I entered this forum while trying to determine a correct botanical name for a bignoniaceous plant on The Plant List. In this venue, the Google images led me to photos posted by the UBC Botanical Garden and a thread started some years ago by someone named Miriam. The plant I am working with was acquired from the Hortus Botanicus botanical garden in Amsterdam, back in 1976, where it had the label Bignonia argyreoviolescens. We've grown it here in Hawaii since then, and a few years ago it flowered (I'll try to upload an image). The flower is clearly related to Dolichandra unguis-cati (syn. Macfadyena unguis-cati), and the foliage and tri-clawed tendrils are much the same. The only difference is in leaf coloration with the silvery veins and purplish tinges on the upper surface and dark undersurface. Whether this is a different species or merely a variant is not clear as IPNI does not list a species argyreoviolescens for Dolichandra or for Macfadyena.