Native Plants
Botanical Glossary
Glossary of commonly used botanical terms and their definitions.
| term | definition | image |
| Tripinnate | A bipinnate leaf whose pinnae are divided into a third set of leaflets. | |
| Truncate | Ending abruptly, e.g., a leaf blade squared at the base. | |
| Tubercle | A more or less pyramidal knob rising from the stem surface of a cactus and having an areole on or near its summit. | |
| Twig | A small branch. | |
| Two lipped flower | A flower that has an upper and a lower division, as in Labiatae (Mint Family). | |
| Umbel | A rounded or flat topped cluster of flowers on stems that radiate from the tip of the main stem. A compound umbel has smaller umbels at the ends of the radiating stems. | |
| Unisexual | A flower that possesses either stamens or carpels but not both. | |
| UPL | Upland - Nonhydrophyte. Almost never occurs in wetlands. | |
| UPL* | Upland - Nonhydrophyte. Almost never occurs in wetlands. Occurs only in the South Pacific Islands subregion. | |
| Vein | A rib of tissue, usually in a leaf. | |
| term | definition | image |