"Mascagnia" in the traditional sense of was a highly polyphyletic assemblage, a "form-genus" based on the lateral-winged samaras.Since the mid-1980s, morphological and molecular studies led to the removal of discordant elements, which were assigned to the genera "Adelphia", "Aenigmatanthera", "Alicia", "Amorimia", "Calcicola", "Callaeum", "Carolus", "Christianella", "Malpighiodes", "Niedenzuella", and "Psychopterys".