Here's a site that lists:
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)
colour
flowering season (e.g. early, midseason, or late, with respect to peony blooming time)
height
if it is floriferous (i.e. has side buds)
if it is fragrant
http://www.theplantexpert.com/...
