A study of the minor bases of D. nuttallianum resulted in the isolation and identification of eight known and five new diterpenoid alkaloids. In the course of an investigation of the toxic properties of D. nuttallianum Pritz., a cow-poisoning plant of the rangeland of Interior British Columbia, we identified sixteen known and four new norditerpenoid alkaloids (first designated A-D), as well as one new diterpenoid base. We now report the outcome of further fractionation of the minor bases of this plant, by VLC on basic alumina followed by repeated PTLC on silica gel, which resulted in the separation of another thirteen components. Individually these were obtained as amorphous solids in very small amounts (< 5 mg, 0.56% of the total plant alkaloids) but the application of modern spectrometric procedures, including in some cases proton-detected (inverse) heteronuclear proton-carbon NMR chemical shift correlations according to Bax and Subramanian, allowed us to deduce their structures. Eight were thus identified as alkaloids which had been described before: N-acetyldelectine, bicolorine, 2-dehydrohetisine, delectinine, hetisine, hetisine-11,13-di-O-acetate, lycoctonine and takosamine. The other five alkaloids (E - I) appear to be new. The evidence which led us to their structures may be summarised as follows.