Physalis melanocystis is a branching, woody-based shrublet native to the tropical and subtropical forests of Mexico and Central America, distinguished by clusters of axillary blossoms and spherical berries wrapped in dark, inflated husks. Its specific epithet melanocystis combines the Greek words melas (black or dark) and kystis (bladder), referring directly to the papery fruiting calyx that turns dark as it dries.
A member of the nightshade family (Solanaceae), the species was initially described in 1891 by Benjamin Lincoln Robinson as Withania melanocystis before German botanist Friedrich August Georg Bitter transferred it to the genus Physalis in 1924.
Unlike many herbaceous annual groundcherries, Physalis melanocystis develops a woody, branching framework clothed in short, unbranched trichomes—fine epidermal hairs that either spread outward or lie flat pointing toward the shoot tips. Its diploid chromosome number is 2n = 24.
As the fruit matures, the flower stalks elongate to 10–15 millimeters while the sepals fuse and inflate into an accrescent calyx—a protective papery lantern measuring 17 to 25 millimeters long and 15 to 18 millimeters wide. Inside this bladder sits a smooth, spherical berry measuring 10 to 13 millimeters in diameter.
Within its genus, Physalis melanocystis stands out for how its floral grouping and post-pollination calyx growth work together in humid Mesoamerican forest margins.
Its early placement in the genus Withania by Benjamin Lincoln Robinson was no accident: by grouping three to six flowers together in each leaf axil rather than spacing them singly, the plant creates a concentrated visual and nectar target for forest-understory bees. Once pollination is complete, the short flower stalks lengthen by up to fifty percent to give the swelling husks room to expand without crowding one another.
Taxon Synonyms: Withania melanocystis, Physalis porphyrophysa
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