Glycine soja, known as wild soybean, is an annual plant in the family Fabaceae. It may be treated as a separate species, the closest living relative of the cultivated soybean, Glycine max, an important crop, or as a subspecies of the cultivated soybean, Glycine max subsp. soja. The plant is native to eastern China, Japan, Korea and far-eastern Russia. Much work into Aphis glycines resistance in this genus has been done by Hill et al. – including Hill et al. 2004 a, Hill et al. 2004 b, Hill et al. 2006 and Hill et al. 2010. Hill et al., 2004 b find that this species has resistance genetics not found in G. max (cultivated varieties). This may make G. soja useful as a wild relative for introgression of aphid resistance.