| Latin family name | Latin name of subordinates |
| Talinaceae | Talinum; |
| Tamaricaceae | Tamarix; |
| Taxaceae | Taxus; |
| Taxodiaceae | Taiwania; Taxodium; |
| Tectariaceae | Pleocnemia; Pteridrys; Tectaria; |
| Tetramelaceae | Tetrameles; |
| Theaceae | Camellia; Gordonia; Polyspora; Pyrenaria; Schima; Stewartia; Tutcheria; |
| Thelypteridaceae |
Ampelopteris;
Amphineuron;
Dictyocline;
Glaphyropteridopsis;
Macrothelypteris;
Metathelypteris;
Parathelypteris;
Pneumatopteris;
Pronephrium;
Pseudocyclosorus;
Pseudophegopteris;
Trigonospora; |
| Thuidiaceae | Haplocladium; Pelekium; Thuidium; |
| Thymelaeaceae | Aquilaria; Daphne; Edgeworthia; Enkleia; Linostoma; Thymelaea; Wikstroemia; |
| Torricelliaceae | Aralidium; Torricellia; |
| Trachypodaceae | Bryowijkia; Trachypodopsis; |
| Trochodendraceae | Tetracentron; |
| Tropaeolaceae | Tropaeolum; |
| Typhaceae | Sparganium; Typha; |