Psammisia sophiae. A Floral buds (top view) showing the distal ribs of the white corollas, which are magenta between the ribs B Top view of the inflorescence showing a flower at anthesis C Side view of the inflorescence showing a flower at anthesis D Branch with leaves, inflorescences and a detail of the pulvinate petioles. [Photos by P. Pedraza-Peñalosa.]