Trifolium microcephalum Pursh, Fl. Amer. Sept. 2: 478. 1814 ["1813"] sec. Téllez-Valdés 2009
- ≡Lojaconoa microcephala (Pursh) Bobrov in Bot. Žhurn. (Moscow & Leningrad) 52: 1598. 1967 syn. sec. Téllez-Valdés 2009
- =Trifolium microcephalum var. lemmonii Lojac. in Nuovo Giorn. Bot. Ital. 15: 193. 1883 syn. sec. Téllez-Valdés 2009
- =Trifolium microcephalum f. velutinum McDermott, Ill. Key Amer. Trifolium: 120, pl. 44. 1910 syn. sec. Téllez-Valdés 2009