Isocarpha is a genus of five species of plants. They are native to Mexico, Central America, the West Indies, and northern South America, with the range of one species extending north into the United States.

Classification

Although it is generally assigned to the tribe Eupatorieae

Eupatorieae

Eupatorieae is a tribe of over 2000 species of plants in the aster family. Most of the species are native to tropical, subtropical, and warm temperate areas of the Americas, but some are found elsewhere...

, the flowers are unusual for that tribe. It is believed to have evolved from an ancestor which more closely resembles other Eupatorieae.