Here are photos from my second visit to the Tintori Nursery in Pescia, in September 2007.
The citrus in the display Hesperidarium have grown impressively since
my previous visit in 2004, with little bare ground now visible.
Citrus medica 'Diamonte'. Commercially grown in Italy's Calabria region, the Diamonte citron is easily recognised by its 'square shoulders'.
Labelled by Tintori as Citrus limonimedica 'Maxima', or large fruited citron. The biggest  fruits  can weigh up to 3kg. This one is not yet ripe.
Naples Botanic Garden's "Citrus grandis" in 2003.
Shown for comparison, I believe this is the same variety. The Naples tree was very tall, and this photo is of the underside of a mature fruit hanging above head height.
Part of a spectacular archway of
Lunario lemons in Tintori's Hesperidarium

page created 11 October 2007
Bunch of Imperial Lemons
Lipo or Imperial Lemon notice
A  large lemon-like fruit, but I am not certain Tintori's notice is correct with regard to the Kew Gardens plant. I am fairly certain that it originated from Rivers Nursery, and I also have a specimen from the same source. It produces large 'lemon-shaped' fruit rather than the grapefruit shape of the Tintori plant shown here. Moreover, I doubt that Rivers Nursery would have obtained a grapefruit hybrid which would probably originate from the USA. When Rivers was at its height grapefruits were only just starting to be known, so grapefruit hybrids would have originated later.
I will try and research this a bit more.
Lemon Imperial or Lipo (possibly from 'limon' and 'pomelo'?)

I don't know the origin of this variety, but it appears to be another graft chimera, similar to the famous C.aurantium Bizzaria. I brought home a small plant for  my collection.
Commercially produced in the Amalfi coastal region south of Naples, this high quality lemon variety is sponsored by the fashionable Italian 'slow-food' movement.
The name 'Sfusato' is derived from the Italian afusato meaning tapered
Unripe lemon - Limone Sfusato d'Amalfi
Lemon Bizzaria.
The picture above is taken from an 1812 drawing by botanist and artist Gallesio.

Poncirus trifoliata 'Flying Dragon'
I have identical fruit produced from seed sent from Riverside, California, and I expect  this plant originates from the same source. Thay are not the same as the elongated fruit in the original description of xSydney Hybrid.
xSydney Hybrid (Microcitrus australis x
Microcitrus australasica)
Click these buttons for  my original Tintori 2004 visit information