In Mexico, a limon (lemon) is green and small and potent.

In other words, their lemon is our (Canadian/U.S.) lime.

They apparently have something they call a lime (lima) that is yellow like our lemon. However, it is sweet.

A bit confusing.

[When I saw the limas being sold at the harbour of Lake Pátzcuaro, I just had to buy one and see what all the self-perpetuated hype was about. In the end, it didn't taste very good... Oh well, at least I got a picture!]