Zanthoxylum simulans (Chinese-pepper, Chinese prickly-ash or flatspine prickly-ash), is a flowering plant in the family Rutaceae, native to eastern China and Taiwan. It is one of several species of Zanthoxylum from which Sichuan pepper is produced (see that page for uses).It is a spreading shrub or small tree growing to 7 m tall. The leaves are 7-12.5 cm long, pinnate, with 7-11 leaflets, the leaflets 3–5 cm long and 1.5–2 cm broad.