These twin star flowers occur in pairs often enough to warrant the specific name of geminatus (Latin), meaning repeated or having been done again.
The corolla of this Piaranthus species has no tube, its five lobes spreading widely. Their margins curve down and taper to acute tips. Corolla lobes are not always straight as seen here; they may curve back or be reflexed further, otherwise curving in when flowers have recently opened. Velvety hairs are found on the inner surfaces (on top) of the corolla lobes, their outside surfaces hairless. The inner corolla surface is pale yellow, dotted red. Flower diameter is about 2,5 cm (White and Sloane, 1937; Vlok and Schutte-Vlok, 2010).