Achotillo

Achotillo is a common name used in several Latin American countries, primarily Mexico, for various plants belonging to the Karwinskia genus, particularly Karwinskia humboldtiana. It is also occasionally applied to other plants with similar fruits or characteristics.

Karwinskia humboldtiana, also known as coyotillo, tullidora, or cacachila, is a shrub or small tree native to Mexico and the southwestern United States. It is known for its small, dark purple or black fruits which are highly toxic, containing toxins that can cause paralysis and other neurological damage. Livestock and humans, particularly children, have been poisoned by consuming these fruits.

The plant is characterized by its opposite, elliptical leaves and clusters of small, greenish-white flowers. It thrives in arid and semi-arid environments. Due to its toxicity, it is generally considered a nuisance plant in agricultural areas.

The name "achotillo" may also refer, less commonly, to other Karwinskia species or plants with somewhat similar fruits. Care should be taken to properly identify the plant before handling it, especially when small, dark berries are involved.