Now, there's some debate on the species classification of the genus Edgeworthia. Dan described this dilemma in an article on his website.
Still not sure exactly what we saw in the wild. It looks like E. papyrifera based on the plants labeled as such at specialty nurseries here, but Scott labeled it as E. chrysantha.
This form has an exquisite pink blush at the base of the corolla and it is exquisitely fragrant. It has also proven to be quite hardy.