[From Clematis For Everyone, p. 11:] The species flammula... is perhaps the hardiest of the strong-scented clematis species that can be grown and flowered in northern British and European gardens... The hardiest of all the strong-scented species [known to the author] must be the "Sweet Autumn Scented Clematis"...

[From The Gardener's Guide to Growing Clematis, p. 7:] The scent produced by some species, such as C. recta from Central Europe and C. flammula from Southern Europe, is outstanding. Sadly, this strength of scent has not been bred into the large-flowered cultivars as yet...