To ID Wahlenbergia to species level, you need to provide good photos of the flower front on and side on, some stem + at least two whole leaves, and if possible the whole plant. Whole plants nearly always fade into the background, so I suggest something black as a background. Don used black velvet. A black t-shirt is nearly as good. Also a measure of flower size is helpful for some species. I suspect this is either multicaulis (usually smaller flowers) or planiflora (usually larger flowers) because it appears that the free lobes of the flowers might be more than four times the length of the base. This Is where the sideways photo helps. Plus flower size, which might be enough to make a decision one way or the other. The clincher for telling which of the two species this is, is a photo of a reasonably mature seed case!