This is a very common herb found throughout Singapore so not surprisingly it is very common around NP. It has similar medicinal properties as Oldenlandia diffusa ( 白花蛇舌草 ) which is the main ingredient used in 白花蛇草水. O. diffusa plant is more difficult to find in Singapore. I have seen it in Thomson Nature Park as well as Upper Pierce reservior growing in moist and shady locations.
The 2 plants look similar but can be distinguished by the number of flowers per leaf axis as well as the shape of the main stalk. O.diffusa has a round stalk whereas O.corymbosa has a squarish stalk and carries more than one flower per leaf axis.
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