Hm, any chance of a picture of a mature whole plant? The growth habit and mature size give hints. Might be a Xanthosoma? They are very common here, growing wild in the ditches if they get loose. My neighbor has a whole ditch full of them and they look a lot like that.
Hopefully Evan or Drew will know better than me. Or if
@LariAnn happens by, she is the authority.
