Winged Bean: Square
(Psophocarpus tetragonolobus)

Winged bean is a climbing, nitrogen-fixing, short-lived perennial vine usually grown as an annual. The pods, beans, leaves, tubers, and flowers of this plant are all edible.  It thrives in hot, humid areas where other beans are more likely to succumb to plant diseases.

Produces pods that are square shaped rather than flat. It has good tuber production during shorter, cooler days.  A short day flowering variety (daylength sensitive).