<jats:title>Abstract</jats:title><jats:p>From the bark of <jats:italic>Lunasia arnara</jats:italic> B<jats:sc>LANCO</jats:sc> <jats:italic>var. refmnda</jats:italic> (L<jats:sc>AUTERB</jats:sc>. et K. S<jats:sc>CHUMM</jats:sc>) L<jats:sc>AUTERB</jats:sc>. (New Guinea) were isolated apart from the known Rutaceae alkaloids hydroxylunidine (I), hydroxylunacridine (II), lunacrine (111) and lunacridine (IV) two new crystalline alkaloids. One of these differs from I only by the absence of the tertiary hydroxyl group in the side‐chain and was therefore named lunidine (V). The other one (VIII) is a ketone also obtained by oxidation of the hydroxyl group of lunidine. We therefore named it lunidonine.