A slightly woody vine. It climbs by means of tendrils and grows 3-15 m long. The stems are branched and angular and fleshy. They are 3-8 mm across. They are flexible and swollen at the nodes. The leaves are alternate and have 3 leaflets. The leaflets are oval and 1-6 cm long by 1-4 cm wide. The leaflets are unequal in the side leaflets. The flowering shoots are opposite the leaves. The flowers are reddish. The fruit are round and 4-5 mm across. They are black or purple when ripe. There is one seed 5 mm long.
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