One may differentiate between kale varieties according to the low, intermediate, or high length of the stem, along with the variety of leaf types.
The leaf colours range from light green to green, to dark green and violet-green, to violet-brown.

Classification by leaf type:
Curly-leaf (Scots kale, blue curled kale)
Bumpy-leaf (black cabbage, better known by its Italian translation 'cavolo nero', and also known as Tuscan Cabbage, Tuscan Kale, lacinato and dinosaur kale)
Plain-leaf (flat-leaf types like red Russian and white Russian kale)
Leaf and spear, or feathery-type leaf (a cross between curly- and plain-leaf)
Ornamental (less palatable and tougher leaves)
Because kale can grow well into winter, one variety of rape kale is called "hungry gap" after the period in winter in traditional agriculture when little else could be harvested.
 An extra-tall variety is known as Jersey kale or cow cabbage.
 Kai-lan or Chinese kale is a cultivar often used in Chinese cuisine.
In Portugal, the bumpy-leaved kale is mostly called "couve galega" (Galician kale or Portuguese Cabbage).
One may differentiate between kale varieties according to the low, intermediate, or high length of the stem, along with the variety of leaf types. The leaf colours range from light green to green, to dark green and violet-green, to violet-brown.
Classification by leaf type:
Curly-leaf (Scots kale, blue curled kale)
Bumpy-leaf (black cabbage, better known by its Italian translation 'cavolo nero', and also known as Tuscan Cabbage, Tuscan Kale, lacinato and dinosaur kale)
Plain-leaf (flat-leaf types like red Russian and white Russian kale)
Leaf and spear, or feathery-type leaf (a cross between curly- and plain-leaf)
Ornamental (less palatable and tougher leaves)
Because kale can grow well into winter, one variety of rape kale is called "hungry gap" after the period in winter in traditional agriculture when little else could be harvested.  An extra-tall variety is known as Jersey kale or cow cabbage.  Kai-lan or Chinese kale is a cultivar often used in Chinese cuisine. In Portugal, the bumpy-leaved kale is mostly called "couve galega" (Galician kale or Portuguese Cabbage).
Kale