whitlowgrasses

Updated: May 10, 2025

The main fact is, that such a small species as Draba verna is not at all a uniform type, but comprises over two hundred well distinguished and constant forms. It is readily granted that violets and whitlowgrasses are extreme instances of systematic variability. Such great numbers of elementary species are not often included in single species of the system.

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