Chaetachme is a monotypic genus of flowering plants native to eastern and western Africa, including Madagascar,[3] containing the single species Chaetachme aristata.

Its English common name is thorny elm,[4] and it is known as muyuyu in Kikuyu.

Chaetachme aristata is a shrub or small tree growing up to 10 metres (33 ft) tall.

It has drooping, angular branches covered with spines up to 3.5 centimetres (1.4 in) in length.

The shrub is dioecious and sexually dimorphic, with male and female flower types borne on separate individuals,[3][6] although it may also be monoecious.