Branchlets terete, with longitudinal ridges, transversely corrugated when dry, pubescent, then glabrescent;tendrils unbranched.Leaves pedately 5-foliolate;

• 小枝圆柱状，带有纵脊，干燥时横向皱，短柔毛，后脱落卷须不分枝叶鸟足状具5小叶；