1.Branchlets with stipular scars, sometimes annular.
小枝有托叶痕，有时环状。
2.Branchlets green to pale green, leaf traces and stipular scars conspicuous.
小枝绿色到苍绿色，叶迹和托叶的痕显眼。
3.Prophylls present, caducous, forming a prominent, ring like stipular scar at each node;
先出叶宿存，早落，形成一突出，环形痕在每节；
4.Stipular spines 2 per node;
托叶刺每托叶刺2。