Cabbages, Brussels sprouts, kohl rabi, cauliflower, broccoli, and kales. This is an ancient domestication, and many of these crops were known to the ancient Romans. It is a complex species probably derived from three wild species with a presumed doubling of chromosome number, followed by the loss of some chromosomes. The species is open-pollinated and requires recurrent mass selection, although some self-pollination occurs with sprouts, cauliflowers, and kohl rabi. Most of the crops are biennials and breeding by amateurs is feasible although some specialist help will probably be needed. Calabrese, a sprouting broccoli, is B. olearacea var. italica, and it has recently become popular in North America. Brassica oleracea var. gemmifera
Brussels sprouts. See under: Brassica oleracea. Brassicas
Members of the Brassica genus of the Crucifereae family, includes broccoli, cabbages, canola, cauliflower, kale, kohl rabi, rape seed, sprouts, turnip, and various mustards. The taxonomy of the various species is confused, and the names given here may not coincide with other accounts.
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