Opuntia erinacea Engelm. & J.M. Bigelow [ Opuntia hystricina Engelm. & J.M. Bigelow]
Torrey, J., Reports of explorations and surveys, to ascertain the most practicable and economical route for a railroad from the Mississippi River to the Pacific Ocean in 1853-6 (1856)
Pacif. Railr. Rep.

vol. 4 (1853-1856)
t. 15