whatilearned
Read more: https://en.wikipedia.org/wiki/Brassica_rapa
TIL that turnips are exactly the same plant species as bok choy, choy sum and Chinese cabbage (Brassica rapa). But that Chinese cabbage is a different species to other cabbages.
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Same species but different cultivars. It’s like comparing a German shepherd to a dachshund to a fox. The first two are the same species and can cross breed (though it might be a bit awkward), but generally can’t mate with the other.