Since the publication of Newell and Hymowitz (1983), we have obtained a considerable number of new intra-and interspecific hybrids in subgenus Glycine. Parents in the hybridization programs were selected based upon their differences in morphology, chromosome number, and the area of origin. These hybrids shown below are being studied cytogenetically.
Singh, R. J. and Hymowitz, T.
"Research Notes : United States : Hybridization in genus Glycine subgenus Glycine,"
Soybean Genetics Newsletter: Vol. 11
, Article 32.
Available at: http://lib.dr.iastate.edu/soybeangenetics/vol11/iss1/32