Much of the ethnopharmacological material cited in this paper was gathered during more than 40 years of field work by one of the authors (R. E.S.) or by his students. Most of the alkaloid tests reported were carried out in the field by the junior author (R.F.R.). we have included pertinent data from this geographical area that has recently appeared in local publications of limited distribution as well as annotations found on herbarium speclmens,.