There are several varieties of radicchio; each type is named after the
region of Italy where it was originally grown. The most common radicchio
is the deep-red to burgundy radicchio rosso, also known as radicchio di
Verona.
Radicchio di Verona, rosso di Verona, or red Verona chicory is
shaped like a cabbage rose, it has shiny, smooth leaves with white ribs
and veins.
Radicchio Rosso di Treviso -
cultivated in Italy since the 16th century Rosso di Treviso
is a spear-shaped
radicchio that ranges in color from pink to deep red with serrated
leaves that grow straight upwards to a height of 20 centimetres. The tips of
the leaves tend to fold in towards each other and enclose the tuft from
above. After the forcing operation, the ribs of the leaf are extremely
white, while the leaf itself is smooth and carmine red. The final result
is a leaf with a faintly bitter taste and a crunchy texture. The
production area encompasses many town districts in the provinces of
Treviso, Padua and Venice.
Two other varieties you may find at a specialty market are radicchio
di Castelfranco and radicchio di Chioggia. They're similar in size,
shape, and flavor to Verona radicchio but have looser, larger heads of
slightly crinkled leaves, which range in color from green to pink to
variegated red and white.