Sinningia cochlearis is closely related to S. gigantifolia.
Because S. gigantifolia has a wider geographical range, and the range of S. cochlearis is contained within that of S. gigantifolia, Perret et al. conclude that S. cochlearis has evolved from within S. gigantifolia with specialization for a particular type of environment (open highlands rather than highland forest).
Note that the fragment of leaf visible in the photo has an apparently scalloped edge. This is characteristic of the species.