Tom, the first name is actually the genus. The second name is the species, usually a descriptive word (colour, appearance, growth habit, location found, discovered by, etc.). The cultivar (CULTIvated VARiety), eg. "Cherry Belle" radish, is what we call specific varieties of our garden plants. To determine which of your veggies belongs with which, I think you would have to go back to the Family or Subfamily. The Brassicas are a rather widely distributed clan, cabbages, broccoli, cauliflower, kale, kohl rabi, Brussels sprouts, rutabaga, turnips. I like to keep them together because they seem to fall prey to the same insect pests and it's easier to cover them all with Reemay for protection when they're close together.
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