Grusonia dumetorum (A. Berger) E.F. Anderson Grusonia dumetorum (A. Berger) E.F. Anderson in Cact. Succ. J. (Los Angeles) 71(6): 325. 1999 sec. Guzmán & al. 2003=Corynopuntia dumetorum (A. Berger) F.M. Knuth, Kaktus-ABC: 116. 1935 syn. sec. ???