Indigofera is a large genus of over 750 species of flowering plants belonging to the family Fabaceae. They are widely distributed throughout the tropical and subtropical regions of the world. Species of Indigofera are mostly shrubs, though some are small trees or annual or perennial herbs. Most have pinnate leaves. Racemes of flowers grow in the leaf axils. Most species have flowers in shades of red, but there are a few white- and yellow-flowered species. The fruit is a legume pod of varying size and shape.

Indigofera tristoides is a South African indigenous slender-stemmed shrub. It is found in the Free State, Gauteng, KwaZulu-Natal, Limpopo and Mpumalanga provinces. The leaves vary greatly in size according to the rainfall, sometimes tufted on condensed short shoots.