The five oblong Pachypodium succulentum petal lobes of each flower spread, recurve and rotate slightly in their upper parts. White on the plant in picture, the colour is added by the red purple central stripes on each lobe.
The stalked flowers have narrow corolla tubes, clutched at the back by short calyces, green and five-lobed. The tubular buds elongate conspicuously before they open, their outside surfaces dark red purple.
The few visible spines are long, thin and straight, the leaves among them narrow and shorter (Frandsen, 2017; Smith, et al, 2017; Vlok and Schutte-Vlok, 2015; Leistner, (Ed.), 2000; iNaturalist).