Great idea Liz!
Here's another site that lists which peonies have fragrance, and I also like that they list who originated the plant and when, along with nice pictures. The site provides some nice info:
biological description (e.g. whether it is a hybrid or a Paeonia lactifolia cultivar)
who originated the cultivar and when (e.g. Roger F. Anderson, 1986)
flower form (e.g. single, double, semi-double, and so forth)
flowering season (e.g. early, midseason, or late, with respect to peony blooming time)
if it is floriferous (i.e. has side buds)
if it is fragrant
I reviewed the list from Swenson's, ( thanks LG for posting the link), and I have 27 plants from the list, with 14 of them being fragrant :hurray:.