Abacus tree is hardy in winter. Abacus bonsai is a relatively cold-tolerant plant. Abacus, also known as wild pumpkin, is an upright shrub or small tree. Branchlets, leaf undersides, ovaries and fruits are all pubescent. Leaves papery, ovate. Blooms in summer, monoecious. Stamens 3. There are 8 to 10 rooms in the ovary. The capsule is oblate and spherical, like an abacus bead, with 8 to 10 longitudinal grooves. A specialty of China, it is distributed in East China, South China, Southwest China, Gansu, Shaanxi and other places. Scattered in hills, mountains, and shrubs on sunny slopes, it is an indicator plant for acidic soil.