Parsley and basil are not the same herbs. However, they share some similarities, which is why basil works so well in replacing parsley. Basil and parsley have very different origins. Basil is native to India, whereas parsley comes from Europe and Western Asia. These two herbs, despite their different origins, are also members of different plant families. Petroselinum crispum is the botanical name for parsley. Petroselinum belongs to the Apiaceae genus. Basil is, however, scientifically called Ocimum Basilicum and is a member of the Lamiaceae family. Both families are flowering plants that are well-known for their aromatic properties. Lamiaceae and Apiaceae can be classified as types of mint. Parsley and basil may be similar in some aspects, but the current system of plant classification proves that they are not identical. Parsley and basil are also very different in taste. Parsley can be substituted with basil with good results, but depending on the dish, it is more bitter and earthier than basil.