Tendril unbranched or bifurcate. Inflorescence usually a polychasium. Seeds elliptic, obovoid-elliptic, or obtriangular, surface smooth, corrugated, or with strumose protuberance or ribs.

卷须不二叉。通常花序一多歧聚伞花序。子椭圆，倒卵球椭圆，倒三，平滑表面，具皱褶，具瘤状突起肋。