Florida produces our key limes. which are mexican in origing. They are smaller, rounder, and more acid than the common persian lime we find in most our markets. Either variety works well.
This is the recipe we use at the Inn. It is very popular. be careful to use only one drop of food coloring or the pie will look artificial and store-bought.
The key limes have a sharper taste than regular ones. You may use the regular limes or yellow limes (usually found in Mexican markets) but they won't have as good of taste.