Here are a couple of citrus fruits you won't find in your local shop!
Both are about the size of a grapefruit and I photographed them together simply because my potted plants happened to produce one ripe fruit of these varieties at the same time.

On the left is an unusual local fruit from the Catalan region of south-east France. Known in French as 'Poncire de Collioure' its parentage is obscure but thought to have the citron in its ancestry. Although the flesh is acid and only really any use as marmalade, the fruit is very ornamental with a pale orange pebbly skin.
Centre is a standard navel orange for size and colour comparison.
On the right is a Bergamot, Citrus bergamia, used in France and Italy to produce an oil for the perfume industry and for flavouring Earl Grey tea.
Here are some more pictures of the cut fruits and seeds.


Mike aka Citrange

The rare UK citrus collection, by citrange. How many different varieties do you have out there?!

Too many to count - probably around 100 species and varieties.
But remember most of these are small potted specimens, many only about a foot tall, and only produce one or two fruit a year.
A few plants are up to 6ft tall in large pots about 18" diameter. Any bigger and I couldn't move them into the greenhouse for winter.
Unlike Millet's wonderful huge greenhouse, mine is only 24' by 12', although each winter I also put up a plastic-covered 'tent' which is about 8' x 12'. Both are ridiculously overcrowded, so it's a struggle to walk around inside them.
I just can't bring myself to throw away any of my citrus plants!
Mike.