1. Bamberg, J.B., M.W. Martin, J. Schartner, and D.M. Spooner. 1996. Inventory of tuber-bearingSolanum species. Potato Introduction Station, NRSP-6, Sturgeon Bay, WI.
2. Bamberg, J.B. and D.M. Spooner. 1994. The United States potato introduction station herbarium. Taxon 43:489–496.
3. Bukasov, S.M. 1930. The cultivated plants of Mexico, Guatemala and Colombia (in Russian, English summary). Trudy Prikl Bot Suppl 47:191–226, 513–525.
4. Child, A. 1990. A synopsis ofSolanum subgenusPotatoe (G. Don) (D’Arcy) (Tuberarium (Dun.) Bitter (s.l.)). Feddes Repert 101:209–235.
5. Correll, D.S. 1948a Collecting wild potatoes in Mexico. USDA Circ 797:1–40.