found: Web. 3(collard, usu. used in pl.)
found: Random House(collard, variety of kale, Brassica oleracea acephala, grown in the southern U.S.; collards. Also called collard greens)
found: Bio. & agr. index:v. 43, p. 464 (collards see Kale) p. 1195 (kale; bibl. entries: kale, collards, Brassica oleracea var. acephala, collard cultivars)
found: Hortus 3:p. 295 (collard, a large kale, Brassica oleracea Acephala Group)
found: Peirce vegetables:p. 201 (kale and collards, in U.S. collard is popular in southern diets, while the use of kale is much more widespread; B. oleracea, Group Acephala, collards are characterized by broad, flat, or slightly furrowed leaves)
found: Taylor's guide vegetables & herbs:p. 322 (collards: B. oleracea Acephala Group; though similar to the very closely related kale, collards taste slightly different and are preferred across the South)