Buckwheat Banana Bread (optionally gluten-free!)

So this has come up in a number of contexts and I figured I might as well just globally post the recipe once for everyone.

This is the canonical banana bread of my people, or at least of me -- it's what my mom always made when I was a child, and generally what I still make today. The recipe card I copied it off of says that it's from Southern Living magazine, probably in the late 1970s or very early 1980s; it has accreted annotations since then.

( Recipe behind cut-tag )