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Groups of cultivars of Brassica oleracea
Mabberley (q.v.) has these groups: Napobrassica Group / Pabularia Group / Acephala Group / Alboglabra Group / Botrytis Group / Capitata Group / Gemmifera Group / Gongylodes Group / Italica Group / Tronchuda Group / Chinensis Group / Japonica Group / Pekinensis Group / Perviridis Group / Rapifera Group
Royal Botanic Gardens Kew has eight groups: Acephala Group (kale, borecole, collards) / Alboglabra Group (Chinese kale, Chinese broccoli, gai laan, kai lan) / Botrytis Group (broccoli, cauliflower, broccoflower, calabrese) / Capitata Group (cabbage, savoy cabbage, red cabbage) / Gemmifera Group (sprouts, Brussels sprouts) / Gongylodes Group (kohlrabi, knol-kohl) / Italica Group (purple sprouting, sprouting broccoli) / Tronchuda Group (Portuguese cabbage, seakale cabbage)
giant Jersey cabbage, long jack, walking-stick cabbage, cow cabbage, Jérriais lé grand chour à vaque [i.e., big cabbage for cows], Jérriais lé chour [i.e., cabbage],tree cabbage, or Jersey kale, or Brassica oleracea longata The long woody stems are used for walking-sticks and the foliage for cow-fodder.
^(Quote.) "Originally, a general name for any plant of the cabbage kind, genus Brassica (of which the varieties were formerly less distinct than now)." ("colewort, n." OED Online. Oxford University Press, September 2014. Web. 26 November 2014.)