Brassicaceae family(Brassica oleracea var. acephala)
Brassicaceae family
Collards (left, above) and kale (left, above) differ from one another by the leaf shape; the former have smooth leaf margins, while the latter's are generally crinkled. Collard greens are a popular vegetable in the southern U.S. Collards and kales are considered more primitive forms of the other cole crops, namely, broccoli, Brussels sprouts, cabbage, cauliflower, and kohlrabi. The name "acephala" means "without a head", although collards and kale will produce a seed head during the second growing season, being biennials.