Montanoa tomentosa is a species of flowering plant in the family Asteraceae which is native to Mexico and much of Central America.

This small yellow-flowered shrub is best known for its use in traditional herbal medicine.

In Mexico, there is a history of the use of M. tomentosa as a traditional remedy for sexual dysfunction.

An extract of the leaves was also used to start uterine contractions to induce menstruation, abortion, and labor, and to slow postpartum bleeding.

[3] At traditionally medicinally used amounts (75 mg/kg), M. tomentosa increased expression of sexual and mounting behavior in sexually active male rats and also in genitally anesthetized rats which were previously sexually inactive (noncopulators).