Wow Donna...I don't think I have seen a white flower so wonderfully...congratulations...
Amathest Falls is a summer blooming American wisteria
Growing them together is great..I had a purple and a white at the ends of a couple of 25 ft cables purple on one side and white...as they met there was purple and white together...but they wanted as much green growth as they could have so they refused my pruning it..it soon gave it's growth closer to the roots...and above became a mat killing the part of the vine below and inside the mat...good luck with a three color display