Please verify what I THINK I know about this first (blue) clematis, the closest match I could find is HF Young. I have no idea what the white clematis is. They both begin blooming anytime from April to May (depending on the winter/spring temps) and again in late summer (the blooms are much smaller). Both bloom on new growth. Thanks all.
kwanjin - thanks for the good advice... You are right about Miss Bateman (of course!) and the other has been identified (YAY!) as H.F.Young. If I could just lay off my nasty habit of buying raggedy, nameless foundlings... :>)