Collard is a group of loose-leafed cultivars of Brassica oleracea, the same species as many common vegetables including cabbage and broccoli. Part of the Acephala (kale) cultivar group, it is also classified as the variety B. oleracea var. viridis.
A bundle of collard greens
Young collard plants.
A field of collard in Pennsylvania
Caldo verde, a popular Portuguese soup made with collard greens
Brassica oleracea is a plant species from family Brassicaceae that includes many common cultivars used as vegetables, such as cabbage, broccoli, cauliflower, kale, Brussels sprouts, collard greens, Savoy cabbage, kohlrabi, and gai lan.
Brassica oleracea
Head of B. oleracea Botrytis group (cauliflower) growing
Couve Galega (ex. Brassica oleracea var. acephala DC.) for the Portuguese Caldo verde
Jersey cabbage can be cultivated to grow quite large, especially in frost-free climates.