Species of Greatest Conservation Need
427 species
| Scientifc Name | Common Name | Taxonomic Group | Federal Status | State Status | Global Rank | State Rank | Endemic |
|---|---|---|---|---|---|---|---|
| Opuntia aureispina | golden-spine prickly-pear | Plants | Not Listed | Not Listed | G1 | S1 | No |
| Opuntia imbricata var. argentea | silver cholla | Plants | Not Listed | Not Listed | G5T1 | S1 | Yes |
| Oreocarya crassipes | Terlingua Creek cat's-eye | Plants | E 09/30/1991 |
E 03/30/1993 |
G1 | S1 | Yes |
| Osmorhiza bipatriata | Livermore sweet-cicely | Plants | Not Listed | T 03/30/2020 |
G2? | S1 | No |
| Ostrya chisosensis | Big Bend hop-hornbeam | Plants | Not Listed | Not Listed | G2 | S1 | No |
| Packera texensis | Llano butterweed | Plants | Not Listed | Not Listed | G2 | S2 | Yes |
| Paronychia congesta | bushy whitlow-wort | Plants | PE 05/11/2005 |
Not Listed | G1 | S1 | Yes |
| Paronychia jonesii | Jones' nailwort | Plants | Not Listed | Not Listed | G3G4 | S3S4 | Yes |
| Paronychia maccartii | McCart's whitlow-wort | Plants | Not Listed | Not Listed | GH | SH | Yes |
| Paronychia setacea | bristle nailwort | Plants | Not Listed | Not Listed | G3 | S2 | Yes |
| Paronychia wilkinsonii | Wilkinson's whitlow-wort | Plants | Not Listed | Not Listed | G2G3 | S2 | No |
| Pediomelum cyphocalyx | turnip-root scurfpea | Plants | Not Listed | Not Listed | G2G3 | S2S3 | Yes |
| Pediomelum humile | Rydberg's scurfpea | Plants | Not Listed | Not Listed | G1 | S1 | No |
| Pediomelum pentaphyllum | Chihuahua scurfpea | Plants | Not Listed | Not Listed | G1G2 | SH | No |
| Pediomelum reverchonii | Reverchon's scurfpea | Plants | Not Listed | Not Listed | G3 | S3 | No |
| Peniocereus greggii var. greggii | desert night-blooming cereus | Plants | Not Listed | Not Listed | G3G4T3 | S2 | No |
| Penstemon alamosensis | Alamo beardtongue | Plants | Not Listed | Not Listed | G3 | S1 | No |
| Penstemon cardinalis var. regalis | royal red penstemon | Plants | Not Listed | Not Listed | G3T3 | S2 | No |
| Penstemon guadalupensis | Guadalupe beardtongue | Plants | Not Listed | Not Listed | G3 | S3 | Yes |
| Penstemon triflorus var. integrifolius | Heller's beardtongue | Plants | Not Listed | Not Listed | G3T2 | S2 | Yes |
| Penstemon triflorus var. triflorus | threeflower penstemon | Plants | Not Listed | Not Listed | G3T3 | S3 | Yes |
| Penstemon wrightii | Wright's beardtongue | Plants | Not Listed | Not Listed | G3G4 | S3 | No |
| Peritoma multicaulis | manystem spiderflower | Plants | Not Listed | Not Listed | G3 | S1 | No |
| Perityle aglossa | limestone rock-daisy | Plants | Not Listed | Not Listed | G3G4 | S3 | No |
| Perityle angustifolia | rayless rock-daisy | Plants | Not Listed | Not Listed | G3G4 | S3S4 | Yes |