Young stems terete to frequently 4-angled or subalate, glabrous, puberulous, pubescent, or tomentose, often glabrescent.

嫩茎圆柱状到经常地或略似翼的，无毛，被微柔毛，短柔毛，或被绒毛的，通常后脱。

This gland is located on the distal end of spermatophore cyst, and shaped like a semicylinder which consists of many acini.

促雄性腺位于精荚囊末端，半圆柱状，由许多腺泡组成，细含粗面质网和高尔基氏体，推测其分泌蛋白质性质的激素。