is the right plant, described in WIKI, my Chinese Sister-in-law planted this as a herb to boil to clean the blood, with pork bones or rock sugar.
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Common Name:Red Sessile Joyweed, Red Carpet Weed, Bayam Keremak Merah, Hoong Tee Wu (Chinese): 红田乌, 红田乌草
Alternanthera sessilis is an aquatic plant known by several common names, including sessile joyweed and dwarf copperleaf. It is used as an aquarium plant. The plant occurs throughout the tropical and subtropical regions of the Old World. Wikipedia