How many different types of potatoes are there?

It's impossible to give an exact number for the different types of potatoes, as there are:

* Thousands of potato varieties in existence, with new ones being developed all the time.

* Continual genetic variation within potato species, making classification challenging.

* Regional variations in potato names and classifications.

However, we can break down the types of potatoes based on common usage and characteristics:

By Culinary Use:

* Starchy: Good for mashing, roasting, and baking. Examples: Russet, Idaho, Yukon Gold.

* Waxy: Hold their shape well when boiled or steamed, ideal for salads and potato salad. Examples: Red Bliss, Fingerling, New Potato.

* All-Purpose: Can be used for a variety of dishes. Examples: Yellow Finn, Kennebec, Red Pontiac.

By Skin Color:

* Red: Red Bliss, Red Pontiac, Norland.

* Yellow: Yukon Gold, Yellow Finn, Gold Rush.

* White: Russet, Idaho, Kennebec.

* Purple: Purple Majesty, Blue, Vitelotte.

* Blue/Black: Purple Majesty, All Blue, Vitelotte.

By Shape:

* Round: Russet, Idaho, Yukon Gold.

* Long: Fingerling, Red Pontiac, Kennebec.

* Oval: Red Bliss, Yellow Finn, Norland.

By Growing Season:

* Early: Red Bliss, Norland, Yukon Gold.

* Mid-Season: Russet, Idaho, Kennebec.

* Late: Fingerling, Purple Majesty, Vitelotte.

In summary, while a precise count is impossible, the world of potatoes offers a vast and delicious diversity for every culinary need and preference.