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

嫩茎状到经常地四棱形或略似翼的，无，被微，，或被绒的，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，状，由许多腺泡组成，细胞内富含粗面内质网和高尔基氏体，推测其分泌蛋白质性质的激素。