Unidentified flowering object

I wanted a shrub to go under my kitchen window. And I wanted it to be fragrant, so the "sweet scent of summer could waft into the windows" as I washed the dinner dishes.

I spent hours pouring over plant catalogs determining which woody would be the just the right size and just the right shape and that would bloom at just the right time and in just the right color.

I finally found what I was looking for: Philadelphus 'Innocence' -- the most fragrant of all the mockoranges with simple, single, pure white flowers in June. Lovely!

I scoured the nurseries until I found a beautiful specimen, took it home, and lovingly placed it in a well-amended, twice-the-diameter-of-the-pot hole under the window. And then I waited. Two whole years I waited. Finally, this year, a bloom -- or to be more precise, a panicle -- a cone-shaped, oakleaf hydrangea-looking panicle.

WHAT!!!

Turns out I'd waited two years only to discover that I'd purchased a mislabeled shrub. I still don't know what it is. It's not an oakleaf hydrangea, this much I know. In fact, it's not any hydrangea that I've ever seen. Its leaves are narrow and pointed and stiff. Not soft. And its stems are twiggy-er than a hydrangea. It also doesn't wilt when hot or dry.

Oh, and did I mention that it has ABSOLUTELY NO FRAGRANCE?

If anybody knows what this shrub could be, I'd love to hear from you. I'm only keeping it because I'm afraid that it will turn out to be some new species and, the minute I dig it up and toss it into the chipper shredder, someone will inform me that I could have patented it and made millions of dollars...

P.S. The white flowers have now changed to pink -- again like an oakleaf hydrangea.