Species of Greatest Conservation Need
1124 species
| Scientifc Name | Common Name | Taxonomic Group | Federal Status | State Status | Global Rank | State Rank | Endemic |
|---|---|---|---|---|---|---|---|
| Styrax platanifolius ssp. stellatus | hairy sycamore-leaf snowbell | Plants | Not Listed | Not Listed | G3T3 | S3 | Yes |
| Styrax platanifolius ssp. texanus | Texas snowbells | Plants | E 10/12/1984 |
E 01/09/1987 |
G3T1 | S1 | Yes |
| Styrax platanifolius ssp. youngiae | Young's snowbell | Plants | Not Listed | Not Listed | G3T1 | S1 | No |
| Symphyotrichum puniceum var. scabricaule | rough-stem aster | Plants | Not Listed | Not Listed | G5T2 | S1S2 | No |
| Tauschia texana | Texas tauschia | Plants | Not Listed | Not Listed | G3 | S3 | Yes |
| Tetraneuris turneri | Billie's bitterweed | Plants | Not Listed | Not Listed | G3 | S3 | No |
| Thalictrum arkansanum | Arkansas meadow-rue | Plants | Not Listed | Not Listed | G2Q | S2 | No |
| Thalictrum texanum | Texas meadow-rue | Plants | Not Listed | Not Listed | G2Q | S2 | Yes |
| Thelesperma burridgeanum | Burridge greenthread | Plants | Not Listed | Not Listed | G3 | S3 | Yes |
| Thelocactus bicolor var. flavidispinus | straw-spine glory-of-Texas | Plants | Not Listed | Not Listed | G4T2 | S2 | Yes |
| Thelypodiopsis shinnersii | Shinner's rocket | Plants | Not Listed | Not Listed | G2G3 | S2 | No |
| Thelypodium texanum | Texas thelypody | Plants | Not Listed | Not Listed | G3 | S3 | Yes |
| Thurovia triflora | threeflower broomweed | Plants | Not Listed | Not Listed | G2G3 | S2S3 | Yes |
| Thymophylla tephroleuca | ashy dogweed | Plants | E 07/19/1984 |
E 01/09/1987 |
G2 | S2 | Yes |
| Tidestromia carnosa | fleshy tidestromia | Plants | Not Listed | Not Listed | G3 | S2 | No |
| Tillandsia baileyi | Bailey's ballmoss | Plants | Not Listed | Not Listed | G2G3 | S2 | No |
| Tradescantia buckleyi | Buckley's spiderwort | Plants | Not Listed | Not Listed | G3 | S3 | No |
| Tradescantia pedicellata | granite spiderwort | Plants | Not Listed | Not Listed | G2Q | S2 | Yes |
| Tragia nigricans | darkstem noseburn | Plants | Not Listed | Not Listed | G3 | S3 | Yes |
| Trichocoronis wrightii var. wrightii | Wright's trichocoronis | Plants | Not Listed | Not Listed | G4T3 | S2 | No |
| Tridens buckleyanus | Buckley tridens | Plants | Not Listed | Not Listed | G3G4 | S3S4 | Yes |
| Trillium texanum | Texas trillium | Plants | Not Listed | Not Listed | G3 | S3 | No |
| Triphora trianthophoros var. texensis | Texas three-birds orchid | Plants | Not Listed | Not Listed | G4?T1Q | S1 | Yes |
| Valeriana texana | Guadalupe valerian | Plants | Not Listed | Not Listed | G2 | S2 | No |
| Valerianella florifera | Texas cornsalad | Plants | Not Listed | Not Listed | G3 | S3 | Yes |