Fischer, E. (1999) Scrophulariaceae Flore d'Afrique Centrale (Congo-Kinshasa, Rwanda & Burundi) Jardin Botanique National de Belgique, Bruxelles
Description of the genus
Shrubs or trees. Leaves glabrous, opposite, petiolate. Flowers in axillary clusters, often appearing on old wood. Calyx 3-5-lobed,
persistent. Corolla with 4-5 lobes, lobes short in relation to the tube. Stamens 4, exserted. Staminode 0. Style exserted, persistent. Fruit a berry.
Derivation of name: after Albrecht von Haller, 1708-1777, professor of botany, Göttingen.
Worldwide: 4 species in tropical and southern Africa and Madagascar.