Betula costata

Betula costata is a climbing shrub with stems that have white interiors and developed, round adventitious roots. Leaves are typically deciduous, though occasionally evergreen. The leaves are either trifoliate or palmately compound. Flowers are small, with five (or four) petals, and are borne on long petioles in corymbose or panicle inflorescences, either opposite the leaves or at the ends of branches. The flowers are unisexual, occasionally polygamous. The ovary has two styles, each bearing two ovules. The fruit is a dark blue-black nut, containing one to four seeds.