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Physalis (Solanaceae) is a genus of about 75 species. It is the center of a group of genera informally called “physaloid”. All the physaloid genera share an accrescent fruiting calyx. Boundaries between Physalis and the other physaloid genera are obscured by the presence of some “atypical” species in Physalis that fall outside the typical concept developed for that genus. While most species in Physalis are herbs, have single flowers, an entire corolla that is rotate or open campanulate, and a fruiting calyx that is closed at the mouth and invaginated at the base, atypical species may have a combination of the following states: shrubby habit, fasciculate inflorescences, lobed, urceolate or tubular corollas, and a fruiting calyx that is open or partially open at the mouth and lacks the invagination at the base. A cladistic analysis of 27 morphological characters of physaloid genera suggests that atypical Physalis do not form a monophyletic group, and that P. amphitricha and P. calidaria should be removed. The remaining atypical species formed an unresolved clade with other species of Physalis.