heeger

Updated: May 11, 2025

Professor Heeger discovered one plant with deviating fruits, in a group of common shepherd's purses in the market-place near Landau in Germany, in the fall of 1897. They were nearly spherical, instead of flat and purse-shaped. Their valves were thick and fleshy, while those of the ordinary form are membranaceous and dry.

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