Kalopanax septemlobus, common name prickly castor oil tree, is a deciduous tree in the family Araliaceae, the sole species in the genus Kalopanax. It is native to northeastern Asia, from Sakhalin and Japan west to southwestern China. It grows to 30 m tall, with a trunk up to 1-1.5 m diameter. The stems are often spiny, with stout spines up to 1 cm long.