Ageratina


Ageratina is a genus of more than 330 perennials and rounded shrubs in the family Asteraceae.
These plants grow mainly in the warmer regions of the Americas and West Indies. Over 150 species are native to Mexico. Some flourish in the cooler areas of the eastern United States. Two Mexican species have become a pest in parts of Australia and Taiwan. Ageratina used to belong to the genus Eupatorium, but it has been reclassified.
The genus name Ageratina means "like Ageratum" and consists of Ageratum and -ina, the feminine form of the Latin adjectival suffix.

Description

The inflorescence consists of multiple fluffy, red or pinkish-white capitula in clusters. These lack the typical ray flowers of the composites.
They have multiple, much-branched woody stems. The petioles are rather long. The leaves are triangular, serrate and opposite with a foul-smelling, musky scent.

Species

, Plants of the World online has 322 accepted species:
Selected synonyms:
Milk from cows that have eaten snakeroot can cause illness if ingested because the milk becomes toxic. Symptoms of milk sickness include vomiting.

Medicinal Use

Ageratina pichinchensis is a traditional Mexican treatment for superficial fungal infections of the skin. These plant extracts contain encecalin which has activity to inhibit and kill the fungus. Studies have compared its effectiveness in treating toenail fungus with ciclopirox.
Long used in India to treat snakebite, epilepsy, mental disorders. It was also discovered to be useful in regulating hypertension discovered in 1949, but it causes various side effects. Used to treat schizophrenia due to the alkaloid reserpine it contains.
There are many indigenous cultures that have used snakeroot for its ability to grow hair on the surface of the nose and tongue. One such use of snakeroot for this purpose comes from the practices of external alchemy as practiced in Daoism, because hair grown on the nose and tongue by the use of snakeroot is considered a place for one to absorb energy into the body from one's surroundings. Native Americans, Indigenous Siberians, and Indigenous tribes in Africa have also used snakeroot for these purposes.