Matucana blancii var. nigriarmata Backeb. in Natl. Cact. Succ. J. 11: 71. 1956 Matucana blancii var. nigriarmata Backeb. in Natl. Cact. Succ. J. 11: 71. 1956Taxon for this nameMatucana blancii var. nigriarmata Backeb.