In a preceding paper, the alkaloids of Colehourn szovitsii Fisch. collected in the fruit-bearing period were reported. On investigating the plant in the flowering period, 0.17% of total alkaloids were isolated, consisting of 0.14% weak bases and 0.03% strong bases. In the weak bases, colchicine, 2-demethylcolchicine, 3-demethyl-β-lumicolchicine, and unidentified compounds were detected by chromatographic methods. The mixture of strong bases contained unidentified substances. By preparative thin-layer chromatography of the nonphenolic strong bases, individual compounds with Rf 0.46 and 0.86 were obtained. The base with Rf 0.86 has the composition C₁₉H₂₉O₅N, is a viscous oily substance with [α]ᴰ²¹ +81° (c 0.43; chloroform), methiodide with mp 150-153° (from ether-acetone). Its UV spectrum has absorption maxima at 258 and 290 nm (log ε 4.00, 3.78), PMR spectrum shows signals of two aromatic protons, five methoxy groups, and a N-methyl group, and mass spectrum has characteristic peaks at m/e 399 (M⁺), 384 (M⁺-15), and 368 (M⁺-31). These facts indicate it corresponds to 2,3,4,5,6-pentamethoxyhomoaporphine, i.e., O-methylkreysigine with absolute configuration R. Previously, (-)-O-methylkreysigine was obtained by methylation with diazomethane, and this is the first time it has been obtained from plant material.