| Tragacantha orthantha (A. Gray) Kuntze, 1891 |
| Tragacantha oxyrhyncha (Hemsl.) Kuntze, 1891 |
| Tragacantha palmeri (A. Gray) Kuntze, 1891 |
| Tragacantha parva (Hemsl.) Kuntze, 1891 |
| Tragacantha racemosa (Pursh) Kuntze, 1891 |
| Tragacantha reptans (Humb. & Bonpl.) Kuntze, 1891 |
| Tragacantha sonorae (A. Gray) Kuntze, 1891 |
| Tragacantha strigulosa (Kunth) Kuntze, 1891 |
| Tragacantha tephrodes (A. Gray) Kuntze, 1891 |
| Tragacantha vaccarum (A. Gray) Kuntze, 1891 |
| Tragacantha vestita (Benth.) Kuntze, 1891 |
| Trichopodium C. Presl, 1845 |
| Trichopodium diffusum (Moric.) C. Presl, 1844 |
| Trichopodium glandulosum C. Presl, 1844 |
| Trifolieae Endl., 1830 |
| Trifolium L., 1753 |
| Trifolium adscendens Hornem., 1815 |
| Trifolium albopurpureum Torr. & A. Gray, 1838 |
| Trifolium albopurpureum f. argillorum (Jeps.) Jeps. ex McDermott, 1910 |
| Trifolium albopurpureum var. neolagopus (Lojac.) McDermott, 1910 |