(B. ) Hawkes, Hawkes,, Hawkes,, and Hawkes, ?Potato Collect. Exped. Mexico & S. Amer., 2, Syst. Classific. Collect. 55. 1944.?, 1944.

(B. ) Hawkes, ?Bull. Imp. Bur. Pl. Breed. Genet., Cambridge 35. 1944.?, 1944.