Rhizome of Lalang Grass Classic Formulas … Natural Herb Library

Primary Actions

Cools blood and stops bleeding ... Mao Gen is classically used for hematuria, nosebleed, hemoptysis, and other bleeding driven by heat in the blood.
Clears heat and promotes urination ... it treats painful urinary dribbling, damp-heat urinary irritation, edema, and heat strangury, especially when bleeding is also present.
Clears Lung and Stomach heat and generates fluids ... traditional use extends to cough from Lung heat, vexing thirst, vomiting from Stomach heat, and recovery fluids depleted by heat.

Mao Gen Yin Zi ... classic formula context for hematuria and blood strangury with both heat and deficiency components.
Mao Gen with Xiao Ji, Ce Bai Ye, or Di Yu ... common hemostatic pairing style for upper- and lower-body bleeding with heat signs.
Fresh Mao Gen juice or single-herb decoction ... traditional emergency-style use for blood-heat bleeding or severe thirst from heat.

Traditional references describe Mao Gen as sweet and cold, entering the Lung, Stomach, and Bladder to cool blood, stop bleeding, clear heat, and induce diuresis.
The main naming difference from Bai Mao Gen is usually editorial or marketplace emphasis rather than a different medicinal identity.