Physochlaina is a small genus of herbaceous perennial flowering plants belonging to the nightshade family, Solanaceae, found principally in the north-western provinces of China although one species occurs in Western Asia, while another is found as far east as those regions of Siberia abutting the eastern borders of Mongolia and, furthermore, not only in Mongolia itself, but also in the Chinese autonomous region of Inner Mongolia. Some sources maintain that the widespread species P. physaloides is found also in Japan, but the species is not recorded as being native in one of the few English-language floras of the country. The genus is a valuable one, since its species are not only of considerable medicinal value, being rich in tropane alkaloids, but also of ornamental value, three species having been grown for the purpose, although hitherto infrequently outside botanical gardens. Furthermore, the genus contains a species formerly used as an entheogen in Siberia.

Gümüşhane is a city in the Black Sea Region of Turkey. It is the seat of Gümüşhane Province and Gümüşhane District. Its population is 39,214 (2022). The city lies along the Harşit River, about 40 miles (64 km) southwest of Trabzon. The city lies at an elevation of 1,153 m (3,783 ft).