Kurokongo was originally found as a mutation among the seedlings of an Amami plant. It looks similar to Tamakongo but it gets strong anthocyanin pigmentation in comparison. If you grow it in high light, it will become strongly pigmented with black streaks and spotting.
Tenjin, I personally have not heard about before, but a bit of research on the Japanese sources seems to say that it is the result of a cross between two bean leaf varieties, Junihitoe and Tenzan. I think it's supposed to have green root and green stem.
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