Ammon Martin's groundcherry

This was the ground cherry I've grown that was the largest on its first year, and the second-sweetest on its first year. It's supposed to be the frosty-hardy Physalis heterophylla Nees, but I don't think it is. It didn't grow back, and it looked and tasted much like Aunt Molly's and Goldie. I'm guessing it's Physalis pruinosa.