Species of Greatest Conservation Need
1124 species
| Scientifc Name | Common Name | Taxonomic Group | Federal Status | State Status | Global Rank | State Rank | Endemic |
|---|---|---|---|---|---|---|---|
| Poa strictiramea | Big Bend bluegrass | Plants | Not Listed | Not Listed | G3 | S1 | No |
| Polanisia erosa ssp. breviglandulosa | South Texas yellow clammyweed | Plants | Not Listed | Not Listed | G5T3T4 | S3S4 | Yes |
| Polemonium pauciflorum ssp. hinckleyi | Hinckley's Jacob's-ladder | Plants | Not Listed | Not Listed | G3G5T2Q | S1 | No |
| Polygonella parksii | Parks' jointweed | Plants | Not Listed | Not Listed | G2 | S2 | Yes |
| Pomaria austrotexana | stinking rushpea | Plants | Not Listed | Not Listed | G3 | S3 | No |
| Pomaria brachycarpa | broadpod rushpea | Plants | Not Listed | Not Listed | G2 | S2 | Yes |
| Potamogeton clystocarpus | Little Aguja pondweed | Plants | E 11/14/1991 |
E 03/30/1993 |
G1 | S1 | Yes |
| Prenanthes barbata | barbed rattlesnake-root | Plants | Not Listed | Not Listed | G3 | S3 | No |
| Prenanthes carrii | canyon rattlesnake-root | Plants | Not Listed | Not Listed | G2 | S2 | Yes |
| Proboscidea sabulosa | dune unicorn-plant | Plants | Not Listed | Not Listed | G3 | S2 | No |
| Proboscidea spicata | many-flowered unicorn-plant | Plants | Not Listed | Not Listed | G1 | S1 | No |
| Prunus havardii | Havard plum | Plants | Not Listed | Not Listed | G3 | S3 | No |
| Prunus minutiflora | Texas almond | Plants | Not Listed | Not Listed | G3G4 | S3S4 | Yes |
| Prunus murrayana | Murray's plum | Plants | Not Listed | Not Listed | G2 | S2 | Yes |
| Prunus texana | Texas peachbush | Plants | Not Listed | Not Listed | G3G4 | S3S4 | Yes |
| Pseudoclappia arenaria | cienega false clappia-bush | Plants | Not Listed | Not Listed | G3 | S3 | No |
| Pseudoclappia watsonii | Watson's false clappia-bush | Plants | Not Listed | Not Listed | G2 | S2 | Yes |
| Pseudognaphalium arizonicum | Arizona cudweed | Plants | Not Listed | Not Listed | G3G4 | S3 | No |
| Pseudognaphalium austrotexanum | South Texas false cudweed | Plants | Not Listed | Not Listed | G3 | S3 | No |
| Psilactis heterocarpa | Welder machaeranthera | Plants | Not Listed | Not Listed | G2G3 | S2S3 | Yes |
| Quercus arkansana | Arkansas oak | Plants | Not Listed | Not Listed | G3 | S1 | No |
| Quercus boyntonii | Boynton's oak | Plants | Not Listed | Not Listed | G1 | SH | No |
| Quercus carmenensis | Sierra del Carmen oak | Plants | Not Listed | Not Listed | G2? | S1 | No |
| Quercus depressipes | Mexican dwarf oak | Plants | Not Listed | Not Listed | G3 | S1 | No |
| Quercus graciliformis | Chisos oak | Plants | Not Listed | Not Listed | G1 | S1 | Yes |