Calochortus ambiguus (M.E. Jones) Ownbey, Ann. Missouri Bot. Gard. 27: 505-508. t. 40, f. 1-2, mapa 8. 1940 sec. Espejo-Serna & López-Ferrari 2008
- ≡Calochortus watsonii var. ambiguus M.E. Jones in Contr. W. Bot. 14: 27. 1912 syn. sec. Espejo-Serna & López-Ferrari 2008