Echinopsis tephracantha Backeb. & F.M.Knuth, Kaktus-ABC: 219. 1936 ["1935"] Echinopsis tephracantha Backeb. & F.M.Knuth, Kaktus-ABC: 219. 1936 ["1935"]Taxon for this nameEchinopsis tephracantha Backeb. & F.M.Knuth, Kaktus-ABC: 219. 1936 ["1935"]