One I'd never noticed is that beautyberry (callicarpa) flowers have a delicate fragrance.
Grown for stunning purple fall berries, beautyberry is not a significant plant for blossoms.
When I investigated the fragrance I noticed as I bent over to turn on a faucet,
I also noticed the foliage has that acrid odor when crushed, like lantana, in the same family.
Another delicate fragrance sometimes overlooked is the sweet smell of crape myrtle blooms.
Not all smell as good as others. The crape myrtle that used to be known as 'Watermelon' has aroma of melons.