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The isolation of nine tertiary bases from Hunteria ebúrnea Pichón is described. Eburnamine (I), isoeburnamine (II), eburnamonine (III), and eburnamenine (IV) are the first members of a new class of pentacyclic indole alkaloids. A new variant of the yohimbinoid ring skeleton is found in burnamicine (VI). Of the remaining alkaloids the indolines pleiocarpine (V) and pleiocarpamine are known compounds, while burnamine, an indoline with an echitamine type ultraviolet absorption spectrum, and neburnamine, an indole, are new compounds.