1. Heudebolin (100 mg) dissolved in 30 ml MeOH and 25 ml 1M NaOH was refluxed for 7 hr, cooled, diluted with H₂O and extracted with Et₂O. Evaporation afforded an oil (55 mg) which could not be crystallized but was homogenous (TLC) and identical with the complete hydrolysis product of an authentic sample of nimbolin-B provided by Dr. C. O. Fakunle. 2. From the MeOH extract of the tubers (air-dried, 820 g) of Corydalis ambigua, tertiary nonphenolic base fraction (Fr. A, 0.32% yield), tertiary phenolic base fraction (Fr. B, 0.07%) and quaternary base fraction (Fr. C, 0.16%) were obtained. The following tertiary alkaloids, including one new alkaloid, were isolated from Fr. A and B: (+)-corybulbine (0.035%, m.m.p.), (+)-corydaline (0.019%, m.m.p.), (+)-base II (0.011%, m.p., IR, NMR), cavidine ((±)-base II, 0.001%, m.m.p.), (±)-tetrahydropalmatine (0.001%, m.m.p.), protopine (0.003%, m.m.p.), α-allocryptopine (0.001%, m.m.p.) and (+)-1-methylcorypalline (0.001%, new alkaloid, m.p. 156-158°, [α]ᴅ 33.5° (c 0.23, CHCl₃), 1.0° (c 0.23, EtOH)). Although (+)-1-methylcorypalline was obtained as a synthetic product, this is the first record of the occurrence of (+)-form as a natural product. Its structure was deduced from spectral data and confirmed by synthesis. Fr. C was purified to give dehydrocoryduline (as chloride, 0.024%, IR, NMR, reduction with NaBH₄ to give (±)-corydaline, m.m.p.) and dehydrothalictrifole (as chloride, 0.007%, NMR, reduction to give dl-thalictrifoline, m.m.p.). (+)-1-methylcorypalline, cavidine, α-allocryptopine and dehydrothalictrifoline were isolated for the first time from this plant. 3. 500 g of powdered leaves and twigs of Kageneckia oblonga were extracted (Soxhlet) with CHCl₃-AcOEt (1:1). Partial solvent removal under vacuum afforded a precipitate (4.5 g). 0.9 g of crude product was methylated with CH₂N₂ in Et₂O, yielding 0.92 g of solid residue. Preparative TLC gave five fractions: A (400 mg), B (190 mg), C (11 mg), D (33 mg), E (5 mg). Compound A was identified as ursolic acid methyl ester by m.p., [α]ᴅ, IR, MS; its acetate was identified by m.p., m.m.p., [α]ᴅ, IR, MS and co-TLC. Compound B was identified as benthamic acid methyl ester by m.p., m.m.p., [α]ᴅ, IR, MS and co-TLC; its monoacetate was identified by m.p., [α]ᴅ, IR, NMR and MS.