| Gentianaceae Juss., 1789 |
| Gentianeae Dumort., 1829 |
| Gentianella Moench, 1794 |
| Gentianella amarella (L.) Börner, 1912 |
| Gentianella amarella subsp. acuta (Michx.) J.M. Gillett, 1957 |
| Gentianella amarella subsp. hartwegii (Benth.) J.M. Gillett, 1957 |
| Gentianella amarella subsp. mexicana (Griseb.) J.M. Gillett, 1957 |
| Gentianella canosoi G.L. Nesom & B.L. Turner, 1990 |
| Gentianella heterosepala (Engelm.) Holub, 1967 |
| Gentianella mexicana (Griseb.) Holub, 1967 |
| Gentianella microcalyx (Lemmon) J.M. Gillett, 1957 |
| Gentianella wislizeni (Engelm.) J.M. Gillett, 1957 |
| Gentianopsis Ma, 1951 |
| Gentianopsis detonsa (Rottb.) Ma, 1951 |
| Gentianopsis detonsa var. lanceolata (Benth.) Villarreal & A.E. Estrada, 2011 |
| Gentianopsis detonsa var. superba (Greene) Villarreal & A.E. Estrada, 2011 |
| Gentianopsis lanceolata (Benth.) Iltis, 1965 |
| Gentianopsis macrantha (D. Don ex G. Don) Iltis, 1965 |
| Gyrandra Griseb., 1845 |
| Gyrandra brachycalyx (Standl. & L.O. Williams) G. Mans., 2004 |