ground cherry

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of various plants of the genus Physalis in the nightshade family, chiefly of the Americas, having small, globose, fleshy fruit enclosed in a papery, bladderlike, persistent calyx.
• noun The fruit of any of these plants.

from The Century Dictionary.

• noun A plant, Prunus (Cerasus) Chamæcerasus, with smooth shining leaves and spherical acid fruit, sometimes found in gardens budded on the common cherry. See cherry, 1.—2. An American plant of the genus Physalis.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun any of numerous cosmopolitan annual or perennial herbs of the genus Physalis bearing edible fleshy berries enclosed in a bladderlike husk; some cultivated for their flowers