Nope. No ideas. Do you have any?

Jim

Lmao. Maybe it was a jicama!.

Nope, - no ideas here. :)

There is a white-seeded Hyacinth bean (Dolichos lablab). Usually the flowers are white as well. Very invasive as you found out and it often only starts to flower in its second year. I think it is mainly used in Chinese medicine.
I am adding a link to the white lablab.
Rose-Marie

Here is a link that might be useful: White Hyacinth bean

Rose-Marie, you might have something there! Maybe it didn't bloom because it was going to bloom the next summer. Hummmmmmm. :) Arum

I agree with Rose-Marie; the description of the plant & seed seems to match. Hyacinth beans are long season, perhaps even daylength-sensitive (which is why mine bloomed in September?). This might explain the lack of blossoms.

Now don't get me wrong, I DO have a white variety that is fragrant, and takes a short season to do what it does, it's just that this one weird bean acts so differently, that I think it's and from another planet. :)

Zeedman has given a good scientific point of view.If you rule that out then another possibility is that there may be too much Nitrogen in the soil.Try to remove Nitrogen by planting corn first and after harvesting corn, plant the bean to see if that is the reason.