| Montanoa tomentosa | |
|---|---|
|   | |
| Montanoa tomentosa var. xanthiifolia | |
| Scientific classification   | |
| Kingdom: | Plantae | 
| Clade: | Tracheophytes | 
| Clade: | Angiosperms | 
| Clade: | Eudicots | 
| Clade: | Asterids | 
| Order: | Asterales | 
| Family: | Asteraceae | 
| Tribe: | Heliantheae | 
| Genus: | Montanoa | 
| Species: | M. tomentosa | 
| Binomial name | |
| Montanoa tomentosa | |
Montanoa tomentosa is a species of flowering plant in the family Asteraceae which is native to Mexico and much of Central America. Its local common name is zoapatle. This small yellow-flowered shrub is best known for its use in traditional herbal medicine.
|  | This section needs more reliable medical references for verification or relies too heavily on primary sources .(September 2015) | 
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. [1] [2] The related species Montanoa frutescens has similar effects in rats, but is much more likely to have contraceptive effects by causing structural changes in the endometrium. [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). [4]