Andersonine (1) and 14-deacetylnudicauline (2), two new C19-diterpenoid alkaloids, have been isolated from Delphinium andersonii Gray. Structures were deduced by spectroscopic methods. The structures of andersonine and 14-deacetylnudicauline were confirmed by correlation with nudicauline (5). Six known alkaloids were also isolated: delavaine (3), delectinine (8) lycoctonine (7), methyllycaconitine (6), nudicauline (5), and takaosamine (4).