Erythrostemon placidus (Brandegee) Gagnon & G.P. Lewis, PhytoKeys 71: 126. 2016 sec. Gagnon & al. 2016
- ≡Caesalpinia placida Brandegee, Proc. Calif. Acad. Sci. ser. 2, 3: 131. 1891 syn. sec. Gagnon & G.P. Lewis 2016
- ≡Poinciana placida (Brandegee) Rose, Contr. U.S. Natl. Herb. 13: 303. 1911 syn. sec. Gagnon & G.P. Lewis 2016
- ≡Poincianella placida (Brandegee) Britton & Rose, N. Amer. Fl. 23(5): 331. 1930 syn. sec. Gagnon & G.P. Lewis 2016