I think of violet leaf as a heart note . . . lasts a good 45 minutes plus. Love that stuff.
I love wormwood/artemisia (which can also last tens of minutes) . . . Yatagan is the greatest example I know of.
Bergamot is gorgeous in Eau de Guerlain and many, many, many other great frags
I really love lemon too. People think of it as a simple sour smell but great quality lemon peel oil has a very sophisticated depth with green and herbal facets. Jicky has an amazing lemon accord.
So many more . . . I love herbs, leaves, and citrus. Lime leaf . . . Rosemary . . . these are all smells that I do not associate with frags actually, since I owned many "top note" essential oils before ever buying a bottle of commercial juice.