Soybeans are grown throughout much of the United States. In the United States, the wild and weedy forms of soybean are only known at university and other specialized research stations. Sexually Compatible Relatives in the United States Soybean only crosses readily with other members of the species, and with other members in Glycine subgenus Soia. Soybean crosses with members of Glycine subgenus Glycine only imperfectly and under extreme technical assistance. Aside from the soybean, there are no members of the genus Glycine that grow in the United States outside of specialized research collections under scientific care and scrutiny.
Soybean is the only plant that grows in the United States and is sexually compatible with soybean.
Modes of Gene Escape from Research Plots Pollen is unlikely to escape from research plots. However, some remaining seed from one crop is capable of germinating the following season, and is therefore able to cause a temporal, if not geographic, dispersal of the soybean plant. Vegetative reproduction of soybean plants does not occur under field conditions. J. R. Wilcox. American Society of Agronomy.