Keetia gueinzii is an evergreen scandent shrub in the Rubiaceae family. The species epitheton is named after Wilhelm Gueinzius, a German naturalist who collected plants in South Africa. It became the type species of Keetia after the original type species, Keetia transvaalensis, was made a synonym. This species is found down the southern African east coast in Malawi, Zimbabwe, Mozambique and South Africa.