Metastelma lanceolatum Schltr. Metastelma lanceolatum Schltr. in Bull. Herb. Boissier, sér. 2, 6: 840–841. 1906 sec. Juárez-Jaimes & al. 2007=Ditassa mexicana Brandegee in Univ. Calif. Publ. Bot. 10(8): 414–415. 1924 syn. sec. ???