These subspecies are differentiated by changes in leaf shape and size. Rather the taxa segregated on a morphological criterion, namely leaf shape. Leaf shape is diverse across the genus. The leaf shape is broad to elliptical. The English common name refers to the similarity in leaf shape to almond leaves. The various species differ in their leaf shape and arrangement. A number of infraspecific taxa are recognised, varying in their leaf shape. The two species can be differentiated by leaf shape and leaf margin. The leaf shape is cylindrical or sometimes flattened. The specific epithet "tricuspidata" means three-pointed, referring to the leaf shape. The leaf shape is ovate, the tip is acute and margin is serrated. The Roman Parazonium blade tended to be leaf shape and approximately 15"-19" long. Leaf shape can be determined by both genetics and the environment . The edges are undulated and the leaf shape can range from oval to almost circular. Leaf shape can range from oblong, broadly obovate to ovate.