tetrastichum

Updated: May 4, 2025

They have the same varietal mark, but belong to different species of barley. These are differentiated according to the number of the rows in which the grains are seen on the spikes. These numbers may be two, four or six, giving rise to the specific names of Hordeum distichum, tetrastichum and hexastichum.

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