Tephrosia potosina Brandegee Tephrosia potosina Brandegee in Univ. Calif. Publ. Bot. 4: 272. 1912 sec. Téllez-Valdés 2009=Cracca potosina (Brandegee) Standl. in Contr. U.S. Natl. Herb. 23: 472. 1922 syn. sec. Téllez-Valdés 2009