I think I'll sow both again next year and see whether there is indeed some line segregation going on or whether they really are two distinctly different varieties with similar seeds that each breed pure, and have been mixed by accident. I'll pay more attention to flower colour, height, shape and length of pods etc. so I can then ask the people who offer them specifically about these things. So far, I agree with what you think - that the softer, round, short pods are probably the "real" striped bunch.
Phaseolus vulgaris doesn't cross all that easily. It is possible, but rare. I was given a mix of six very different varieties of dwarf french beans, with six different seed colours: black, white, yellow, red, brown and violet. The lady who gave me them has been growing them for decades in her garden, and she always sows them in the one and the same long row, all mixed up. As far as I can tell from growing them separately this year, no crossing has occurred at all. Each colour was uniform in height, pod shape etc, and all the seeds I harvested were the same original colour again. Fascinating.
Tennessee Greasy: 70 days. A true mix. I've tried for over 10 years to segregate this. I've concluded that it is a true mixture. Seeds are various colors as well as having pods of various shapes and textures. Beans can be used both in the green snap stage and dried for soup. Ornamental and colorful.
Sand Hill Preservation Center: Beans (Snap, Shell, Soy, Lima and Miscellaneous types)
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