This name is a synonym.
Amaryllis haywardii Traub & Uphof, Herbertia 5: 124 (1938).
Amaryllis belladonna var. haywardii (Traub & Uphof) Traub & Moldenke, Amaryllis Manual: 123 (1949).
Hippeastrum puniceum var. haywardii (Traub & Uphof) H.E.Moore, Baileya 11: 16 (1963).
Amaryllis belladonna subsp. haywardii (Traub & Uphof) Ravenna, Pl. Life 37: 65 (1981).
Hippeastrum haywardii (Traub & Uphof) R.Lara & R.Vásquez, Fontqueria 56: 417 (2015).