Ten alkaloids, 15α-hydroxy-14,15-dihydrovindolinine, 15α-hydroxy-14,15-dihydro-16-epi-vindolinine, vindolinine, epivindolinine, vindolinine N(b)-oxide, epivindolinine N(b)-oxide, kopsinine, 15-hydroxykopsinine, vincadifformine and quebrachamine were isolated from Melodinus morsei. The first two are new compounds, with their structures elucidated by spectroscopic methods. © 1994.