Species of Greatest Conservation Need
1124 species
| Scientifc Name | Common Name | Taxonomic Group | Federal Status | State Status | Global Rank | State Rank | Endemic |
|---|---|---|---|---|---|---|---|
| Quercus hinckleyi | Hinckley's oak | Plants | T 08/26/1988 |
T 12/30/1988 |
G2 | S2 | No |
| Quercus robusta | robust oak | Plants | Not Listed | Not Listed | G1Q | S1 | Yes |
| Quercus tardifolia | lateleaf oak | Plants | Not Listed | Not Listed | G1 | S1 | No |
| Rayjacksonia aurea | Houston daisy | Plants | Not Listed | T 03/30/2020 |
G1 | S1 | Yes |
| Rhinotropis maravillasensis | Maravillas milkwort | Plants | Not Listed | Not Listed | G2 | S1 | No |
| Rhinotropis rimulicola var. rimulicola | rock crevice milkwort | Plants | Not Listed | Not Listed | G3T3 | S2 | No |
| Rhododon angulatus | Tharp's rhododon | Plants | Not Listed | Not Listed | G1Q | S1 | Yes |
| Rhododon ciliatus | Texas sandmint | Plants | Not Listed | Not Listed | G3 | S3 | Yes |
| Rhynchospora indianolensis | Indianola beakrush | Plants | Not Listed | Not Listed | G3Q | S3 | Yes |
| Rhynchospora macra | large beakrush | Plants | Not Listed | Not Listed | G3G4 | S2 | No |
| Rorippa ramosa | Durango yellow-cress | Plants | Not Listed | Not Listed | G2 | S1 | No |
| Rosa stellata ssp. mirifica var. erlansoniae | Erlanson's desert rose | Plants | Not Listed | Not Listed | G4T1 | S1 | No |
| Rudbeckia scabrifolia | bog coneflower | Plants | Not Listed | Not Listed | G3G4 | S2 | No |
| Salvia pentstemonoides | big red sage | Plants | Not Listed | Not Listed | G1 | S1 | Yes |
| Salvia summa | great sage | Plants | Not Listed | Not Listed | G3 | S2 | No |
| Schizachyrium spadiceum | honey false bluestem | Plants | Not Listed | Not Listed | G3? | S1 | No |
| Schoenolirion wrightii | Texas sunnybell | Plants | Not Listed | Not Listed | G3 | S3 | No |
| Schoenoplectus deltarum | Delta bulrush | Plants | Not Listed | Not Listed | G3G4 | S1 | No |
| Schoenoplectus hallii | Hall's baby bulrush | Plants | Not Listed | Not Listed | G3 | S1S2 | No |
| Sclerocactus brevihamatus ssp. tobuschii | Tobusch fishhook cactus | Plants | T 06/14/2018 |
E 04/29/1983 |
G4T3 | S3 | Yes |
| Sclerocactus mariposensis | Lloyd's mariposa cactus | Plants | T 11/06/1979 |
T 04/29/1983 |
G3 | S3 | No |
| Scutellaria laevis | smooth-stem skullcap | Plants | Not Listed | Not Listed | G1 | S1 | Yes |
| Sedum havardii | Havard's stonecrop | Plants | Not Listed | Not Listed | G2 | S2 | No |
| Selaginella viridissima | green spikemoss | Plants | Not Listed | Not Listed | G2 | S1 | No |
| Selenia grandis | large selenia | Plants | Not Listed | Not Listed | G3 | S3 | Yes |