Ramie Root Classic Formulas … Natural Herb Library

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Cools blood and stops bleeding ... Zhu Ma Gen is used for heat-driven uterine bleeding, hematuria, and other bleeding patterns where blood heat disturbs the lower burner.
Clears heat and promotes urination ... it is selected for difficult or painful urination, urinary heat, and edema with a heat component.
Calms the fetus when heat disturbs pregnancy ... traditional use includes restless fetus or threatened bleeding presentations attributed to internal heat.

Heat-bleeding combinations pair Zhu Ma Gen with Di Yu or Ce Bai Ye for uterine or urinary bleeding with a clear heat component.
Urinary-heat patterns combine it with Che Qian Zi or Bai Mao Gen when the goal is to cool, drain, and stop blood in the urine.
Threatened-pregnancy heat patterns pair it with Huang Qin or Bai Zhu when the treatment goal is to cool without over-dispersing.

Traditional materia medica describes Zhu Ma Gen as sweet and cold, able to cool blood, stop bleeding, promote urination, and calm the fetus.
The medicinal identity is the root of ramie, a plant better known outside medicine for fiber production, so source part matters.