The flower of the Swartberg indigo as Indigofera nigromontana is commonly known, is brightly coloured in pinkish purple petals.
The banner petal at the top, visible veins across its surface, is bluer purple than the (redder) wings meeting chastely below it, concealing the keel. The incurving upper margin of the banner discloses a little of the hairiness of its outer surface.
The buds in picture are hairy on the outside of their pointed calyx lobes that reach halfway up each bud. The top part of the bud is the folded and pointed corolla protruding from its clutching calyx. It is also hairy to its tip, the outer surface of the banner petal (Vlok and Schutte-Vlok, 2010; Le Roux, et al, 2005; iNaturalist).