Stalking the Rare Horsteria Westnut

What kind of tree could this be, so bright and fragrant a week or two ago,

with two kinds of flowers--some white, some lavender? Closer inspection showed it to be a horsteria westnut, that is, a horse chestnut being engulfed by wisteria vines.

If one's going to kill a tree--the likely outcome--this is one of the prettier ways to do it.