Tessmannianthus is a genus of flowering plants in the family Melastomataceae.

They are medium to large trees up to 40 meters (130 ft) tall.

The flowers are heterantherous, bearing two types of stamens.

[1] The genus name of Tessmannianthus is partly in honour of Günther Tessmann (1884–1969), a German-Brazilian ethnologist and botanist.

He was also an African explorer and plant collector, who later settled in Brazil.