| Trifolium dubium Sibth., 1794 |
| Trifolium exile Greene, 1887 |
| Trifolium fendleri Greene, 1897 |
| Trifolium fimbriatum Lindl., 1827 |
| Trifolium fistulosum Vaughan, 1939 |
| Trifolium geminiflorum Greene, 1897 |
| Trifolium goniocarpum Lojac., 1883 |
| Trifolium gracilentum Torr. & A. Gray, 1838 |
| Trifolium gracilentum var. gracilentum Torr. & A. Gray, 1838 |
| Trifolium gracilentum var. palmeri (S. Watson) McDermott, 1910 |
| Trifolium guianense Aubl., 1775 |
| Trifolium helleri P.B. Kenn., 1913 |
| Trifolium hemsleyi Lojac., 1883 |
| Trifolium heterodon Torr. & A. Gray, 1838 |
| Trifolium hickeyi T.K. Ahlq. Vincent, 2020 |
| Trifolium inconspicuum (Fernald) A. Heller, 1906 |
| Trifolium insularum P.B. Kenn., 1913 |
| Trifolium involucratum Ortega, 1797 |
| Trifolium lacerum Greene, 1894 |
| Trifolium longicaule Wooton & Standl., 1913 |