Chinese Wing Bean – Identification

Q: In the garden, next to my Tahitian long beans, we planted another seed that looked like a kidney bean. But what grew doesn’t look like any kidney bean I am familiar with. Any idea what these are?

A: It’s a Chinese wing bean. According to San Diego Food Stuff,  the entire plant edible–not just the pods, but also the shoots, leaves, flowers, and seeds. Even the tubers, although they’re very small.