Astragalus wootonii E. Sheld. in Minnesota Bot. Stud. 1(3): 138. 1894 sec. Téllez-Valdés 2009
- =Astragalus playanus M.E. Jones in Contr. W. Bot. 8: 6–7. 1898 syn. sec. The Plant List 2013
- =Phaca wootonii (E. Sheld.) Rydb., N. Amer. Fl. 24(6): 350. 1929 syn. sec. Téllez-Valdés 2009
- =Astragalus tracyi (Rydb.) Cory in Rhodora 38(455): 406. 1936 syn. sec. The Plant List 2013