“…There have been numerous studies examining phylogenetic relationships among groups within subgenus Potatoe. These investigations have employed data from morphology (Dunal, 1852;Bitter, 1912a;Borner, 1912;Correll, 1958Correll, , 1962D'Arcy, 1972D'Arcy, , 1979D'Arcy, , 1982D'Arcy, , 1987D'Arcy, , 1991Anderson, 1979b;Hunziker, 1979;Seithe and Anderson, 1982;Taylor, 1986;Rick, 1988;Child, 1990;Hawkes, 1990;Child and Lester, 1991;, breeding systems or crossability, including somatic hybridizations (Wann and Johnson, 1963;Anderson, 1977;Melchers, Sacristan, and Holder, 1978;Hermsen and Taylor, 1979;Rick, 1979;Whalen and Anderson, 1981;Handley et al, 1986;Austin et al, 1988;Fish, Karp, and Jones, 1988;Devema et al, 1990;Anderson and Bernardello, 1991;Matsubayashi, 1991;Mione and Anderson, 1992), amino acid sequences of plastocyanin or the small subunit of ribulose-1,5-biphosphate carboxylase (Boulter et al, 1979;Martin et al, 1986), flavonoids (Steinharter, Cooper-Driver, and Anderson, 1986), genetic linkage studies (Bonierbale, Plaisted, and Tanksley, 1988), mitochondrial DNA (McClean and Hanson, 1986), chromosome morphology and evolution (Bemardello and Anderson, 1990), chloroplast DNA (Palmer and Zamir, 1982;<...>…”