Deciduous shrub, c. 3.5 m tall. Leaflets sessile, 22-40 x 10-20 mm, obovate to ovate, crenate, often emarginate. Floral buds scaly. Flowers almost sessile, Calyx 5-segmented. Petals 2 mm, obovate, shortly clawed. Stamens 20-23, free. Ovary 6-7-locular. Rind orange, rough, finely pubescent. Pulp greenish, acidic and oily. Seeds glabrous.

Fl. Per.: March-April.

Type: Probably described from Japan.

Distribution: Japan & N. China.

Trifoliolate orange is usually cultivated as an ornamental. A hardy plant and quite resistant to cold, it is used as a root stock for grafting other citurs fruits. The summer flower buds are protected by scales through winter and bloom in the spring before the leaves appear. (Bailey, l.c.).