Species of Greatest Conservation Need
1124 species
| Scientifc Name | Common Name | Taxonomic Group | Federal Status | State Status | Global Rank | State Rank | Endemic |
|---|---|---|---|---|---|---|---|
| Caesalpinia phyllanthoides | South Texas rushpea | Plants | Not Listed | Not Listed | G2? | S1 | No |
| Calliandra biflora | two-flower stick-pea | Plants | Not Listed | Not Listed | G3 | S3 | No |
| Callirhoe scabriuscula | Texas poppy-mallow | Plants | E 01/13/1981 |
E 04/29/1983 |
G2 | S2 | Yes |
| Calopogon oklahomensis | Oklahoma grass pink | Plants | Not Listed | Not Listed | G2 | S1S2 | No |
| Campanula reverchonii | basin bellflower | Plants | Not Listed | Not Listed | G2 | S2 | Yes |
| Cardamine macrocarpa var. texana | Texas largeseed bittercress | Plants | Not Listed | Not Listed | G3T2 | S2 | No |
| Cardiospermum dissectum | Chihuahua balloon-vine | Plants | Not Listed | Not Listed | G3 | S3 | No |
| Carex decomposita | cypress knee sedge | Plants | Not Listed | Not Listed | G3G4 | S1 | No |
| Carex edwardsiana | canyon sedge | Plants | Not Listed | Not Listed | G3G4 | S3S4 | Yes |
| Carex mckittrickensis | Guadalupe Mountains sedge | Plants | Not Listed | Not Listed | G1 | S1 | Yes |
| Carex shinnersii | Shinner's sedge | Plants | Not Listed | Not Listed | G3 | S2 | No |
| Chaetopappa hersheyi | mat leastdaisy | Plants | Not Listed | Not Listed | G2 | S2 | No |
| Chaetopappa imberbis | awnless leastdaisy | Plants | Not Listed | Not Listed | G3 | S3 | Yes |
| Chaetopappa parryi | Parry's leastdaisy | Plants | Not Listed | Not Listed | G3 | S1 | No |
| Chloris texensis | Texas windmill grass | Plants | Not Listed | Not Listed | G2 | S2 | Yes |
| Chrysothamnus spathulatus | Douglas rabbitbrush | Plants | Not Listed | Not Listed | G3 | S2 | No |
| Cirsium turneri | cliff thistle | Plants | Not Listed | Not Listed | G3 | S3 | No |
| Cirsium wrightii | Wright's marsh thistle | Plants | T 05/25/2023 |
Not Listed | G2 | S1 | No |
| Clematis carrizoensis | Carrizo Sands leather-flower | Plants | Not Listed | Not Listed | G2 | S2 | Yes |
| Clematis texensis | scarlet leather-flower | Plants | Not Listed | Not Listed | G3G4 | S3S4 | Yes |
| Cleomella longipes | stalked rhombopod | Plants | Not Listed | Not Listed | G3G4 | S3 | No |
| Colubrina stricta | Comal snakewood | Plants | Not Listed | Not Listed | G2 | S1 | No |
| Coreopsis intermedia | goldenwave tickseed | Plants | Not Listed | Not Listed | G3 | S3 | No |
| Coryphantha macromeris var. runyonii | Runyon's cory cactus | Plants | Not Listed | Not Listed | G5T2T3 | S2S3 | No |
| Coryphantha nickelsiae | Nickels' cory cactus | Plants | Not Listed | Not Listed | G2 | SH | No |