For sure this isn't Clytostoma callistioges (what a mouthful!) It's quite lavender with purple veins and has a strange prickly pod rather than the thin flat one common to most bignoniaceae. (If I'm spelling something wrong, forgive me. Been a long day in the heat.) I'm dang certain this is Podranea ricasoliana, which is pinky pink, a bit more tropical than Clytostoma and its friends, Pandorea jasminoides.
They're all related. Bignoniaceae includes most trumpety things, trees as well as vines. Usually the seeds are flat and stacked like sardines inside a long, flat pod. They fly on the wind when the pod is ripe.
Campsis radicans has a 5" red and yellow bloom. It might be related, but it's an invasive nightmare (even in cold zones) whereas the rest like zones 9-11 and are fairly well behaved.
And just when you think you've got this nomenclature thing nailed, The Botonists decide to move something from one family into another. (How rude!) You mainly need to know what you have so you don't plant a tropical vine in Nebraska and be all sad when it snows. These are all perennials and don't reseed quickly like morning glories.
Here endeth the lesson. Clearly I need a nap.
And thanks woofie for pointing it out too. 
