Charles Darwin,
The Variation of Animals and Plants under Domestication…
“ Analogous cases of reversion occur in the vegetable kingdom; thus "from seeds gathered from the finest cultivated varieties of Heartsease (Viola tricolor) , plants perfectly wild both in their foliage and their flowers are frequently produced;" (13/7. Loudon's 'Gardener's Mag.' volume 10 1834 page 396: a nurseryman, with much experience on this subject, has likewise assured me that this sometimes occurs.) but the reversion in this instance is not to a very ancient period, for the best existing varieties of the heartsease are of comparatively modern origin. ”
