Physochlaina
Physochlaina is perennial herbs, differing in their type of inflorescence – a terminal, cymose panicle or corymbose raceme. Flowers pedunculate. Calyx lobes subequal or unequal; corolla campanulate or infundibuliform, lobes subequal or sometimes unequal, imbricate in bud; stamens inserted at the middle of corolla tube; disk conspicuous; fruiting calyx lobes nonspinescent apically, fruiting calyx inflated, bladder-like or campanulate, loosely enclosing the capsular fruit. Fruit a pyxidium. Pollen grain polymorphic, usually subspheroidal, oval in polar view, circular-triangular in equatorial view. This genus includes about 6 species. Physochlaina is 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.