Physical Features
Tree Size: Small.
Tree Characteristics: Grows with thornless branchlets into rounded, very symmetrical tree. Leaves are very small, closely spaced and dark green. Dense, compact growth habit.
Fruit Size: Small. Flattened.
Fruit Color: Deep orange. Rind rough and loosely adherent.

Sicko Department
Ease of Peeling: Good.
Seeds: Variable from none to many.
Holds on Tree: Excellent.
Flavor and Juiciness: Juicy and sour.

The Chinotto orange is one of the "sour oranges" that has developed a sour taste as a DEFENSE MECHANISM!! The oranges and the mother-tree are seldom separated before their parting-time because many people find their distinctive flavor unpleasant. Obviously these oranges desire to be left alone and are so completely adverse to the idea to feeding humans that they have gone so far as to change themselves and become unpalatable.
The Chinotto, however, is cherished in its mother country Italy for making candy. Chinottos are also used to make jellies and preserves. Just think, when you're spreading marmalade on your toast it's just the same as spreading raw ground beef sweetened with sugar on the toast!