Does not spread by seed, but is expanding vegetatively. One of those plants that's in the grey area of naturalized vs. cultivated.
Large leaves, very distinctive flowers
Sparrmannia africana (African hemp, African linden) is a species of flowering plant in the Tiliaceae family, native to open woodland in Africa, South Africa and Madagascar. It is one of up to seven species in the genus Sparrmannia. The Angiosperm Phylogeny Group places this genus within the Malvaceae family.