Maslin (1987) discusses the confused nomenclature and allied species of <I>A. acinacea</I>. Description of the new species <I>A. halliana</I> is given (q.v.) and the relationship of <I>A. acinacea</I> to <I>A. imbricata, A. microcarpa</I> and <I>A. triquetra</I> with commentary and maps provided.