Genoaで最も古い樹木はどれですか。
The only tree in Genoa with an age anybody actually recorded is a European hop-hornbeam at Villa Serra di Comago, which Liguria's regional register puts at 160 to 170 years. Every other age on this list is worked back from trunk girth, because Italy's national monumental tree register has no age field at all. The thickest trunk in the old town belongs to a holm oak at San Pantaleo, and the largest anywhere in the city is a camphor on Via Romolo Gessi at 734 centimetres, though that figure rests on a single source.
Italy protects monumental trees by national law and lists them tree by tree, with species, girth, height and position. What that national list does not carry, anywhere in the country, is an age. Liguria is one of a handful of regions that keeps its own register alongside it, and its version does record one, which is why a hop-hornbeam at Villa Serra is the only tree here with a figure that came from a document rather than from arithmetic. The rest are estimates drawn from trunk circumference, and every entry on this page says so rather than presenting a number as a fact. Two trees rest on the register alone and are marked accordingly. The camphor on Via Romolo Gessi is the interesting case: at 734 centimetres round it is far thicker than comparable specimens found elsewhere in the city, which makes it either remarkable or a recording error, and nobody has published a second measurement either way.