In an increase plot of foundation seeds of Harosoy in 1957 at Urbana, a number of Harosoy-type plants were found with flowers of a deeper red than the normal purple (P). The color is best described as magenta (M). This mutant was added to the Genetic Type Collection as T235.
Buzzel, R. I.; Bernard, R. L.; and Buttery, B. R.
"Research Notes: Agriculture Canada and United States Department of Agriculture,"
Soybean Genetics Newsletter: Vol. 1
, Article 5.
Available at: http://lib.dr.iastate.edu/soybeangenetics/vol1/iss1/5