Zanthoxylum piperitum, also known as Japanese pepper or Japanese prickly-ash is a deciduous aromatic spiny shrub or small tree of the citrus and rue family Rutaceae, native to Japan and Korea.

Sichuan pepper, also known as Szechuan pepper, Szechwan pepper, Chinese prickly ash, Chinese pepper, Mountain pepper, and mala pepper, is a spice commonly used in Sichuan cuisine in China, in Nepal, and in northeast India. Despite its name, Sichuan pepper is not closely related to black pepper or chili peppers. It is made from plants of the genus Zanthoxylum in the family Rutaceae, which includes citrus and rue.