A genus of deciduous, unarmed climbers or shrubs, with alternate leaves prominently and numerously parallel-veined. Flowers small, with five sepals and five petals, and not ornamental. Fruit fleshy, with a two-celled stone. Five species have been introduced: one American, the others Asiatic. They like a good, moist soil and can be propagated by cuttings. Allied to Zizyphus and Paliurus, both of which differ in having three-nerved leaves.