Unknown. “Soja ussuriensis. Wild soy bean. View [of] the wild soy bean plants growing along road side on [the] outskirts of Heijo, [Chosen]. These plants appear different from wild soy bean found in Manchuria and Japan. The leaves are larger and somewhat different[ly] shape[d]. The plants, however, are very hairy and are now just about past full bloom. Photograph #45649..” Special Collections, USDA National Agricultural Library. Accessed December 6, 2022, https://www.nal.usda.gov/exhibits/speccoll/items/show/383.