Two years ago I was in The Botanical Garden of Pisa. I took budwoods from this tree.





Unfortunately, I don't know what kind of citrus is it? I didn't eat any fruit from the tree.
Maybe someone will recognize.

Darn, I was in Pisa, but was unaware that the city had a botanical garden. I went to see the Leaning Tower and the Baptismal building. Need to pay better attention to tourist guides... - Millet

I have been to Pisa to see the leaning tower too. I never heard anything about any garden. The tree should have been marked with its name. Tom

My guess would be some kind of sour orange. Willowleaf maybe?

Milett and Tom
I learned of Botanical Garden of Pisa from a friend on the forum (Citrange).
Since I have family in Bologna I could go and visit gardens in Pisa, Modena Bologna. But I didn't see so many places with citruses.

Tom,I haven't seen any marked.

Soon I'll add more pictures.

MarcV, Willowleaf - I don't think so. But It can be some kind of sour orange.
It grows in ground.

I included several northern Italian botanic gardens in my listing of Poncirus trifoliata specimens. See
http://www.homecitrusgrowers.co.uk/wheretoseePT/pisaluccabologna.html
These areas are generally not considered suitable for growing true citrus, and I don't recall seeing any on my visit some years ago.
However, the 'seed distribution list' from the Pisa botanic garden does indicate that there is a bitter orange growing there, but no particular variety name:

Quote:

Rutaceae 221 G Citrus aurantium L. 222 G Poncirus trifoliatus Rafin.

The Pisa Botanic Garden is said to be the oldest in Europe.

Quote:

The garden was established in 1544 under Cosimo I de' Medici as the first university botanical garden in Europe, and entrusted to the famous botanist Luca Ghini of Imola. In 1563 the garden was relocated from its original riverside location (now the Medicean Arsenal) to one near the convent of Santa Marta, and in 1591 again moved to its third and current location

On a hot summer's day, it is a pleasant shady relief from the tourist sites.

Mike/Citrange

I just found a Tiwanica tree and the fruit and leaves look the same to me. The tree I looked at is in Savannah and I be leave was from Bob McCartney. IMHO

I think it's definitely citrus aurantium. Today I saw that has a small flowers.
I keep it in the basement. There is a dark and cold about 5-10 C. It is very odd.