Chaetachme is a monotypic genus of flowering plants native to eastern and western Africa, including Madagascar, containing the single species Chaetachme aristata. Its English language common name is thorny elm, and it is known as muyuyu in Gikuyu language. Traditionally placed in the Ulmaceae, it is more recently placed in the family Cannabaceae, thought to be possibly closely related to Celtis.
Chaetachme aristata is a shrub or small tree growing up to tall. It has drooping, angular branches covered with spines up to in length. The lance-shaped leaves are up to long by wide, pointed at the tip and smooth or serrated on the edges. The shrub is Plant sexuality and sexually dimorphic, with male and female flower types borne on separate individuals, although it may also be monoecious.
This shrub is host to the Miridae Volumnus chaetacme.
The spiny branches of the shrub are used as in African villages.