From an ethanolic extract of Peschiera fuchsiaefolia three quaternary alkaloids have been isolated and their structures determined from their spectral data as 12-methoxy-4-methylvoachalotine, 12-methoxy-4-methylvoachalotine ethyl ester and fuchsiaefoline. Analyses of the 13C NMR spectra of some sarpagine alkaloids were carried out to confirm the structures of these compounds. © 1987.