Monochaetum is a neotropical genus of shrubs and subshrubs with about 54 species. It occurs in warm temperate to tropical montane habitats from Mexico and Central America to the South American Andes of Colombia, Venezuela, Ecuador, and Peru with one species reaching the Guayana Highlands of Venezuela and Guyana.

Monochaetum is characterized by its tetramerous flowers, prevailingly dimorphic stamens with dorsally appendiculate anthers, capsular fruits that are free from the hypanthium, and cochleate seeds.

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