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The University of Delaware is studying lima beans. I copied a small detail from a photo. I have no clue how many different Lima beans are involved in the study, but from the photo it appears that at least one of the plants shows variegated leaves.
http://www.udel.edu/PR/UDaily/...
I don't like to eat Lima beans but the variegated leaves are very pretty.
I will look forward to the better answers from the experts. I'm done guessing.