Cuban Oregano (Coleus amboinicus synonym Plectranthus amboinicus) කප්පරවල්ලිය Kapparawalliya grows wild in Sri Lanka. This photo is from my sisters garden. Brought a few cuttings to plant.
Below The Vicks Plant iriweriya / ඉරිවේරිය
Wiki says "with a pungent oregano-like flavor and odor" and The aroma of the leaves can be described as a pungent combination of the aromas of oregano, thyme, and turpentine The taste of the leaves is described as being similar to the one of oregano, but with a sharp mint-like flavor..
For those who cant be bothered looking for plants and just want to order online.