Lalang Grass Rhizome Classic Formulas … Natural Herb Library

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Cools blood and stops bleeding - Bai 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 stranguria, 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.
Bai 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 Bai Mao Gen juice or single-herb decoction - traditional emergency-style use for blood-heat bleeding or severe thirst from heat.

Traditional references describe Bai Mao Gen as sweet and cold, entering the Lung, Stomach, and Bladder to cool blood, stop bleeding, clear heat, and induce diuresis.
The Shen Nong Ben Cao Jing lineage preserves it as a longstanding non-toxic grass-rhizome medicinal rather than a modern folk invention.
Bai Mao Gen should be distinguished from Lu Gen: both clear heat and generate fluids, but Bai Mao Gen is much more bleeding- and urinary-heat oriented.