is-true

Updated: August 6, 2026

Among all the previously described cases of horticultural plants and monstrosities there is no clearer case of an ever-sporting variety than this one of the water-persicaria. The var. terrestris sports into the var. natans, and as often as the changing life conditions may require it. It is-true that ordinary sports occur without our discerning the cause and without any relation to adaptation.

Hugo de Vries - Species and Varieties, Their Origin by Mutation