A rare new species of the genus Wiborgiella (Crotalarieae, Fabaceae)

•The new species Wiborgiella argentea is described.•This is a rare species of conservation concern from the Robertson area in the Western Cape Province.

The new species Wiborgiella argentea is described. It is closely similar to Wiborgiella leipoldtiana and W. fasciculata but differs in its single-stemmed habit, densely sericeous leaves, wing petals that are longer than the keel and details of the fruit. It is known from the Robertson area where it occurs in Robertson Karoo, on rocky, south facing shale slopes.