2. A culture of ra₂ received from Dr. Brink at Wisconsin proves to be similar to the one I have studied for many years. There is some variability in type of ear, some cultures showing rudimentary male flowers on the tips of some ears, irregularity of rows on the cob but no division of the cob as in ra₁. Other cultures have a divided cob on the tip of the ear but a solid cob at the base. Ra₁ can be separated from ra₂ in the F₂ of a cross.

H. K. Hayes