parent-types

Updated: May 22, 2025

But to enlarge the range of the varieties this simple and stable form would need to be treated anew, by crossing it with the parent-types. Such experiments however, have miscarried owing to the too stable nature of the unit-characters. This stability and this absence of the splitting shown by varietal marks in the offspring of hybrids is one of the best proofs of unisexual unions.

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