So, I asked the question "agrumes passion," and we have not identified with certainty what citrus. It looks like a citron but the shape and taste lemon leaves evoke a citrus medica.
I feel that it is a hybrid between a citrus medica and Sour orange and here are three proposals that seem more serious







Citrus medica : Rhobs el Arsa
Citrus medica : Poncire de Collioure
Rough lemon Citrus jambhiri

Looks like some type of citron hybrid. Sour orange will have a winged leaf. A lemon type flavor would indicate a citron of some type.

I'm thinking C. jambhiri rough lemon, especially looking at the freshest fruit, with the "nipple/ aureole" at the base, also the cut half showing the seed shape and size, and hint of orange colour in the flesh. The leaves look about right, citron like, but with a more blunt, rounded shape than lemon.
The fruit are a bit more bumpy than usual, but not out of the range seen in fruiting seedlings.

Good call pagnr.

Poncire de Collioure: I have this variety from Baches. It has a much smoother skin than your photos

However, the picture from INRA is different, with a rougher more corrugated skin. More like your photos.


Have you considered that it might be the same as the Bizzaria Bigarade growing at the Palais Carnoles in Menton? I have never believed this is the real Bizzaria, but it does look like your fruits although I have never seen the inside flesh to compare it.

Mike/Citrange

The poncire of Collioure Baches actually has a smoother skin and a more rounded shape. [url] http://www.agrumes-baches.com/baches/1292/boutique/44407/citrus_medica___poncire_de_cotlliure_.htm#.UWsHqaI3IrV[/url]As against the appearance of poncire of collision on the photo of the INRA is enough to my fruit. The INRA is a very serious organization. I trust their picture unlike the Isolotto site. This means may be that the poncire is very variable in shape except for the cultivar Baches? I thought the bigarade Bizzaria but the appearance and taste of the leaves does not match the taste and bitter orange skin is lemon with a little bitterness. All this reminds me of a hybrid citrus medica 66% and 33% Bitter Bizzaria. Hev who work at CIRAD a serious body think it is a Rough Lemon which is a hybrid of citron and mandarin and sometimes this morphological variability or some mutants.http://www.agrumes-passion.com/identification-agrumes-f60/topic2884-30.html
Pagnr also confirms the rough lemon and I thank him.
However, the rough Lemon or may not be used in France and this tree more than fifteen years has been sold seems like a citron?

The peel of a citrus fruit can develop a difference appearance, for example roughness or smoothness, due to the environment which the tree is growing in. Also the appearance of a tree, and its fruit can have a difference of appearance if the tree's history comes from a long old seed line, as apposed to one with young recent life history. - Millet