Phytochemical studies on Narcissus obesus resulted in the isolation of seven Amaryllidaceae alkaloids. Six of them, bicolorine, 5,6-dihydrobicolorine, epimacronine, galanthamine, pretazettine, and haemanthamine, are common in this genus, whereas obesine [1] is reported here for the first time. The stereochemistry and structural determination of this new alkaloid have been carried out by spectroscopic analyses and by application of 2D nmr techniques.