Nevada Natural Heritage Program Global (Grank) and State (Srank) Ranks for Threats and/or Vulnerability of Plant Communities:
| G | Global rank indicator, based on worldwide distribution | |
| S | State rank indicator, based on distribution within the state | |
| 1 | Critically imperiled due to extreme rarity, imminent threats, or and/or biological factors | |
| 2 | Imperiled due to rarity and/or other demonstrable factors | |
| 3 | Rare and local throughout its range, or with very restricted range, or otherwise vulnerable to extinction | |
| 4 | Apparently secure, though frequently quite rare in parts of its range, especially at its periphery | |
| 5 | Demonstrably secure, though frequently quite rare in parts of its range, especially at its periphery | |
| P | Potential in the state, but not yet reported or documented | |
| X | Eliminated at the scale indicated (G or S) with no restoration potential, usually due to extinction of a component species | |
| H | Historical occurrence(s) only, presumed eliminated but with restoration potential | |
| ? | Not yet assessed fro rank at the scale indicated (G or S) | |
| U | Unrankable with current data at the scale indicated (G or S) | |
| Q | Taxonomic status Questionable or uncertain | |
| _#_# | Range of uncertainty in a numeric rank (for example, G2G4 or S1S2) | |