Only if you mean Citrus medica ...

Millet, mine aren't quite that big, but oddly, they have a rather thin skin, even though it looks lumpy on the outside, like a citron. It is most definitely a lemon, and is either seedless or nearly so and very juicy. That's my mystery lemon

You have in USA also a giant lemon :

Pondarosa !

What you think about it ?

Well, I think it's sort of an abberation, Sanguinello. A novelty. It's not a particularly great tasting lemon, just interesting because it is so gigantic. Very thick skinned due to it's citron genetics. My lemon is definitely not a Ponderosa, but most likely some sort of Sorrento lemon. Not thick skinned, although from the outside, it looks like it would be. Seedless or nearly so, despite being surrounded by other citrus cultivars. The previous owners of my home planted it, and he was of Italian descent as well, and had planted many Italian varieties of things. He just told me it was an "Italian lemon". It is really, really large. I think I posted a photo of the lemon a while back in my hand. Here it is, again:



Now granted, I don't have huge hands But, still, this is a pretty regularly sized lemon for the tree. The tree is so prolific, and there are so many lemons on it, it has pulled the tree sideways. I have to try to get into the very tight area it is growing in, and try to pull the tree back up with a cable. Crazy huge lemons. Also, the lemons will eventually drop when ripe, which is an interesting characteristic, and may help to differentiate it from other lemons. Not very thorny, so definitely not a Lisbon, way, way too big for a Eureka. I've narrowed it down to some Sorrento lemon most likely, possibly a St. Teresa Femminello, as that is one of the Italian lemons we can get here in my area of the country.

Well, all I see and hear let me think it is the Rondo Sorrentina.

I liked to see the neck and a cut to be sure ...

Here are a few more photos:

Very serrated and and scalloped leaves. New growth and new fruit are very purple:


Very pointed young fruits:


I'll see if I can get a better photo of the neck of the fruit for you.

Here's a better photo of a young fruit with this very pronounced pointed end as well as very purple flower buds:

I came across this on Wikipedia when looking up Limoncello:

" " Traditionally, it is made from the zest of Femminello St. Teresa lemons, that are also known as Sorrento lemons""

I'm an AA graduate since 12 years ago, so I no longer drink alcohol. However, I did not know that Saint Teresa Lemons were also known as Sorrento lemons. BTW I have a two year old in ground Saint Teresa Lemon tree that has just started produciing lemons. My tree is thanks to Hoosierquilt. - Millet

First off, let me congratulate you Millet. That is an exceptional achievement. I say this not just as a registered nurse, but also as a child of the most wonderful, brilliant, talented, funny, and loved mother, who sadly was not able to achieve your success. I miss her every day of my life, and so do my 3 adult daughters she never got to see grow up, now getting married, and maybe soon in a few years have made her a great-grandmother. She was my gardening inspiration, she was an incredible gardener, that could remember every single latin name of every cultivar in her garden and all our neighbor's gardens. She was the original "Master Gardener". I owe my green thumb to my mother.

And, this is why I think my lemon is probably a St. Teresa It has all the appearances of some variety of Sorrento lemon - size, juice, lumpy skin, serrated/scalloped leaves. It's just a bit bigger than the St. Teresa lemons that I have seen, so it is very possible it is one of the other Sorrentos. I will be very interested to compare my known St. Teresa's lemons to this mystery lemon tree, once my new St. Teresa starts producing. I know climate and management can have some impact of fruit production, so maybe this tree is getting just what it needs to produce these exceptionally large fruits. This is "lemon country" here.

We'll have to compare our lemons, Millet, and see how they stack up to my Mystery lemon!

Well ...

Sorrento Lemons or Amalfi lemons are all locally there traditionally growing lemons.
That does not mean Rondo = St. Theresa.

Just Sfusato di Amalfi is a Mutation of Rondo di Sorrento.

All lemons there look and taste similary to Rondo, which is no wonder for it grew there already 2000 years ago.

Pics to let you compare :

http://eventssorrento.com/wp-content/uploads/limoni-608x280.jpg?ec9f9b
http://0.tqn.com/d/italianfood/1/0/g/0/1/limonisorrento.jpg
http://alcademics.typepad.com/.a/6a00e553b3da208834015392042db8970b-500wi
http://www.youdreamitaly.com/software/immagini/0000000000727_medium.jpg
Sfusato di Amalfi

http://2.bp.blogspot.com/_gv-Y1js8cN4/SK891C60q4I/AAAAAAAABKo/zRcT8UhcW3w/s400/Sorrento+Lemon.jpg
http://www.villamassa.com/VillaMassaStore/site/custResource/cms/prodotti_tipici120305150906120725132112120802110856.jpg
Rondo

http://theitaliandishblog.com/storage/sorrentolemons.jpg?__SQUARESPACE_CACHEVERSION=1334067893561
At top Rondo and down side Sfusato di Amalfi

http://apiciusfood.files.wordpress.com/2011/10/l1030282.jpg?w=450&h=337 Ovale ... old and Big new breed right
http://www.premierproduce.net/user/products/10937-img-0-full.jpg
Ovale ancient form

http://www.califcitrusspecialties.com/lemons_femminello.htm
http://www.califcitrusspecialties.com/lemons_femminello.htm
St. Teresa

Okay, to me, based on all your photos, it looks to me like my lemon might be a Sfusato di Amalfi lemon. If it will stop raining, I'll try to run out and snap more pics.

Yes, it is possible, but I am not sure ...

The LOOOOOOOOOOOOOOONG form and the strange neck are the typical parts.

I have that what NOW is the standard Lunario in Italy.
It was crossed with Amalfi hundred yeas ago and then like 20 years this Amalfi eith the Lunario.
Now the Lunario looks even more like Amalfi than the Amalfi .. LOL

To compare :

Original Lunario :

http://www.vivaigabbianelli.it/agrumi/2371-limone-lunario-quattro-stagioni.html

http://baeume-pflanzen.com/wp-content/uploads/2010/03/zitrus7_preview.jpg

Todays Lunario :

http://www.vivaighellere.com/agrumi/limoni-aranci-e.../citrus-limon-lunario.html

http://www.verdeblog.com/wp-content/uploads/2010/01/limone_lunario.jpg


To compare some Italian standard lemons:

http://www.vivaighellere.com/agrumi/limoni-aranci-e....html?page=1&letter=

If you paste the word "femminello " in the Google word translator and ask for the matching English word, it still comes up as femminello. - Millet

OK, is there any info or history of variegated femminello lemons?