Correll, ?U.S. Dept. Agric. Monogr. no. 11: 228, fig. 164-166. 1952.?, 1952.

Correll, ?U.S. Dept. Agric., Agric. Mon. (Sect. Tuber. Gen. Solan. N. Am.& Cent. Am.) 11: 161, fig.?, 1952.

Correll and Correll, ?Agric. Monogr. U.S.D.A. 11: 158. 1952.?, 1952.

Correll, ?U.S. Dept. Agric., Agric. Mon. 11: 65, 43, 44. 1952.?, 1952.

Correll, ?U.S. Dept. Agric., Agric. Mon. 11: 157, fig. 105, 106. 1952.?, 1952.

Correll, ?U. S. Dept. Agric., Agric. Monog. no. 11: 63, figs. 41, 42. 1952.?, 1952.

Correll, ?U.S. Dept. Agric., Agric. Mon. 11: 25, fig. 11, 12. 1952.?, 1952.

Correll, ?U.S. Dept. Agric., Agric. Mon. 11: 79, fig. 53, 54. 1952.?, 1952.

Correll, ?U. S. Dept. Agric., Agric. Mon. 11: 83, fig. 55. 1952.?, 1952.