As part of a genetic study of the relationships within the genus Glycine subgenus Soja we wish to report some observations on the inheritance of traits in crosses of G.max x G.soja and G.max x semi-wild ("gracilis") lines. The data to be discussed are contained in Table 1; the discussion will proceed on a locus by locus basis. Fr locus: Segregation of non-fluorescing root phenotypes was observed in two crosses: 'Hark' (Fr) x PI 153,292 (a non-fluorescent semi-wild line) and 'Minsoy' (fr) x PI 342,6228 (a fluorescent G.soja).