Colchicum decaisnei of Jordanian origin has yielded the dextrorotatory (6s) homoaporphine alkaloids (+)-kreysigine (1), (+)-multifloramine (2), (+)-decaisnine (3) and (+)-szovitsamine (4). Unambiguous 'H and 13C NMR assignments of these alkaloids have been achieved using a combination of 1D- and 2D-NMR spectroscopic techniques. Emphasis was placed on the resolution of the chemical shifts and the coupling constants of the alicyclic protons of rings B and C in order to reinvestigate the molecular conformation of these alkaloids. Also, a mass fragmentation pattern for (+)-multifloramine (2) based on eims, heims, peak matching and linked scan measurements (LSM) was proposed.