Noccaea mexicana (Standl.) Holub Noccaea mexicana (Standl.) Holub in Preslia 70(2): 108. 1998 sec. Warwick & Al-Shehbaz 2006=Thlaspi mexicanum Standl. in Publ. Field Mus. Nat. Hist., Bot. Ser. 22(2): 76. 1940 syn. sec. Warwick & al. 2006