How many different types of mint (the herb) are there?

Question:

Answers:
Mint is botanically called Mentha it is the Lamiaceae family. There are many varieties of mint. The most common are
M. gentilis (Golden apple Mint)
M. piperita (Peppermint)
M. pulegium (Pennyroyal)
M. requienii (Corsician Mint, Jewel Mint of Corsica)
M. spicata (Spearmint)
M. suaveolens (Apple Mint)
also in the Lamiaceae family are the Nepetas such as
N. cataria (Catnip)
N. faassenii (Catmint)
N. sibirica (Blue Beauty)

Lamiaceae are all members of the mint family of herbaceous plants and shrubs. Many of this group are aromatic and the famliy contains most of the familiar kitchen herbs, such as basil, mint, oregano and sage.
I think there are too many to mention here but look up Lamiaceae, Mentha, and Nepeta plants and you will get an idea as to how many there are. I have listed for you the most common ones.
Also remember that all of these plants are invasive and should be kept contained unless you want an entire bed of mint. I have catnip, spearmint and peppermint growing in the edge of my yard where I can keep it mowed and pulled so that it does not invade my flower beds. It is wonderful to smell them as we sit near them and after a rain there are very pungent.
I hope this helps you.