Angular winter cherry

Physalis angulata is an erect, herbaceous, annual plant belonging to the nightshade family Solanaceae. It reproduces by seed. Its leaves are dark green and roughly oval, often with tooth shapes around the edge. The flowers are five-sided and pale yellow; the yellow-orange edible fruits are born inside a balloon-like calyx. It is native to the Americas, but is now widely distributed and naturalized in tropical and subtropical regions worldwide.
It was spotted growing in a house garden, in Tzoumerka mountains, Epirus region, Greece.