Six new alkaloids, (+)-ovigeridimerine, 4-methoxyoxohernandaline, 7- formyldehydrohernangerine, 5,6-dimethoxy-N-methylphthalimide, 7-hydroxy-6- methoxy-1-methylisoquinoline and (+)-vateamine-2'-β-N-oxide, along with one new dialdehyde, hernandial, have been isolated and characterized from the trunk bark of Hernandia nymphaeifolia. The structures of these compounds were elucidated by spectral analyses.