Wikipedia:
Kale or borecole is a form of cabbage (Brassica oleracea Acephala Group), green or purple, in which the central leaves do not form a head. It is considered to be closer to wild cabbage than most domesticated forms.
The species Brassica oleracea contains a wide array of vegetables including broccoli, cauliflower, collard greens, and brussels sprouts. The cultivar group Acephala also includes spring greens and collard greens, which are extremely similar genetically.
Move over Popeye and make room for the "queen of greens," Kale. Gaining in popularity, Kale is an amazing vegetable being recognized for its exceptional nutrient richness, health benefits, and delicious flavor.
Eating a variety of natural, unprocessed vegetables can do wonders for your health, but choosing super-nutritious kale on a regular basis may provide significant health benefits, including cancer protection and lowered cholesterol.
Kale, also known as borecole, is one of the healthiest vegetables on the planet. A leafy green, Kale is available in curly, ornamental, or dinosaur varieties. It belongs to the Brassica family that includes cruciferous vegetables such as cabbage, collards, broccoli, and Brussels sprouts.
What makes Kale so exceptional? Here is why it's a superstar vegetable -- and ways to work it into your diet.