Romanschulzia mexicana Iltis & Al-Shehbaz Romanschulzia mexicana Iltis & Al-Shehbaz in Novon 3(2): 96-98, f. 1. 1993 sec. Al-Shehbaz 2013=Lexarzanthe mexicana (Iltis & Al-Shehbaz) Diego & Calderón in Acta Bot. Mex. 68: 76–79, f. 1. 2004 syn. sec. Al-Shehbaz 2013