<jats:p> The most abundant readily isolated alkaloids of the aerial portion of Aconitumcolumbianum Nutt<jats:sub>•</jats:sub> were found to be talatisamine and cammaconine. New spectral data for known derivatives of these alkaloids and descriptions of new derivatives are presented. Less abundant alkaloids identified included the known ones sachaconitine, talatizidine, isotalatizidine, and 14-O-acetyltalatisamine, and the new ones 8-O-methyltalatisamine and a tetrahydroxymonomethoxy alkaloid, columbianine, with the same oxygenation pattern and stereochemistry as cammaconine.