Plectranthus amboinicus, once identified as Coleus amboinicus, is a tender fleshy perennial plant in the family Lamiaceae with an oregano-like flavor and odor, native to Southern and Eastern Africa,  It is widely cultivated and naturalised elsewhere in the Old and New World tropics.

The leaves are strongly flavoured and make an excellent addition to stuffings for meat and poultry. Finely chopped, they can also be used to flavour meat dishes, especially beef, lamb and game. Such use as a flavouring and its geographic spread is indicated by some of the common names, and documented for Cambodia[5] and South Africa[1] It is also used as a vegetable, for example in South East Asia.[1] The herb is used as a substitute for oregano in the food trade and food labelled "oregano-flavoured" may well contain this herb.

The leaves have also had many traditional medicinal uses, especially for the treatment of coughs, sore throats and nasal congestion, but also for a range of other problems such as infections, rheumatism and flatulence. from Wikipedia