i am thinking that maybe they are talking about brocoli rabe-- vs broccoli. (calabrese is brocoli rabe? or calabrese is broccoli? who knows!)

Broccoli has big, tight, heads of flower buds..and thick stalks.. (that can be pealed, and eaten as well.. )

brocoli-rabe looks like broccoli that is anorexic... it is thin stalks, with some big green leaves, and thin, flowerbuds.. it looks more like a spinach than a broccoli.

while both are members of the same family, they are very different... (as different as cauliflower is from cabbage!) they look different, they have different growing times, and the taste very different.. someone should go find some pictures of these things.. since clearly, we have only a vague idea of what we are all talking about!