| Fabaceae | |
Trifolium monanthum var. caulescens
| Lojac. | Nuovo Giorn. Bot. Ital. 15(2): 180–181 | 1883 |
| Fabaceae | ! |
Trifolium monanthum var. eastwoodianum
| J.S. Martin | Madroño 8(7): 233 | 1946 |
| Fabaceae | |
Trifolium monanthum fo. glabrifolium
| McDermott | Ill. Key Amer. Trifolium 108, 110 | 1910 |
| Fabaceae | |
Trifolium monanthum fo. grantianum
| (A. Heller) McDermott | Ill. Key Amer. Trifolium 101 | 1910 |
| Fabaceae | |
Trifolium monanthum subsp. grantianum
| (A. Heller) J.M. Gillett | Canad. J. Bot. 58(13): 1434 | 1980 |
| Fabaceae | ! |
Trifolium monanthum var. grantianum
| (A. Heller) Parish | Pl. World 20(7): 220 | 1917 |
| Fabaceae | |
Trifolium monanthum subsp. monanthum
| | | |
| Fabaceae | ! |
Trifolium monanthum var. monanthum
| | | |
| Fabaceae | |
Trifolium monanthum subsp. parvum
| (Kellogg) J.M. Gillett | Canad. J. Bot. 58(13): 1435 | 1980 |
| Fabaceae | ! |
Trifolium monanthum var. parvum
| (Kellogg) McDermott | Ill. Key Amer. Trifolium 105 | 1910 |
| Fabaceae | |
Trifolium monanthum var. pusillum
| (Greene) Jeps. | Fl. Calif. 2(3): 297 | 1936 |
| Fabaceae | |
Trifolium monanthum fo. spatiosum
| McDermott | Ill. Key Amer. Trifolium 98–100, pl. 35h1 | 1910 |
| Fabaceae | |
Trifolium monanthum subsp. tenerum
| (Eastw.) J.M. Gillett | Canad. J. Bot. 58(13): 1436 | 1980 |
| Fabaceae | |
Trifolium monanthum var. tenerum
| (Eastw.) Parish | Bot. Gaz. 38(6): 461 | 1904 |
| Fabaceae | * |
Trifolium monanthum var. typicum
| J.S. Martin | Madroño 8(7): 230 | 1946 |